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Dissertations / Theses on the topic 'Pesticide resistance'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kazmierczak, Richard Francis. "Pesticide regulatory actions and the development of pest resistance : a dynamic bioeconomic model /." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07132007-143149/.

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2

Akpan, Jude. "Factors Associated with Pesticide Resistance in Culex Mosquitoes." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/6503.

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In recent years mosquito-borne diseases have reemerged, largely because of pesticide resistance. The mosquitoes develop resistance to pesticides because of broad and repeated uses of pesticides. Preventing the development of pesticide resistance requires proper understanding of the environmental factors potentially associated with the development of the resistance. The purpose of this study was to investigate the environmental factors associated with the resistance to pesticides by the Culex mosquitoes. This correlational study included the analysis of archived data samples (N = 29,794) from t

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3

ROTTNER, LOBSTEIN FLORENCE. "Pyrethrinoides : mecanismes d'action et resistance." Strasbourg 1, 1994. http://www.theses.fr/1994STR15003.

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4

Dubbeldam, Aart A. "Fitness costs of pyrethroid resistance in Heliothis virescens." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363656.

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5

Giffard, S. C. "Selection for asulam resistance in barley." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383441.

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6

Schuler, Tanja H. "Laboratory studies on the effect of 'stress' on the susceptibility of the diamond moth (Plutella xylostella) and the rose-grain aphid (Metapolophium dirhodum) to insect pathogens." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262114.

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7

Grbin, Lynne C. "Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management." Title page, table of contents and summary only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phg785.pdf.

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Bibliography: leaves 165-188. This research examines biological and behavioural interactions among the diamond-back moth, Plutella xylostella L. (Lepidoptera: Plutellidae), Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) and the microbial insecticide, Bacillus thuringiensis Berliner. A deterministic simulation model is developed describing the influence of C. plutellae on the evolution of resistance to Bt in a diamond-back moth poulation.

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8

Salmeron, Eloisa. "Subsídios para o manejo da resistência de Blattella germanica (L., 1767) (Dictyoptera: Blattellidae) a inseticidas." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-26072002-151005/.

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Bases para a implementação de um programa de manejo da resistência de Blattella germanica (L.) a inseticidas foram coletadas no presente trabalho. Técnicas de bioensaio de aplicação tópica e de contato tarsal foram comparadas inicialmente para a detecção da resistência a deltametrina e clorpirifós. O bioensaio de aplicação tópica possibilitou uma melhor discriminação entre a linhagem suscetível e as populações de campo de B. germanica testadas. Resultados do monitoramento da suscetibilidade de B. germanica a inseticidas evidenciaram a presença de variabilidade genética que confere resistência

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Konno, Roberto Hiroyuki. "Subsídios para um programa de manejo da resistência de Aphis gossypii Glover, 1877 a inseticidas na cultura do algodão." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-24052005-142415/.

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O objetivo do presente trabalho foi o de coletar informações básicas para a implementação de um programa de manejo da resistência de Aphis gossypii Glover, 1877 a inseticidas na cultura do algodão. Para tanto, foram caracterizadas as linhas-básicas de suscetibilidade de A. gossypii aos inseticidas carbosulfam, tiametoxam e endosulfam por meio de um bioensaio de contato residual. Posteriormente, foi realizado um monitoramento da suscetibilidade a esses inseticidas em populações de A. gossypii que foram coletadas nas regiões de Acreúna-GO, Ituverava-SP, Rondonópolis-MT e Unai-MG nas safras de a

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10

Wooster, Mark T. "Sublethal vapor-induced responses of the German cockroach to commercial pesticide formulations." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54466.

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The overall purpose of this study was to examine the effects of an insecticide vapor pulse on the dispersal response of the German cockroach, Blattella germanica (L). An apparatus was designed to expose test cockroaches to vapors from commercial pesticide formulations. Insecticide vapor-induced dispersal responses were recorded during a two hour period from different strains that had been allowed to acclimate to a harborage. The dispersal response of large nymphs from a pesticide susceptible laboratory strain (VPI) was compared to two propoxur resistant field strains (Carver, Kenly) after exp

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11

Wang, Xin-geng. "Patch exploitation by the parasitoids of Plutella xylostella (L.): from individual behaviour to population dynamics." Title page, contents and summary only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phw2464.pdf.

