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Dissertations / Theses on the topic 'Leaf and Fruit Diseases'

Author: Grafiati

Published: 18 May 2024

Last updated: 31 July 2025

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1

Welker, Robert M. "White apple leafhopper affects apple fruit quality and leaf gas exchange." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06112009-063712/.

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2

Saha, Arnab. "Studies on some leaf and fruit diseases of lagenaria siceraria (Molina) standl and their management." Thesis, University of North Bengal, 2017. http://ir.nbu.ac.in/hdl.handle.net/123456789/2649.

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3

Pretorius, Mathys Cornelius. "Epidemiology and control of Pseudocercospora angolensis fruit and leaf spot disease on citrus in Zimbabwe." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20938.

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Thesis (MScAgric)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Fruit and Leaf Spot Disease (FLSD) of citrus, caused by Phaeoramularia angolensis, is found only in 18 countries in Africa, the Comores Islands in the Indian Ocean and Yemen in the Arabian peninsula. The major citrus export countries in Africa are Morocco, South Africa, Swaziland, and Zimbabwe. Zimbabwe is the only country affected by FLSD. FLSD is a disease of major phytosanitary and economic importance and its devastating effect on citrus is highlighted by the fact that the damage is cosmetic, which renders the fr

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4

Abdurabi, Abdurabi Seif. "Studies of phaeoramularia fruit and leaf spot disease of citrus in Kenya." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259502.

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5

Poulsen, Kristian Wermuth. "Effect of pre-bloom leaf defoliation on cluster morphology and disease pressure." Master's thesis, ISA-UL, 2015. http://hdl.handle.net/10400.5/12214.

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Mestrado Vinifera Euromaster - Instituto Superior de Agronomia - UL<br>Defoliation of grapevines have been shown to impact fruit set and fruit development, although the extent to and timing of which defoliation impacts fruit set and development is still being investigated. This is useful for the purpose of managing crop load and can be a useful tool for disease management. Currently, the understanding is that removal of leaves from the fruiting zone alters the source-sink balance, forcing the grapevine to down-prioritize flowering resulting in reduced fruit set, smaller clusters and less rot (

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6

Call, Robert E., and Michael E. Matheron. "Effective Management Tools for Septoria Leaf Spot of Pistachio in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/220530.

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Septoria leaf spot was detected in the United States for the first time in 1964 within an experimental pistachio planting at Brownwood, Texas. The first observation of the same disease in Arizona pistachio trees did not occur until 1986. In 1988, a survey of the 2,000 acres of pistachio orchards in southeastern Arizona revealed a widespread incidence of the disease. Since the initial discovery of the disease, Septoria leaf spot has appeared annually in some of the Arizona pistachio acreage. The onset and severity of the disease is influenced by summer rainfall that occurs in this region. Disea

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7

Call, Robert E., and Michael E. Matheron. "Fungicidal Performance in Managing Septoria Leaf Spot of Pistachio in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/223845.

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Septoria leaf spot was detected in the United States for the first time in 1964 within an experimental pistachio planting at Brownwood, Texas. The first observation of the same disease in Arizona pistachio trees did not occur until 1986. In 1988, a survey of the 2,000 acres of pistachio orchards in southeastern Arizona revealed a widespread incidence of the disease. Since the initial discovery of the disease, Septoria leaf spot has appeared annually in some Arizona pistachio acreage. The onset and severity of the disease is influenced by summer rainfall that occurs in this region. Pistachio tr

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8

Matheron, Michael E., Michael W. Kilby, and Robert Call. "Effect of Foliar Application of Benomyl on Severity of Septoria Leaf Spot on Pistachio in Southeastern Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/220574.

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The fungicide, benomyl (Benlate) was foliar applied by a commercial air blast sprayer at the rate of 1.0 lb. a.i. per acre in early to late August. Treatments varied with a number of applications i.e. one or two and were compared to an untreated control. Benomyl significantly reduced leaf necrosis surrounding nut clusters and the number of leaf spot lesions when compared to control. One or two applications were equally effective in controlling Septoria leaf spot.

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9

Ndo, Eunice. "Évaluation des facteurs de risque épidémiologique de la phaeoramulariose des agrumes dans les zones humides du Cameroun." Thesis, Montpellier, SupAgro, 2011. http://www.theses.fr/2011NSAM0034/document.

