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Добірка наукової літератури з теми "Helopeltis Theivora"

Автор: Grafiati

Опубліковано: 18 травня 2024

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Статті в журналах з теми "Helopeltis Theivora"

Rusli Rustam and Melisa Sep Arianti Simarmata. "UJI EFEKTIVITAS EKSTRAK TEPUNG BUAH SIRIH HUTAN (Piper adumcum L.) UNTUK MENGENDALIKAN Helopeltis theivora." DINAMIKA PERTANIAN 38, no. 1 (August 31, 2022): 51–58. http://dx.doi.org/10.25299/dp.2022.vol38(1).10428.

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The main pest that attacks cocoa crops is Helopeltis theivora Waterhouse. The Helopeltis theivora pest can cause a loss of 60%. Helopeltis theivora pest control generally still uses synthetic chemical insecticides because they can control pests quickly and efficiently. The control using botanical pesticide extracts of forest betel fruit (Piper aduncum L.) is an alternative to overcome the impacts caused by the use of synthetic insecticides. This study aimed to increase the concentration of forest betel powder extract to obtain an effective concentration to control Helopeltis theivora. The research was conducted at the Laboratory of Plant Pests and Experimental Farm, Faculty of Agriculture, Riau University. This study was conducted from August to September 2020. The research used a completely randomized design (CRD) with five treatments and four replications to obtain 24 experimental units. The treatments given were the concentration of forest betel fruit powder extract of 6%, 7%, 8%, 9%, and 10%. The results showed that increasing the concentration could increase the effectiveness of forest betel powder extract (Piper aduncum L.) to control Helopeltis theivora which at a concentration of 8% forest betel flour can cause total mortality of 87,50% with an initial time of death at 9 hours after application and lethal time 50 at 39 hours after application.

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Rusli Rustam and Ice S. Hutagalung. "¬UJI BEBERAPA KONSENTRASI BIJI PINANG (Areca catechu L.) UNTUK MENGENDALIKAN Helopeltis theivora." DINAMIKA PERTANIAN 37, no. 2 (January 17, 2023): 141–48. http://dx.doi.org/10.25299/dp.2021.vol37(2).11867.

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Cocoa (Theobroma cacao L.) is a plantation commodity that plays an important role in Indonesia’s economic activities and is a potential foreign exchange earner. One of the biggest obstacles in growing cacao in Indonesia is the attack of the cocoa pod-sucking pests (Helopeltis theivora Waterhouse). The aim of this study is to obtain an effective concentration of betel nut to control the fruit-sucking pests (Helopeltis theivora Waterhouse) in cocoa plants in the laboratory. The research was conducted at the Plant Pest Laboratory and Experimental farm, Faculty of Agriculture, Riau University from August to October 2020. The treatment given was the administration of areca nut extract with the following concentrations: P0: 0 g.l-1 water, P1: 20 g.l-1 water, P2: 40 g.l-1 water, P3: 60 g.l-1 water, P4: 80 g.l-1 water, P5: 100 g.l-1 water and 20 experimental units were obtained. The results showed that the application of betel nut had a significant effect in controlling cocoa pod sucking pests (Helopeltis theivora Waterhouse). The application of areca nuts extract at a concentration of 60 g.l-1 of water was an effective concentration in controlling Helopeltis theivora Waterhouse with a mortality of 80% with an initial time of death of 10.50 hours after application and lethal time of 50 which is 33.00 hours after application.

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Thube, Shivaji H., Gagana Kumar Mahapatro, Chandrika Mohan, Thava Prakasa Pandian R., Elain Apshara, and Jose C.T. "Biology, feeding and oviposition preference of Helopeltis theivora, with notes on the differential distribution of species of the tea mosquito bug species complex across elevations." Animal Biology 70, no. 1 (2020): 67–79. http://dx.doi.org/10.1163/15707563-20191083.

