BIOEFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST POD BORER COMPLEX IN PIGEONPEA
KrishiKosh
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Title |
BIOEFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST POD BORER COMPLEX IN PIGEONPEA
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Creator |
PRIYADARSHINI, G
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Contributor |
NARENDRA REDDY, C
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Subject |
BIOEFFICACY, DISSIPATION, SELECTIVE, INSECTICIDES, POD, BORER, COMPLEX, PIGEONPEA
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Description |
A field experiment was carried out during kharif, 2011-12 at Student’s Farm, College of Agriculture, Rajendranagar, Hyderabad wherein the bioefficacy of six insecticides viz., lambda-cyhalothrin 5 EC at 25 g a.i. ha -1, beta-cyfluthrin 25 SC at 18.80 g a.i. ha -1, thiacloprid 240 SC at 120 g a.i. ha -1, flubendiamide 480 SC at 60 g a.i. ha -1, dimethoate 30 EC at 300 g a.i. ha-1 and quinalphos 25 EC at 250 g a.i. ha -1 was evaluated against pod borer complex viz., gram pod borer (Helicoverpa armigera Hubner), pod fly (Melanagromyza obtusa Malloch), flower webber cum borer (Maruca vitrata Geyer), and plume moth (Exelastis atomosa Walsingham) on pigeonpea. The dissipation pattern of three effective treatments viz., flubendiamide 480 SC at 60 g a.i. ha -1, lambda-cyhalothrin 5 EC at 25 g a.i. ha-1 and beta-cyfluthrin 25 SC at 18.80 g a.i. ha -1 was studied by collecting pigeonpea green pod samples at 0, 1, 3, 5, 7, 10 and 15 days after second spray and dry pods at harvest at AINP on Pesticide Residues, Extension Education Institute premises, Rajendranagar, Hyderabad. Among all the chemicals, flubendiamide 480 SC at 60 g a.i. ha-1 was found to be the most effective with a maximum reduction in lepidopteran pod borers with pod damage, grain damage and weight loss of 5.33, 3.28 and 2.89 per cent, respectively followed by lambda-cyhalothrin 5 EC at 25 g a.i. ha-1 (8.00, 3.37 and 2.95%) and beta-cyfluthrin 25 SC at 18.80 g a.i. ha-1 (10.33, 6.37 and 5.62%), respectively. Lambda-cyhalothrin 5 EC at 25 g a.i. ha-1 was found to be the most effective with a maximum reduction in pod fly grain damage and weight loss of 1.97 and 1.23 per cent respectively followed by beta-cyfluthrin 25 SC at 18.80 g a.i. ha-1 (3.40 and 2.75%) and flubendiamide 480 SC at 60 g a.i. ha-1 (3.94 and 2.41%), respectively. Flubendiamide at 60 g a.i. ha-1 exhibited highest yield by recording 1639 kg ha -1 followed by lambda-cyhalothrin at 25 g a.i. ha-1 (1401 kg ha-1) and beta-cyfluthrin at 18.80 g a.i. ha-1 (1375 kg ha-1). Highest incremental cost benefit ratio (ICBR) was realized with the treatment lambda-cyhalothrin at 25 g a.i. ha-1 (1:7.54) followed by beta-cyfluthrin at 18.80 g a.i. ha-1 (1:4.69) and quinalphos 250 g a.i. ha -1 (1:4.39). The intial deposits of flubendiamide, lambda-cyhalothrin and beta-cyfluthrin were 1.47, 1.07 and 0.12 mg kg-1 respectively dissipated to below detectable levels at 10, 7 and 5 days respectively. The half life values of flubendiamide, lambda-cyhalothrin and beta- cyfluthrin were 1.56, 1.59 and 1.84 days respectively while waiting periods were 3.24, 5.59 and 3.01 days respectively. Pigeonpea grains at harvest were free from the residues of flubendiamide, lambda-cyhalothrin and beta-cyfluthrin. |
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Date |
2016-06-29T14:06:06Z
2016-06-29T14:06:06Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/68241
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Language |
en
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Relation |
D9192;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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