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La phaeoramulariose des agrumes (Pseudocercospora angolensis) attaque les agrumes en Afrique tropicale et constitue une menace pour les autres pays producteurs situés en zone tropicale. La lutte chimique est le seul moyen de lutte efficace contre cette maladie. Cependant, elle est couteuse et néfaste pour l'environnement. La mise en place de stratégies de lutte permettant de minimiser l'emploi de fongicides contre est donc nécessaire. La connaissance des facteurs de risque de la phaeoramulariose est une étape préliminaire à cette démarche. Le travail entrepris avait pour but de préciser, à l'a

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10

Lira, Bruno Silvestre. "Manipulation of leaf senescence and chlorophyll degradation aiming fruit improvement." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-28102017-114118/.

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Leaves are responsible for the majority of the fixed carbon in most plant species. Along leaf development, the photosynthetic capacity increases until the organ reaches maturity. Consequently, at the onset of senescence the leaves have the highest photosynthetic activity, then, as the chloroplasts are dismantled and the photosynthetic machinery is degraded, leaves gradually lose the rate of carbon assimilation. Although the capacity to fix carbon declines as senescence progresses, nutrient remobilization from macromolecule degradation nourishes the developing sink organs. In this regard, delay

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11

Campbell, Richard J. "Canopy light environment influences apple leaf physiology and fruit quality." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39857.

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Several experiments were conducted to determine: the influence of canopy position, girdling, and defoliation on nectar production; whether instantaneous light measurements yield reliable estimates of cumulative seasonal light levels within the canopy; and the effect of the canopy light environment on spur leaf physiology and fruit quality. Defoliation of nongirdled flowering spurs had no effect on nectar production or composition, while defoliation of girdled spurs n~duced nectar sugar concentration by 24%. Canopy position had no influence on nectar production or composition. At full bloom the

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12

Swatsitang, Prasan. "Phenolic antioxidants in fruit." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324103.

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13

Leahy, Marc D. "Impact of early fruit-zone leaf removal on grapevine development and fruit quality in Vitis vinifera Merlot." Master's thesis, ISA/UL, 2012. http://hdl.handle.net/10400.5/8608.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>The objective of this study was to determine the optimal timing of fruit-zone leaf removal for red wine grape cultivars, specifically Vitis vinifera ‘Merlot’, in the Yakima Valley, Washington using four different timings of fruit-zone leaf removal, (i) pre-bloom, (ii) full-bloom, (iii) 3 weeks post-bloom and (iv) no leaf removal (control). Fruit-zone leaf removal is a common canopy management technique, with increasing focus on early (pre-fruit set) timing. Little research exists on the impacts of early fruit-zone leaf removal i

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14

Inoue, Tsuyoshi. "Hesperidin Accumulation during Fruit and Leaf Development in Satsuma Mandarin (Citrus unshiu)." Kyoto University, 2016. http://hdl.handle.net/2433/217182.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第20007号<br>農博第2191号<br>新制||農||1045(附属図書館)<br>学位論文||H28||N5016(農学部図書室)<br>33103<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授本田与一, 教授髙部圭司, 准教授坂本正弘<br>学位規則第4条第1項該当

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15

Campbell, Graham F. (Graham Findlay). "Genetics of pathogenicity in Pyrenophora leaf diseases of barley." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52286.

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Dissertation (PhD(Agric)) -- University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: Net blotch of barley, caused by Pyrenophora teres, is one of the most important diseases of this cereal in the south Western Cape Province of South Africa. This fungus exists as two different types (forms), namely a nettype and a spot-type that are distinguished by differential symptom expression on barley leaves. Based on this specific plant pathological difference a series of studies of agricultural importance were executed to investigate the effects of sexual recombination between these two types. In

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16

Surridge, Angela Karen Joanna. "Fungi associated with banana leaf diseases in South Africa." Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/25782.