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Abstract Cocoa (Theobroma cacao L.) is an important beverage crop and commercially grown as a plantation crop. With the changing climate, the tea mosquito bug species complex, viz., Helopeltis theivora, H. bradyi and H. antonii, is emerging as a major threat to cocoa cultivation in India. Among the species of this complex H. theivora is responsible for causing considerable damage. The present investigations were carried out to find a weak link in the life cycle of H. theivora so it can be managed effectively. Specimens of the tea mosquito bug were found to first appear during the first week of September in South India. Helopeltis theivora requires on average 29.28 days to complete its life cycle on cocoa. The highest level of natural mortality was recorded in the first-instar nymph. The total developmental period of the fifth-instar nymph was significantly longer than that for the other nymphal instars. The sex ratio reflects that the population is highly female-biased, which may contribute to the dominant nature of this species in the cocoa ecosystem. Observation of the feeding and oviposition behavior of H. theivora revealed that the insect prefers to feed and oviposit on developing pods rather than on leaves and shoots. Analysis of the species distribution of tea mosquito bug at different elevations revealed that cocoa gardens situated less than 300 meter above mean sea level are dominated by H. theivora, whereas gardens situated more than 300 meter above mean sea level are dominated by H. bradyi. This separation of species across elevation may be driven either by abiotic or biotic factors.

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Ekka, Preety, Lakhi Ram Saikia, and Azariah Babu. "BIO-EFFICACY OF BPA/B7 FORMULATIONS AGAINST HELOPELTIS THEIVORA WATERHOUSE." Journal of Biopesticides 16, no. 1 (June 1, 2023): 63–67. http://dx.doi.org/10.57182/jbiopestic.16.1.63-67.

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Tea garden soil harbors several microorganisms that help in maintaining the crop agro-ecosystem. Some soil microorganisms are beneficial and some may cause harm. The beneficial entomopathogenic fungus (BPA/B7) isolated from Tinsukia (Assam) was found to be more effective against Helopeltis theivora Waterhouse compared to other strains of Beauveria bassiana. This pathogenic fungus has been mass produced and formulated into powder and liquid formulation and its different properties have been screened under laboratory and field conditions and both the formulations were found to be effective against H. theivora.

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SANGITA BORTHAKUR and DIPSIKHA BORA. "Identification of chemical cues of Camellia sinensis (Ericales: Theaceae) and alternate host plants for preference by tea mosquito bug Helopeltis theivora (Hemiptera: Miridae)." International Journal of Science and Research Archive 8, no. 1 (February 28, 2023): 710–19. http://dx.doi.org/10.30574/ijsra.2023.8.1.0123.

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The tea mosquito bug (TMB), Helopeltis theivora (Hemiptera: Miridae) is a polyphagous pest causing serious economic loss in tea plantations of north east India. The push-pull companion cropping system can be used as a component of integrated pest management system to control the pest. We examined the host plant choice of H. theivora for Duranta erecta (Lamiales: Verbenaceae), Senna tora (Fabale: Fabaceae), Lawsonia inermis (Myrtales: Lythraceae), Psidium guajava (Myrtales: Myrtaceae) and Melastoma malabathricum (Myrtales: Melastomataceae) including the primary host, Camellia sinensis (Ericales: Theaceae) using two-choice olfactometric bioassay. The growth index and relative growth index of H. theivora were calculated for different host plants. H. theivora preferred the odor released from the mechanically damaged leaves of C. sinensis and P. guajava. The further study on biochemical constituents of all the host plants reflected the role of soluble sugar, total flavonoids and terpenoids as cues for host preference by H. theivora which indicate a scope for electroantennographic assessment in future. The information generated for P. guajava preference can be utilized in trap cropping or trap formulating approaches for management of H. theivora.

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T, SIVAKUMAR, and YESHWANTH H. M. "Helopeltis theivora (Heteroptera, Miridae) as a pest of betel vine (Piper betle)." Indian Journal of Agricultural Sciences 90, no. 2 (March 16, 2020): 242–43. http://dx.doi.org/10.56093/ijas.v90i2.99053.

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Tea mosquito bug (TMB), Helopeltis theivora Waterhouse (Heteroptera, Miridae) has been recorded for the first time from Kerala, India, as a pest of betel vine (Piper betle L.). Nymphs and adults feed on the tender leaves making it unfit for consumption and sale. Angular water-soaked patches which later appear like shot holes were the symptoms of infestation. Neem oil soap emulsion (0.2%) was effective against the pest. The infested plot was not near tea or cashew plantations, which ruled out the possibility of opportunistic incidence of H. theivora on P. betle. Hence, it is evident that H. theivora has to be reckoned as a pest of betel vine. The current observation on betel vine is important as many of the betel vine growing states in the country are also known for large scale cultivation of tea. Host shift from tea to betel vine and vice versa in these areas may pose a challenge to the production of both the crops. An IPM module with safe organic pesticides has to be developed for contingencies in future.