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Includes bibliographical references (leaves 204-230). Investigates the behaviour and ecology of the two major larval parasitoids of the diamondback moth, Plutella xylostella; Cotesia plutellae and Diadegma semiclausum.

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12

Gall, Valeria Lis Le. "Bases moleculares da resistência a ivermectina em Rhipicephalus (Boophilus) microplus." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/41/41131/tde-06032017-152630/.

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O carrapato do boi Rhipicephalus microplus é um ectoparasita de bovinos de grande importância sanitária e econômica, que produz grandes prejuízos na bovinocultura do Brasil. O uso de ivermectina como meio de controle químico, ao longo dos anos, levou à seleção de linhagens de R. microplus resistentes a ivermectina. A consequência desse processo é a perda da eficácia do acaricida. Este trabalho teve por objetivo determinar as bases moleculares da resistência a ivermectina. Para o estudo dos mecanismos envolvidos na resistência a ivermectina de R. microplus foram utilizadas duas cepas de referên

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13

Kent, Logan. "The effects of salinity and temperature on toxicity of permethrin to pyrethroid-resistant and Wild-type Hyalella azteca." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/theses/2894.

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Global climate change promotes warming temperatures and altered salinities that pose threats to aquatic ecosystems and species, such as Hyalella azteca. Moreover, these threats to aquatic ecosystems are exacerbated by agricultural, urban, and industrial pesticide runoff. In the state of California in 2012, pyrethroid insecticides were the seventh most applied group by licensed professional applicators for pest control and landscape maintenance. Some species, specifically H. azteca have developed non-target resistance to pyrethroids in California. It is imperative to understand whether the bioe

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14

Poletti, Marcelo. "Variabilidades inter e intraespecífica na suscetibilidade de ácaros fitoseídeos (Acari: Phytoseiidae) a Dicofol e Deltametrina em citros." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-28102002-162036/.

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A crescente utilização do controle químico para o manejo de pragas na cultura dos citros tem afetado significativamente a dinâmica populacional de inimigos naturais como os ácaros predadores que são importantes no controle biológico de pragas como o ácaro-da-leprose Brevipalpus phoenicis (Geijskes). Dentro desse contexto, a integração dos controles químico e biológico, seja pela utilização de produtos seletivos ou linhagens de ácaros predadores resistentes a pesticidas, poderia resultar em uma forma de manejo racional de ácaros fitófagos. Sendo assim, a presente pesquisa foi desenvolvida para

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15

Al-Sarar, Ali Saeed. "The impact of the variable flow rate application system on pesticide dose-transfer processes and development of resistance to insecticides in fall armyworm Spodoptera frugiperda (J. E Smith)." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1070933281.

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16

Hill, Catherine Alexandra. ""The mode of action of Bacillus thuringiensis (Berliner) against the sheep louse, Bovicola ovis (Schrank)"." Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phh6449.pdf.

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Bibliography: leaves 120-145. Reports Bt crystal protein toxicity to a phthirapteran species. Although Bt strain WB3516 may produce other unidentified toxins effective against B. ovis, the results provide strong evidence that the [delta]-endotoxin crystal proteins of strain WB3516 significantly contribute to the lousicidal toxicity of this strain.

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17

Cederlund, Harald. "The microbiology of railway tracks : towards a rational use of herbicides on Swedish railways /." Uppsala : Department of Microbiology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200644.pdf.

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18

Schmidt, Fábio Bortoletto. "Linha básica de suscetibilidade de Spodoptera frugiperda (Lepidoptera: Noctuidae) a Lufenuron na cultura do milho." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-04112002-171009/.

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Lufenuron é um novo inseticida do grupo dos inibidores da biossíntese de quitina utilizado para o controle de Spodoptera frugiperda J. E. Smith (Lepidoptera: Noctuidae) na cultura do milho. O uso deste inseticida para o controle de S. frugiperda tem aumentado muito nos últimos anos. Este incremento pode ser atribuído à sua alta eficiência e devido ao desenvolvimento da resistência desta praga aos produtos tradicionalmente recomendados para o seu controle (por exemplo, fosforados e piretróides). Neste trabalho, a linha básica de suscetibilidade de S. frugiperda foi obtida com o intuito de imple

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19

Kazachkova, Nadiya. "Genotype analysis and studies of pyrethroid resistance of the oilseed rape (Brassica napus) insect pest - pollen beetle (Meligethes aeneus) /." Uppsala : Department of Plant Biology and Forest Genetics, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200711.pdf.