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Leaf diseases are an integral part of banana production. While currently not a cause for major concern in South Africa, many of these diseases van reach epidemic proportions and cause severe crop loss. To determine the present status of leaf diseases in South Africa, a survey was conducted in the five banana-growing regions of the country. The study indicated the following: Yello Sigatoka, caused by Mycosphaerella musicola was the most prevalent disease and occurred in all five the regions. Mycosphaerella speckle and Cordana leaf spot, caused by M. musae and Cornana musae respectively, were pr

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17

Dassanayake, E. M. "Studies on virus diseases of Passiflora." Thesis, University of Bath, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327860.

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18

Ferreira, Anton. "Further studies on leaf blackening of proteas." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/2879.

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Thesis (MscAgric (Horticulture))--University of Stellenbosch, 2005.<br>The occurrence of both pre- and postharvest leaf blackening in certain Protea species and cultivars is a problem that severely limits their marketability, vase life and transport options. This research focuses on : (I) The distribution of carbohydrates in inflorescence bearing stems of certain Protea cultivars from harvest, following pulsing with a 10 g.L-1 glucose solution until four weeks postharvest. Stems were held under a variety of postharvest conditions, and (II) The suppression of Protea postharvest leaf blackening

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19

Butler, G. D. Jr, T. J. Henneberry, and J. K. Brown. "Cotton Leaf Crumple Disease of Pima Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/204080.

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20

Behjatnia, Seyyed Ali Akbar. "Characterisation of DNA replication of tomato leaf curl geminivirus /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09ACP/09acpb419.pdf.

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21

Stephens, Iain Andrew. "Leaf blackening of proteas." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/49768.

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Dissertation (PhD (Agric))--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: Leaf blackening is a particular problem limiting vase life and marketability of Protea cut flowers. This research investigated suppression of Protea leaf blackening with a specific focus on Protea cv. Sylvia (P. eximia x P. susannae) cut flowers. Leaf blackening decreased significantly with decreasing storage temperatures m 'Sylvia' proteas and this was attributed to lower respiration rate and conservation of carbohydrate. Low storage temperatures were beneficial in short term handling procedures encounte

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22

Cook, John William. "The effect of foliar applied fertilisers on leaf diseases of cereals." Thesis, Open University, 1998. http://oro.open.ac.uk/57740/.

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The effects of foliar applied urea and potassium chloride on the severity of leaf diseases of cereals were investigated in the laboratory, glasshouse and field between 1992 and 1995. Field studies with urea gave inconsistent results with respect to severity of Erysiphe graminis and consistently increased the leaf area affected by Septaria tritici. However, potassium chloride applied as a foliar spray consistently decreased the leaf area of wheat affected by E. graminis and S. trifid compared with equivalent applications of soil applied fertiliser. Disease control was achieved at early stem ext

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23

Windell, Nicole Elizabeth. "Leaf blackening and the control thereof in selected Protea species and cultivars." Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20396.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Leaf blackening, a postharvest disorder which is characterized by a dark brown to black discoloration, is found in most commercially important Protea cut flower species and cultivars. As this disorder is known to increase with storage time, it is a major concern to the South African industry as the use of sea freight is increasingly preferred due to lower transport costs and a more favourable carbon footprint. The cause of leaf blackening has been strongly linked to a carbohydrate stress exerted by the large infloresce

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24

Moalemiyan, Mitra. "Volatile metabolic profiling to detect and discriminate diseases of mango fruit." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97971.

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Volatile metabolites from headspace gas of mango cultivars Tommy Atkins and Keitt, wounded and inoculated with two pathogens, Colletotrichum gloeosporioides and Lasiodiplodia theobromae or non-inoculated controls were profiled using a GC/MS to develop a technology to discriminate diseases. Several disease discriminatory compounds were identified and classified into three groups: (i) compounds unique to only one treatment; (ii) compounds common to two or more treatments but not to all; and (iii) compounds common to all treatments but with varying in their abundance. 1-pentanol and boronic acid

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25

Platania, Claudia. "New sustainable approaches for control of postharvest diseases of citrus fruit." Doctoral thesis, Università di Catania, 2012. http://hdl.handle.net/10761/1220.