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BAKAR, SARIPAH BINTI. "Infestations Of Two Major Pests Of Cocoa, Conopomorpha Cramerella and Helopeltis Theivora Under Natural Condition." Pelita Perkebunan (a Coffee and Cocoa Research Journal) 35, no. 3 (January 13, 2020): 186–92. http://dx.doi.org/10.22302/iccri.jur.pelitaperkebunan.v35i3.359.

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The Cocoa pod borer (CPB), Conopomorpha cramerella (Snellen) (Lepidoptera: Gracillariidae) and Helopeltis theivora (Miller) (Hemiptera: Miridae) are the major pests of cocoa in the South East Asian Region. C. cramerella started to infest cocoa pod which more than 7cm in length, whereas H. theivora started to infest the pod at a very early stage of pod development. The present study aims to determine the relationship and the degree of damage severity of these two significant pests under natural condition. No insecticide spraying was carried out throughout sampling occasions; however, other management practices were implemented. Destructive sampling of fifty cocoa pods at various lengths was carried out at fortnightly basis.Percentage of infestation, number of CPB eggs, entry, and exit holes were recorded for an individual pod. The results obtained denoted that H. theivora begin attacking pods at a young age and the majority of the pods were infested when they reached 8 cm in length. The percentage of damage severity increased as the pod developed. In contrast to H. theivora incidence, the number of C. cramerella eggs were recorded higher when the percentage of H. theivora incidences were low. The highest mean number of C. cramerella eggs were recorded when the pod length is more than 150 mm. Although infestation of the C. cramerella was more serious, management of both pests must be started when the pod length is less than 8 cm. Integrated control approaches must be targeted to both pests at the appropriate time, to reduce significant losses.

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K. S., Shilpa, Minimol J. S., Gavas Rakesh, Suma B., Jiji Joseph, Maheswarappa H. P., and Panchami P. S. "Deciphering the role of polyphenol in defence mechanism against tea mosquito bug (Helopeltis theivora Waterhouse.) in cocoa (Theobroma cocoa L.)." PLOS ONE 17, no. 10 (October 14, 2022): e0271432. http://dx.doi.org/10.1371/journal.pone.0271432.

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Tea mosquito bug (TMB) is a serious pest of cocoa whose prevalence is high, mostly during summer and post monsoon season. Three species of tea mosquito bug have been reported on cocoa: Helopeltis antonii Signoret, H. theivora Waterhouse, and H. bradyi Waterhouse. H. theivora is the most prevalent one causing damage to young shoots, cherelles and pods. Rearing of tea mosquito bug on cocoa was found to be a failure in the present study hence Helopeltis theivora Waterhouse was maintained on the alternate host mile-a-minute (Mikania micrantha Kunth) under laboratory condition in insect rearing cages. Using freshly reared tea mosquito bugs twenty cocoa hybrids were screened for resistance and were ranked after 72 hours of screening. All the hybrids having less than three lesions per plant in seedlings and less than 33 lesions on pods were ranked as highly resistant. It was observed that hybrids classified as highly resistant had significantly higher phenol content than those classified as susceptible. The significantly low phenol content in the susceptible hybrids suggests that phenolics have a function in mediating resistance to tea mosquito bug in cocoa. From correlation and regression analysis it is confirmed that phenol content can be used as a potential marker indicating the level of resistance of cocoa hybrids against tea mosquito bug resistance.

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Pancaningtyas, Sulistyani, Ariza Budi Tunjung Sari, and Dwi Suci Rahayu. "DNA Barcoding for Identification of Helopeltis sp. from Kaliwining Experimental Station using Mitochondrial COI Gene." Pelita Perkebunan (a Coffee and Cocoa Research Journal) 38, no. 3 (December 30, 2022): 179–89. http://dx.doi.org/10.22302/iccri.jur.pelitaperkebunan.v38i3.521.