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20

Lahóz, André Capelari. "Eficiência agronômica do Etofenprox no controle de Sitophilus zeamais Motsch., 1855 (Coleoptera: Curculionidae) em grãos armazenados de milho e a relação entre o seu ataque e a variação de umidade e atividade de água dos grãos." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-26092008-092930/.

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O gorgulho do milho, Sitophilus zeamais (Motsch., 1855) é a principal praga no armazenamento de milho. Seu controle é feito com a aplicação de inseticidas curativos e ou preventivos, mas o método apresenta inconvenientes relacionados com fatores toxicológicos e de resistência da praga devido ao pequeno número de inseticidas registrados e estes pertencerem a grupos químicos antigos, como os organofosforados e piretróides. Com o objetivo de testar um grupo químico diferente e mais moderno no controle desta praga e analisar a variação de umidade e atividade de água dos grãos de milho no decorrer

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21

Sobrinho, Candido Athayde. "Patossistema caupi X Macrophomina phaseolina: método de detecção em sementes, esporulação e controle do patógeno." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11135/tde-29042005-161211/.

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Apesar da espécie Vigna unguiculata (L.) Walp. ser bastante rústica e estar adaptada às condições adversas de clima e solo brasileiros, seu rendimento é muito baixo. Diversas causas têm sido levantadas para explicar esse comportamento; entre elas destacam-se as doenças fúngicas, sobretudo aquelas cujos patógenos são transmitidos por sementes, em especial a podridão cinzenta do caule, causada por Macrophomina phaseolina (Tassi) Goid. A abordagem analítica desse patossistema revelou alguns problemas emergentes. Entre eles, destacam-se: a) desconhecimento da qualidade sanitária das sement

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22

Andru, Julie. "Les populations invasives de rongeurs en milieu agricole : une étude menée dans des cultures de grande échelle, les plantations de palmiers à huile en Indonésie : Approche paysagère, génétique et écotoxicologique." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00984597.

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Les perturbations environnementales d'origine anthropique favorisent l'établissement de populations invasives. La gestion de ces populations est primordiale pour la santé publique (zoonose, famine), l'environnent (perte de biodiversité), et l'économie (dégâts). L'objectif de cette thèse pluridisciplinaire, menée en conditions naturelles, est d'améliorer les connaissances sur les populations invasives de rongeurs dans des paysages agricoles à grande échelle et d'appréhender les mécanismes d'adaptation qui favorisent une réponse positive aux pressions anthropiques. Les résultats montrent que (1)

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23

Holloway, Jonathan William. "The expression of pyrethroid resistance mechanisms in individual tobacco budworm Heliothis virescens (Fabricius) (Lepidoptera: Noctuidae)." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262575.

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Hussain, Iftikhar. "Susceptibility to anticoagulants and the development of physiological resistance in Rattus norvegicus and Bandicota bengalensis." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241975.

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25

Yehling, Donald M. "Studies on the Fitness Components and Stage Structure of Pesticide-Resistant Tetranychus urticae /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487861396025726.

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26

Cosseboom, Scott D. "Characterization of Botrytis cinerea resistance to fungicides in California strawberry production." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1817.

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Gray mold of strawberry, caused by Botrytis cinerea, is a very destructive pre- and post-harvest fruit rot. Outside of California, fungicide resistance in B. cinerea has been reported to every site-specific chemical class labeled for use against gray mold. One objective of this study was to characterize the resistance of 888 isolates of B. cinerea from California strawberry fields to ten active ingredients. Isolates were collected from the same planting block in 47 fields during the early-season (0 to 8 fungicide applications) and late-season (16 to 26 fungicide applications) of 2016. Sensitiv

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Zink, Olivier. "Identification de l'HPP oxydase d'Arthrobacter globiformis et de la 4-HPA 1-hydroxylase de Pseudomonas acidovorans : étude du métabolisme de la tyrosine par des cellules végétales en utilisant la 13C-RMN." Grenoble 1, 2000. http://www.theses.fr/2000GRE10192.