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Injuries sustained by citrus fruit during harvest and postharvest handling and storage allow the entry of wound pathogens, including Penicillium digitatum Sacc (green mold) and P. italicum Wehmer (blue mold), the two major pathogens of citrus fruit being the causal agents of green and blue mold diseases, respectively. Control of these pathogens has classically been conducted with chemical fungicides, but a growing international concern over the often indiscriminate use of synthetic fungicides, the presence of residues in the food and in the environment, as well as the development of fungal res

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26

Wilson, F. Douglas, Judith K. Brown, and G. D. Jr Butler. "Natural Resistance of Cotton to Cotton Leaf Crumple Virus." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/204556.

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Cultivars and germplasm lines of cotton, Gossvpium hirsutum L., differed in response to infection by the cotton leaf crumple virus (CLCV). The most widely grown cultivars in Arizona and southern California, 'Deltapine 90' and 'Deltapine 61', are susceptible, while ' Cedix', developed in El Salvador, and 'Coral', developed in Nicaragua, are highly resistant or immune. Nineteen other lines from a resistance breeding project in Nicaragua showed highly variable responses.

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27

Nadeem, Athar, Zhongguo Xiong, and Merritt Nelson. "Cotton Leaf Curl Virus, A Threat to Arizona Cotton?" College of Agriculture, University of Arizona (Tucson, AZ), 1995. http://hdl.handle.net/10150/210328.

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A serious virus disease of cotton in Pakistan is distantly related to cotton leaf crumple in Arizona. It is much more destructive on cotton than leaf crumple, and has never been found in the western hemisphere. Cotton leaf crumple in Arizona causes only modestly damaging midseason infections, while leaf curl, has had a major impact on the crop in Pakistan. Modern transportation and the increasing movement of living plants in global trade has resulted in them recent introduction of a similar disease of another crop to the western hemisphere.

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28

Brown, J. K., and M. R. Nelson. "Host Range Study of the Cotton Leaf Crumple Virus." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/219771.

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The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers.<br>Cotton leaf crumple (CLC) is incited by a whitefly- transmitted plant virus that infects primarily species within the genus Gossvpium. An extensive host range study was undertaken to identify other hosts which could serve as virus reservoirs in cotton growing areas. More than 20 plant species within the Leguminosae and Malvaceae were identified as CLCV hosts, some of which may be important in the epidemiology of the disease both in cotton and in newly recognized host crop species.

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29

Bartlett, Anna Therese. "Leaf Fiber Strength and Fruit Nutrient Content of Yucca Species Native to the Navajo Nation." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7554.

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The strength of leaf fibers and the nutritional value of the edible fruit of several yucca species native to the U.S. southwest were studied to aid in the determination of species best suited for commercial cultivation by the Navajo Nation. The leaves were softened in an autoclave to facilitate the removal of the leaf matrix, conditioned in environmentally controlled chambers, and the fibers were broken using a texture analyzer. The fibers were frozen and cross sectioned and photographed to determine cross sectional area. Official methods were used to determine the nutritional content of the f

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30

Chalfant, Patricia. "Responses of Grapevines to Timing and Method of Leaf Removal." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337628161.

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31

Uggla, Madeleine. "Domestication of wild roses for fruit production /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a480.pdf.

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32

Mostert, Lizel. "The characterization and control of Phomopsis cane and leaf spot on vine." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51945.

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Thesis (MScAgric.)--Stellenbosch University, 2000.<br>ENGLISH ABSTRACT: Phomopsis cane and leaf spot disease of grapevine is an economically important disease in many of the vine-growing areas of the world. Four different Phomopsis spp. have previously been associated with this disease. The present study investigates the taxonomic significance of the different taxa found on grapevines in South Africa, as well as the endophytic growth and fungicide sensitivity of Phomopsis viticola isolates. The thesis is compiled of several different parts, which deal with specific, but related topics, a

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33

Hickey, Cain C. "Refining Fruit-Zone Leaf Removal for Red-Fruited Bordeaux Grape Varieties Grown in a Humid Environment." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81407.

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Current fruit-zone management recommendation in the eastern US aims for 1-2 basal shoot leaf layers after fruit set to limit fungal disease and sunburn incidence, and prevent extreme heating of grapes. The goal of this work was to assess if fruit-zone leaf removal to an uncommonly greater extent, and/or at an earlier phenological stage, would favorably alter yield components or fruit composition in three popularly grown, red-fruited, Bordeaux varieties – Cabernet franc, Petit Verdot, and Cabernet Sauvignon. Pre-bloom leaf removal to various extents reduced crop yield by 41-78% when compared

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34

Brown, J. K., and M. R. Nelson. "Cotton Leaf Crumple Virus, A Whitefly-Transmitted Geminivirus Cotton in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/204079.

