Determination of economic injury levels of &lt;i&gt;Helicoverpa armigera&lt;/i&gt; (Hubner) in chickpea

Zahid, MA; Islam, M. J.; Reza, MH; Prodhan, M. Asaduzzaman; Begum, M Rumana

doi:10.3329/bjar.v33i4.2288

“…For example, Cydia ptychora (Meyrick) at a population of 0.45 larvae per soybean plant (Abhilash and Patil, 2010) and H. armigera (Hübner) population below 0.79 larvae per plant achieved excellent control in pigeon pea (Reddy et al, 2001). Based on unit crop area, estimated EIL and ETL for H. armigera on chickpea for two years at 1.2 and 0.95, and 0.9 and 0.73 larva per meter row, respectively, were found effective (Zahid et al, 2008). Likewise, EIL and fixed ETL for Anarsia lineatella at112 and 84 larvae per sampling unit, respectively, on Prunus persica also served the purpose of effective population management well below economic loss stage (Damos and Savopoulou-Soultani, 2010).…”

Section: Introductionmentioning

confidence: 92%

Plant Diversity and Phylogenetic Community Structure Along Environmental Gradients in a Temperate Forest, South Korea

2020

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Spotted bollworm, Earias vittella Fab. (Lepidoptera: Noctuidae), is a serious insect pest of cotton that reduces crop yield and deteriorates lint quality. Field experiments were conducted at the Central Cotton Research Institute, Multan, Pakistan for two consecutive years (2009 and 2010) to estimate economic injury level (EIL) and economic threshold level (ETL). For economic analyses, gain threshold (GT) and benefit-cost ratio (BCR) were assessed by spraying cypermethrin, deltamethrin and spinosad at four thresholds levels (0, 3, 5 and 7% damage) and compared with unsprayed treatment (control) for a long and a short duration cotton genotype. The numbers of damaged fruits were almost similar while larval populations and the numbers of healthy fruits were different between the two genotypes. Insecticides applications at selected percent damage levels kept E. vittella larval infestation and bolls damage well below from the total fruit losses of 60-74% in unsprayed treatment. Increase in percent damage levels decreased the cost of protection (CP) and the net monetary profit (NMP). ETL for long duration genotype (CIM-496) is suggested at 5% damage level with a larval population of 1.12-1.22 larvae per 25 plants (GT basis) and 4.5 larvae per 25 plants (BCR basis). For short duration genotype (CIM-506), ETL at 3% damage level with larval population of 1.4-1.33 larvae per 25 plants and 3.3 to 3.9 larvae per 25 plants on GT and BCR basis, respectively is recommended. Timely application of insecticides at ETLs is suggested as economical mean for an effective control of E. vittella on cotton crop.

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“…In this study, ETL was fixed at 75% of the EILs following the findings of Higley and Pedigo (1993), Kovanci et al (2005), Zahid et al (2008)and Damos and Savopoulou-Soultani (2010).…”

Section: And Fig 2 Etl = 75% Of Eilsmentioning

confidence: 99%

Economic Analyses, Injury Levels and Thresholds for Effective Management of Earias Vittella (Fab.) on Gossypium Hirsutum

2020

THE JAPS

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Spotted bollworm, Earias vittella Fab. (Lepidoptera: Noctuidae), is a serious insect pest of cotton that reduces crop yield and deteriorates lint quality. Field experiments were conducted at the Central Cotton Research Institute, Multan, Pakistan for two consecutive years (2009 and 2010) to estimate economic injury level (EIL) and economic threshold level (ETL). For economic analyses, gain threshold (GT) and benefit-cost ratio (BCR) were assessed by spraying cypermethrin, deltamethrin and spinosad at four thresholds levels (0, 3, 5 and 7% damage) and compared with unsprayed treatment (control) for a long and a short duration cotton genotype. The numbers of damaged fruits were almost similar while larval populations and the numbers of healthy fruits were different between the two genotypes. Insecticides applications at selected percent damage levels kept E. vittella larval infestation and bolls damage well below from the total fruit losses of 60-74% in unsprayed treatment. Increase in percent damage levels decreased the cost of protection (CP) and the net monetary profit (NMP). ETL for long duration genotype (CIM-496) is suggested at 5% damage level with a larval population of 1.12-1.22 larvae per 25 plants (GT basis) and 4.5 larvae per 25 plants (BCR basis). For short duration genotype (CIM-506), ETL at 3% damage level with larval population of 1.4-1.33 larvae per 25 plants and 3.3 to 3.9 larvae per 25 plants on GT and BCR basis, respectively is recommended. Timely application of insecticides at ETLs is suggested as economical mean for an effective control of E. vittella on cotton crop.

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“…At harvest, the tuber weight per plot were recorded as evidence of yield components. Appraisal of potato tubers loss percentages due to infestation with both was calculated according to the following that modified from the formula described by Zahid et al, (2008): % loss percent = [(Yop -Yt2…5 / Yop) x 100], Where: -Yop = optimal yield. Yt2... 5 = yield for each insecticidal treatment.…”

Section: -Yield Loss Assessmentmentioning

confidence: 99%

Yield Losses of Potato Tubers due to Infestation with Gryllotalpa gryllotalpa (Gryllotalpidae: Orthoptera) and Penitodon bispinosus (Scarabaeidae: Coleopteran) Based on Insecticide Treatment at Nubaria Region, Egypt

2017

Alexandria Science Exchange Journal: An International Quarterly

1

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The present investigation has been conducted in the two successive summer seasons of 2014 followed by the winter one of 2015, for the purpose of appraising yield losses to potato tubers caused by the two key subterranean insect pests: Gryllotalpa gryllotalpa(L), Penitodon bispinosus Kust Potato plants were treated with two recommended doses of seven insecticidal baits at 70 and 85 days from sowing. These poisonous baits were Fipronil, Chloropyrifos methyl, Fentrothion, Dimethoate, Azadirachtin, Bacillus thuringiensis and Beauveria bassiana.

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Determination of economic injury levels of <i>Helicoverpa armigera</i> (Hubner) in chickpea

Cited by 20 publications

References 1 publication

Plant Diversity and Phylogenetic Community Structure Along Environmental Gradients in a Temperate Forest, South Korea

Plant Diversity and Phylogenetic Community Structure Along Environmental Gradients in a Temperate Forest, South Korea

Economic Analyses, Injury Levels and Thresholds for Effective Management of Earias Vittella (Fab.) on Gossypium Hirsutum

Yield Losses of Potato Tubers due to Infestation with Gryllotalpa gryllotalpa (Gryllotalpidae: Orthoptera) and Penitodon bispinosus (Scarabaeidae: Coleopteran) Based on Insecticide Treatment at Nubaria Region, Egypt

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