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Pour obtenir des plantes resistantes aux inhibiteurs de l'hydroxyphenylpyruvate dioxygenase (hppd), nous avons souhaite construire une voie metabolique contournant l'hppd en introduisant les genes codant l'hydroxyphenylpyruvate oxydase (hppo) et la 4-hydroxyphenylacetate 1-hydroxylase. Nous decrivons ici l'identification de trois genes bacteriens codant ces deux activites enzymatiques. - le gene hppo, identifie chez arthrobacter globiformis, code l'hppo (e. C. 1. 2. 3. -) qui catalyse l'oxydation du 4-hydroxyphenylpyruvate en 4-hydroxyphenylacetate (4-hpa). C'est la premiere fois que la protei

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Ahmad, Shakeel. "The impact of pesticides on apple mite communities." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3422565.

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Laboratory, field and semi-field experiments have been carried out on the predatory mites Kampimodromus aberrans, Amblyseius andersoni, Typhlodromus pyri and Phytoseius finitimus in order to optimize biological control strategies against phytophagous mites in apple orchards. The first experiment concerned the augmentative releases of K. aberrans in organic and conventional apple orchards. The most frequent insecticides used in organic orchards were pyrethrins and spinosad, whereas neonicotinoids, OPs and IGRs were used in conventional orchards. K. aberrans releases were successful and predator

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Wimer, Adam Francis. "Resistance evaluation and management of Colorado potato beetle, Leptinotarsa decemlineata (Say), using novel chemistries." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23232.

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Leptinotarsa decemlineata (Say) is the most important defoliating pest of potato Solanum tuberosum L., in North America and Europe. Management of this pest relies heavily on chemical control and insecticide resistance is a persistent problem. This phenomenon has increased the need for developing novel insecticides, resistance evaluation, and the development of alternative control strategies regarding this insect pest. From 2010 to 2013, field and lab experiments were conducted to evaluate the efficacy of a novel insecticide tolfenpyrad on L. decemlineata. In leaf-dip assays, tolfenpyrad wa

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CORSI, BEATRICE. "An alternative to the use of pesticides: chitosan as an elicitor of systemic acquired resistance (SAR) in plants." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2013. http://hdl.handle.net/2108/202033.

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Kiwifruit is a commercial crop threatened by attack of its most dangerous pathogen, Pseudomonas syringae pv. actinidiae (PSA). Currently, the European Economic Community has engaged in a policy of replacing chemical pesticides with natural substances. Following the European trend, this study is dealing with the prevention of disease outbreaks by growing plants able to better resist pathogen infection through the use of chitosan, a biodegradable, well-known elicitor of Systemic Acquired Resistance (SAR). The aim of this work was to improve the quality of Actinidia plants by a sustainable appro

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Seddiki, Nadir. "Import of macromolecules : structural studies of the Pesticin toxin and of an engineered variant." Thesis, Aix-Marseille 2, 2010. http://www.theses.fr/2010AIX22077.

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Chez les bactéries à Gram-négatif, deux systèmes très bien conservés et essentiels à la survie de la cellule bactérienne ont été identifiés : les systèmes Tol et TonB. Ces deux systèmes utilisent la force proton motrice, issue de la membrane interne et transfert l’énergie associée pour le transport actif de molécules (TonB) ou nécessaire au maintien de l’intégrité membranaire (Tol). Ces 2 systèmes ont été détournés de leurs fonctions initiales et parasités par les colicines, leur conférant un rôle primordial dans le mécanisme d’import de la colicine. Une colicine est une bactériocine (toxine)

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Yuh, Joannes Petrus. "Effect of Pesticides on Salicylic Acid Binding Protein 2 (SABP2) and Plant Defense." Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etd/2259.

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Tobacco SABP2 has been shown to display high affinity for salicylic acid (SA) and methylsalicylate (MeSA) and plays an important role in SAR signal development. Using biochemical approach, SABP2 has been shown to demonstrate strong esterase activity in converting MeSA to SA. Recent study shows that tetra fluoroacetophenone, a synthetic analog of SA, competitively inhibits SABP2 esterase activity as well as suppresses SAR signal development in tobacco mosaic virus (TMV)-infected tobacco plants. Not much has been studied on the effect of pesticides on plant defenses. Because both AChE and SABP2

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Oliveira, Fábio Eduardo Bueno. "Suscetibilidade de Spodoptera frugiperda (Lepidoptera: Noctuidae) a metaflumizone na cultura do milho: bases para o manejo da resistência." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-14102008-103838/.