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35

Chen, Lin. "Probing roles of ethylene in leaf gas exchange, growth and development using ACC-deaminase containing rhizobacteria and 1-methylcyclopropene (1-MCP)." Thesis, Lancaster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654943.

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36

Tushemereirwe, W. "Factors influencing the expression of leaf spot diseases of highland bananas in Uganda." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336691.

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37

Wallace, Sara Elizabeth. "Detection and Diagnosis of Red Leaf Diseases of Grapes ( Vitis spp.) in Oklahoma." Thesis, Oklahoma State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10846056.

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<p> The grape industry in Oklahoma was valued at $98 million in 2010. In 2015, symptoms resembling Grapevine Leafroll disease were observed, but Grapevine Leafroll-associated Viruses were not detected using enzyme-linked immunosorbent assay (ELISA). A 2-year Cooperative Agricultural Pest Survey was initiated to determine the etiology of the red leaf symptoms in Oklahoma vineyards. In 2016, a total of 121 symptomatic grapevines from 13 counties were sampled and 96 symptomatic grapevines from 14 counties were sampled in 2017. Each sample was tested for Grapevine Red Blotch Virus (GRBV), <i>Xylel

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38

Abdul, Suleiman Dangana. "Brown rust of wheat : temperature sensitivity, genetic analysis and pathogen variation." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321534.

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39

Butler, G. D. Jr, and J. K. Brown. "Sweetpotato Whitefly Infection of Cotton Leaf Crumple from Weed Hosts in 1984." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/204077.

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40

Olsen, Mary W., Lee Clark, and Hal Moser. "Fungicide Treatment and Varietal Effects on Alternaria Leaf Spot of Pima Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/210386.

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The effect of foliar treatments for prevention of Alternaria leaf spot was evaluated in the field on six varieties of Pima cotton. Disease was significantly reduced by protective sprays of mancozeb and micronized sulfur but not by foliar applications of urea in trials at the University of Arizona Safford Agricultural Center in Safford, AZ. Treatments had no significant effects on yields. Significantly fewer lesions developed on Pima variety UA 4 than on the other varieties. Disease pressure was relatively light, and even though scheduled preventive sprays with mancozeb were effective, fungicid

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41

Pasch, Ludwig Anselm. "The effect of leaf area to crop weight ratios on fruit quality and performance of grapevine (Vitis vinifera cv. Pinot Noir)." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8635.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>Vine performance, fruit and wine composition were investigated on field grown Pinot Noir grapevines subjected to a range of leaf removal and cluster thinning treatments. Both treatments were applied in three levels (25 %, 50 % and 100 % of leaves and clusters retained, respectively) at the phenological stage of pea-size. New emerging leaves were removed as they appeared. Veraison was delayed when leaf area to fruit weight ratio (LA/Y) dropped below a certain threshold (13 cm2 g-1). On the contrary a high LA/Y ratio (> 26 cm

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42

Sharma, Navin K. "Pathogenicity of Phytophthora palmivora (Butl.) Butl. on papaya in vitro." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305628.

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43

Brown, J. K., J. D. Mihail, and M. R. Nelson. "The Effect of Cotton Leaf Crumple on Cotton Inoculated at Different Growth Stages." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/204078.

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44

Van, der Walt Rachel. "Identifying volatile emissions associated with False Codling Moth infested citrus fruit." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020056.

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False codling moth is a known pest of economic importance to many cultivated crops in South Africa and Africa south of the Sahara, and is particularly severe on citrus. If the fruit is infested just before harvest the chances of detecting signs of infestation are very low. As a result, the risk of packaging infested fruit and exporting them as healthy fruit is high. It is therefore a priority to develop a post-harvest technique for detection of False codling moth in citrus fruit at different levels of infestation in order to reduce phytosanitary risk. Compounds released and detected were indic

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45

Nyori, Peter Michael Bulli. "Genetics of resistance to leaf and stripe rust diseases in the spring wheat 'Amadina'." Diss., Kansas State University, 2010. http://hdl.handle.net/2097/4611.