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Helopeltis sp. is one of the major pests of the cocoa plant. Helopeltis can decrease cocoa yield by 50 to 60%. Several species of Helopeltis spp. are still often misidentified due to similarity in morphology such as size and color. This study aimed to identify Helopeltis sp. through DNA barcoding using the mitochondrial cyto- chrome C oxidase subunit 1 (COI) gene. Analysis was carried out on 100 adults Helopeltis sp. from Kaliwining Experimental Station, Indonesian Coffee and Cocoa Research Institute (ICCRI), Jember, Indonesia. Specimens were preserved in 96% ethyl alcohol at 4oC until molecular studies were carried out. PCR amplification was conducted through specific primer from COI gene. Sequences data analysis using MEGA 5.05 software was carried out. The study results using DNA barcoding showed that Helopeltis samples in Kaliwining cocoa plantations are Helopeltis bradyi with a percentage identity above 99% and E value of 0; this sequence as significantly matched. Mean length of the sequences was 679.5 base pairs. Phy- logenetic tree data also shows that the Helopeltis species analysed were also of the same descent, H. bradyi with the accession number KT189562.1. Helopeltis sp. specimens were clustered together. No taxonomic deviation was detected at the species level, indicating that most of the examined species of Helopeltis sp. could be authenticated by the barcode approach using the COI gene. In addi- tion, Helopeltis specimens were also aligned with H. antonii and H. theivora from the genebank to determine their genetic relationship.

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Stonedahl, Gary M. "The Oriental species of Helopeltis (Heteroptera: Miridae): a review of economic literature and guide to identification." Bulletin of Entomological Research 81, no. 4 (December 1991): 465–90. http://dx.doi.org/10.1017/s0007485300032041.

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AbstractThe taxonomy of the Oriental species of Helopeltis is revised and a review of the economic literature is given. An identification key is provided for the 14 recognized species, one of which, H. sulawesi, is described as new. A diagnosis and brief description is given for each species, as well as illustrations of useful taxonomic characters, information on distributions and host records, and a discussion of any known or suspected misidentifications. Lectotype designations are made for 13 nominal species and the following new synonymies are established: H. bradyi Waterhouse = H. ceylonensis De Silva, syn. n and H. romundei Waterhouse, syn. n;H. cinchonae Mann = H. brevicornis Poppius, syn. n.;H. clavifer (Walker) = H. australiae Kirkaldy, syn. n and H. niger Walker, syn. n;H. cuneata Distant = H. elegans Poppius, syn. n;H. fasciaticollis Poppius = H. pallidus Poppius, syn. n and H. pallidiceps Poppius, syn. n;H. theivora Waterhouse = H. oryx Distant, syn. n The somewhat obscure synonymy of H. theobromae Miller under H. theivora is confirmed. Two subgenera are recognized and diagnosed: Afropeltissubgen. n (type species Eucerocoris westwoodi White), including all African species of the genus, and Helopeltis sensu stricto, containing the Oriental and Australasian species.

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Дисертації з теми "Helopeltis Theivora"

Biswas, Rakhee Das. "Studies on multicomponent coordinated defense strategies in tea against foliar fungal pathogens and helopeltis theivora." Thesis, University of North Bengal, 2005. http://hdl.handle.net/123456789/1077.

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Basnet, Kumar. "Enzyme-based detection of pesticide tolerance in the sucking tea pest, helopeltis theivora waterhouse (insecta: heteroptera: miridae) with a study on bio-ecological aspects of its common spider predator from the terai tea plantations of Darjeeling foothills and plains." Thesis, University of North Bengal, 2017. http://hdl.handle.net/123456789/2626.

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Roy, Somnath. "Evolution of the levels of insecticide susceptibility of helopeltis theivora waterhouse (Heteroptera : miridae) and development of an efficacious strategy for management of the pest in dooars tea plantation of North Bengal." Thesis, University of North Bengal, 2008. http://hdl.handle.net/123456789/1563.

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Частини книг з теми "Helopeltis Theivora"

Borthakur, Sangita. ""A Study Concerning Alternate Host Plants Selection by Helopeltis theivora (Waterhouse) (Hemiptera: Miridae"." In Integrated Pest Management Strategies for Sustainable Agriculture. New Delhi Publishers, 2021. http://dx.doi.org/10.30954/ndp/intpest.15.

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