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Metaflumizone é um novo inseticida, pertencente ao novo grupo químico semicarbazone, com excelente atividade no controle de várias espécies da Ordem Lepidoptera. O produto atua no sistema nervoso dos insetos bloqueando os canais de sódio sem a necessidade de ativação metabólica, ou seja, a molécula é tóxica em sua forma original. O mecanismo de ação de metaflumizone é distinto dos inseticidas piretróides que atuam como moduladores de canais de sódio. Para conhecer a atividade de metaflumizone sobre Spodoptera frugiperda (J.E. Smith) e estabelecer estratégias proativas de manejo da resistência

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Poletti, Marcelo. "Integração das estratégias de controle químico e biológico para a conservação e liberação dos ácaros predadores Neoseiulus californicus (McGregor) e Phytoseiulus macropilis (Banks) (Acari: Phytoseiidae) em programas de manejo do ácaro rajado Tetranychus urticae Koch (Acari: Tetranychidae)." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-11052007-152134/.

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A exploração de ácaros predadores no manejo de ácaros fitófagos em sistemas de produção agrícola pode ser prejudicada pelo uso de agrotóxicos para o controle de outras pragas e doenças. O uso de produtos compatíveis com os ácaros predadores ou de linhagens de ácaros predadores resistentes a agrotóxicos pode favorecer a conservação desses inimigos naturais. Uma outra estratégia a ser explorada pode ser a liberação isolada ou combinada de ácaros predadores com hábitos alimentares e comportamentais distintos. Dentro desse contexto, o presente trabalho foi desenvolvido para coletar subsídios para

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Tirello, Paola. "Effetti dei prodotti fitosanitari sulle comunità di acari della vite Effects of pesticides on mite communities of grapes." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3423328.

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The present study deals with the effect of pesticides on grape mites, with particular emphasis on predatory mites belonging to the family Phytoseiidae. This study comprises experiments carried out in laboratory and in open field. The main results are summarized below. Resistance to acaricides in Tetranychus urticae populations from Italy The two-spotted spider mite Tetranychus urticae was selected as study model. We conducted toxicological tests to assess the acute toxicity of several insecticides and acaricides on different spider mite populations. During these tests, resistance to acari

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Silva, Leonardo Dantas da. "SubsÃdios para monitoramento e manejo da resistÃncia de Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) a inseticidas." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1402.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>O uso de inseticidas tem sido a principal estratÃgia de controle da mosca-branca, Bemisia tabaci (Gennadius). O uso intensivo desses produtos tem levado ao aparecimento de problemas de resistÃncia da mosca-branca aos mesmos em todo o mundo. Devido Ã carÃncia de estudos nessa Ãrea no Brasil, os objetivos desta pesquisa foram: validar uma tÃcnica de bioensaio para a caracterizaÃÃo de linhas-bÃsicas de suscetibilidade de B. tabaci a inseticidas e verificar a variabilidade genÃtica de populaÃÃes de B. tabaci quanto Ã suscetibilidade

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Guzzo, Élio César. "Seleção de genótipos de feijoeiro Phaseolus vulgaris (L.) (Leguminosae) resistentes aos carunchos Acanthoscelides obtectus (Boh.) e Zabrotes subfasciatus (Say) (Coleoptera: Bruchidae) e o seu uso associado com inseticidas botânicos." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-16072008-131053/.

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Este estudo foi realizado com o objetivo de identificar genótipos de feijão Phaseolus vulgaris resistentes aos carunchos Acanthoscelides obtectus e Zabrotes subfasciatus, bem como avaliar o efeito associado desses genótipos resistentes com inseticidas de origem vegetal. Para tanto, foram utilizados acessos de P. vulgaris do Banco de Germoplasma do Instituto Agronômico de Campinas e inseticidas comerciais de origem botânica. No screening inicial, amostras dos genótipos foram infestadas com cada uma das espécies de bruquídeos separadamente, avaliando-se o número de insetos emergidos aos 50 dias

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Teixeira, Andreia Filipa Rodrigues Simão. "Valorisation of vegetable oil deodorizer distillate by enzymatic reaction and membrane processing." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/12044.