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Doctor of Philosophy<br>Department of Agronomy<br>Allan K. Fritz<br>In this research, a recombinant inbred line (RIL) population derived from cross between a leaf rust- and stripe rust-susceptible spring wheat ‘Avocet S’ and a slow leaf- and stripe-rusting resistant spring wheat ‘Amadina’ was used to postulate and map leaf rust seedling resistance genes, identify quantitative trait loci (QTL) for slow-rusting resistance against leaf and stripe rust, and study slow leaf-rusting components, latent period and infection frequency. Two known Lr genes (Lr23, and Lr26) were identified to be present i

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46

Manley, Aurora Alexandra. "Selection of Hard Red Winter Wheat Lines with Diverse Resistance to Leaf Spot Diseases." Thesis, North Dakota State University, 2016. https://hdl.handle.net/10365/28025.

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Tan spot and Septoria nodorum blotch cause serious yield losses in winter wheat in North Dakota as the majority of commercially grown cultivars are susceptible. This study aimed to identify lines with improved resistance for use as breeding parents. First, advanced NDSU breeding lines and alternative sources of resistance were inoculated with fungal isolates and tested for necrotrophic effector sensitivity. Second, resistant lines were derived from a highly heterogeneous recurrent mass selection F2 population using single seed descent inbreeding coupled with selection for resistance. Finally,

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47

Pfister, Lucas Federico. "Effect of canopy management practices - hedging vs curling shoot tips - on growth, yield and fruit composition of Merlot grapevines." Master's thesis, ISA, 2011. http://hdl.handle.net/10400.5/8583.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>A study to compare the effects of hedging and curling the shoot tips (rolling) on the last wire of the trellising system was carried out in Saint Emilion (France) on Merlot grapevines in 2011. Vines were hedged or curled when shoots were 30 – 40 cm longer than the highest wire. The effects of the two canopy management strategies on vine performance, mainly vegetative growth, disease occurrence, phenology, water status, yield components and berry composition were compared. Curled, not hedged vines presented longer main shoo

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Masciarelli, Stefano. "Effects of different intensity of early leaf removal on vegetative and productive activity and grape quality (cv. Nero d'Avola, Vitis vinifera)." Master's thesis, ISA-UL, 2014. http://hdl.handle.net/10400.5/12219.

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Mestrado Vinifera Euromaster - Instituto Superior de Agronomia - UL<br>The trial wants to study the characteristics of c.v. Nero d’Avola in the Eastern part of Sicily after early leaf removal. Axiom to create high quality wine is to have high quality grapes. This can be possible only with right management of vineyard. The objective is to understand how the early leaf removal can change the productive and vegetative balance of vine and micro-climate of the cluster region. Specifically this research wants to highlight the process that some variables can cause during the leaf out process of t

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Matheron, Michael, Michael Maurer, Dean Bacon, James Truman, and Al Lopez. "Development of Control Measures for Alternaria Fruit Rot on Roanges in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/220552.

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The incidence and severity of Alternaria fruit rot on navel oranges has increased in Maricopa County. The objectives of this study were to test the efficacy of two fungicides, Kocide 101 and Rovral, for disease control and to determine an application schedule that will result in optimum control of disease. In 1994, compared to nontreated trees, a significant reduction in the number of dropped oranges occurred on trees sprayed one to five times with Rovral at monthly intervals from April through August. In the same year, monthly applications of Kocide 101 from April through August were no bette

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Matheson, Michael E., and Joseph C. Matejka. "Sclerotinia Leaf Drop on Lettuce -- Evaluation of New Fungicides for Disease Control." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/214265.

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Leaf drop of lettuce, caused by Sclerotinia sclerotiorum, is a sporadic, but destructive, disease in Arizona. Field trials were established during 1987 and 1988 to evaluate potential new fungicides for disease control. Ronilan and Rovral, the two materials currently registered for use on lettuce for Sclerotinia leaf drop, were consistently among the most effective fungicides for disease control. Levels of disease control equivalent to that provided by Rovral and Ronilan were observed with CGA-449, SC-0854 SDS-65311, Bay HWG 1608, and Spotless. These field tests have identified several potentia

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