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Sangwan, Jagbinder Singh. "Obtention in vitro de cellules puis de plantes résistantes a certains herbicides chez le datura innoxia mill. Et le nicotania tabacum l." Paris 7, 1988. http://www.theses.fr/1988PA077149.

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La mise au point d'un système pour la sélection in vitro de deux solanacées diploïdes et autogames résistantes a l'atrazine, au chlortoluron et au terbutryne, est décrite. Les effets de ces produits ont été détermines sur des cultures d'organes (explants différencies) et sur des cals (tissus indifférencies). Aucune sélection n'est possible a partir de disques foliaires, entre-nœuds, anthères et cals non chlorophylliens. On procede ensuite au repiquage des tissus sur un milieu organogène. On réalise le micro greffage des apex des tiges ainsi formées sur de jeunes plantes issues de germination.

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Schaller, Hubert. "Selection in vitro et caracterisation de mutants de nicotiana tabacum l. Resistant a des pesticides (de type n-alkyl-morpholine ou triazole) inhibiteurs de la biosynthese des sterols." Université Louis Pasteur (Strasbourg) (1971-2008), 1992. http://www.theses.fr/1992STR13121.

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Une strategie de mutagenese-selection de cultures de protoplastes de tabac a permis d'obtenir des cals resistant a des pesticides de type n-alkyl-morpholine ou triazole, inhibiteurs de la biosynthese des sterols. Les differentes classes de cals resistants, discrimines en fonction de leur composition sterolique, suggerent l'existence de plusieurs mecanismes de resistance a ces pesticides, mettant en jeu soit une modification de la voie des sterols, soit des modifications dans d'autres voies metaboliques. En particulier, un mutant surproducteur de sterols a ete caracterise. L'analyse genetique m

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Rodrigues, Marco Antonio Tavares 1961. "Classificação de fungicidas de acordo com o mecanismo de ação proposto pelo FRAC /." Botucatu : [s.n.], 2006. http://hdl.handle.net/11449/97224.

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Resumo: Os fungicidas agrícolas consistem num componente importante da produção agrícola, exercendo papel primordial principalmente no momento em que os demais métodos de controle mostram-se ineficientes. Sua intensa utilização vem provocando um sério problema, que é a resistência dos fungos a alguns princípios ativos utilizados. Quando se utilizam os fungicidas em um programa de manejo de doenças, é muito importante o conhecimento do mecanismo de ação das moléculas utilizadas, visando evitar erros que podem comprometer sua vida útil e, em alguns casos, gerar situações de difícil resolução com

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Rodrigues, Marco Antonio Tavares [UNESP]. "Classificação de fungicidas de acordo com o mecanismo de ação proposto pelo FRAC." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/97224.

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Made available in DSpace on 2014-06-11T19:28:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-01-13Bitstream added on 2014-06-13T20:37:49Z : No. of bitstreams: 1 rodrigues_mat_me_botfca.pdf: 1701093 bytes, checksum: a0f9979d96649f11849b3f734c7eb846 (MD5)<br>Os fungicidas agrícolas consistem num componente importante da produção agrícola, exercendo papel primordial principalmente no momento em que os demais métodos de controle mostram-se ineficientes. Sua intensa utilização vem provocando um sério problema, que é a resistência dos fungos a alguns princípios ativos utilizados. Quando

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43

Boyer, Sébastien. "Résistance Métabolique des Larves de Moustiques aux Insecticides : Conséquences Environnementales." Phd thesis, Université Joseph Fourier (Grenoble), 2006. http://tel.archives-ouvertes.fr/tel-00571172.

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Dans un contexte de lutte intégrée contre les moustiques, l'Entente Interdépartementale pour la Démoustication (E.I.D. Ain, Isère, Rhône, Savoie Rhône-Alpes s'est tournée vers une lutte totalement biologique (Bti) pour lutter contre les moustiques. Mon sujet de thèse s'inscrit dans la suite d'une collaboration scientifique constante depuis 40 ans entre l'E.I.D. et le laboratoire de recherche dans lequel j'ai effectué ma thèse. Cet organisme de gestion utilise le Bti depuis 20 ans. Et bien qu'à ce jour, aucune population de moustique ne soit apparue résistante au Bti, ce gestionnaire s'interrog

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Faucon, Frédéric. "Etude des mécanismes de résistance du moustique Aedes aegypti aux insecticides pyréthrinoïdes : Apports des nouvelles technologies de séquençage ADN à l’identification de nouveaux marqueurs de résistance." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAV027/document.

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La résistance des moustiques aux insecticides pyréthrinoïdes (PYRs) menace les programmes de lutte anti-vectorielle à l'échelle mondiale. Chez le moustique Aedes aegypti, vecteur de la dengue et du Chikungunya, les principaux mécanismes causant cette résistance ont été identifiés. La résistance métabolique joue alors un rôle important et consiste en une biodégradation accrue de l'insecticide par des enzymes de détoxication. Néanmoins, les bases moléculaires de ce mécanisme restent méconnues. La plupart des gènes impliqués dans la résistance métabolique aux PYRs ont été identifiés par des appro

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Maia, Aline de Holanda Nunes. "Modelagem da evolução da resistência de pragas a toxinas Bt expressas em culturas transgênicas: quantificação de risco utilizando análise de incertezas." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-19012004-100211/.

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Um dos principais riscos associados às culturas inseticidas que expressam toxinas da bactéria Bacillus thuringiensis (Bt) é a evolução de resistência em pragas alvo, processo governado por fatores genéticos e bioecológicos que se inter-relacionam. Um dos parâmetros chave que influenciam a evolução de resistência é a freqüência inicial do alelo de resistência na população da praga alvo (FreqInicial). Devido à complexidade desse processo, experimentos para estudar sua evolução em larga escala são praticamente impossíveis. Modelos matemáticos de simulação têm sido utilizados para estimar a

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Boaria, Andrea. "Biological and integrated control of Frankliniella occidentalis (Pergande) on ornamentals in the northeastern Italy." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423799.

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Laboratory, semi-field and field experiments were conducted with the aim of identifying biological and integrated control strategies to be applied against Frankliniella occidentalis. We studied the spatial and temporal distribution of the main thrips pests in greenhouses and potential antagonists in some greenhouses characterized by a different level of lateral openings and a rose garden in the open. The second experiment was planned to show that opening greenhouse structures are not automatically related to an increase in thrips problems on ornamental crops. The third experimental study has b

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Dunley, John E. "Genetics and gene flow of organophosphate resistance in three predatory mites, Amblyseius andersoni Chant, Typhlodromus pyri Scheuten and Metaseiulus occidentalis Nesbitt (Acarina: Phytoseiidae), in Oregon." Thesis, 1993. http://hdl.handle.net/1957/36358.

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Genetics, gene flow, and distribution of pesticide resistance traits were examined for organophosphate (OP) resistance in three beneficial phytoseiid mites. Levels and genetics of OP resistance in Amblyseius andersoni were examined first. Laboratory strains from Italy and Oregon, USA, were compared in susceptibility to insecticides used in western Oregon fruit crops. The Italian strain was 80-100 times more resistant to the OPs azinphosmethyl, diazinon, malathion, and phosalone, as well as carbaryl, a carbamate. Significant differences were not found between strains for endosulfan or fenvalera

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Gouamene, Lamine Christiane N. "Biochemical factors of resistance and management of Colorado potato beetle, Leptinotarsa decemlineata (Say), (Coleoptera: Chrysomelidae)." 1994. https://scholarworks.umass.edu/theses/3061.

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Scheck, Heather J. "Copper and streptomycin resistance in Pseudomonas syringae isolated from Pacific Northwest nurseries." Thesis, 1997. http://hdl.handle.net/1957/33958.

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Grbin, Lynne C. "Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management / by Lynne Grbin." Thesis, 1997. http://hdl.handle.net/2440/19046.

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Bibliography: leaves 165-188.<br>ix, 188 leaves, [2] leaves of plates : ill. (some col.) ; 30 cm.<br>This research examines biological and behavioural interactions among the diamond-back moth, Plutella xylostella L. (Lepidoptera: Plutellidae), Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) and the microbial insecticide, Bacillus thuringiensis Berliner. A deterministic simulation model is developed describing the influence of C. plutellae on the evolution of resistance to Bt in a diamond-back moth poulation.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1998

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