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BIO-EFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST INSECT PESTS OF OKRA (Abelomoschus esculentus L. Moench)

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Title BIO-EFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST INSECT PESTS OF OKRA (Abelomoschus esculentus L. Moench)
 
Creator DEEPAK, S
 
Contributor SHASHI BHUSHAN, V
 
Subject BIO-EFFICACY,DISSIPATION, SELECTIVE, INSECTICIDES, AGAINST, INSECT, PESTS, OKRA, Abelomoschus esculentus L., Moench
 
Description A field experiment was conducted during kharif, 2011 at Students’ Farm, College of
Agriculture, Rajendranagar, Hyderabad to evaluate the efficacy of six insecticides viz.,
bifenthrin 10 EC at 80 g a.i. ha-1, fipronil 5 SC at 500 g a.i. ha-1, flubendiamide 480 SC at
60 g a.i. ha-1, quinalphos 25 EC at 350 g a.i. ha-1, profenofos 50 EC at 400 g a.i. ha-1 and
beta-cyfluthrin 25 SC at 18.75 g a.i. ha-1 against leafhopper (Amrasca biguttula biguttula
Ishida), whitefly (Bemisia tabaci Gennadius) and shoot and fruit borer (Earias vittella
Fabricius) on okra. The dissipation pattern of three effective treatments viz., flubendiamide
480 SC at 60 g a.i. ha-1, profenofos 50 EC at 400 g a.i. ha-1 and beta-cyfluthrin 25 SC at
18.75 g a.i. ha-1 were studied by collecting okra fruits at 0, 1, 3, 5, 7, 10 and 15 days after
last spray and analyzed at AINP on Pesticide Residues, Rajendranagar, Hyderabad.
Among all the insecticides, profenofos (400 g a.i. ha-1) was found to be the most
effective with a maximum reduction in leafhopper population (51.94 %) followed by beta-
cyfluthrin at 18.75 g a.i. ha-1 (50.36 %) and bifenthrin at 80 g a.i. ha-1 (44.43 %) in first
spray, while during second spray, profenofos recorded 68.72 per cent reduction followed
by beta-cyfluthrin (50.72 %) and bifenthrin (44.19 %).
Profenofos (400 g a.i. ha-1) was found to be most effective treatment with a maximum
reduction in whitefly population (57.00 %) followed by bifenthrin at 80 g a.i. ha-1
(54.42 %) and fipronil at 500 g a.i. ha-1 (51.69 %) in first spray, while during second spray,
profenofos and bifenthrin were effective treatments and both recorded reduction of 54.21
per cent followed by fipronil at (50.69 %).
The reduction of shoot and fruit borer damage in okra was low with flubendiamide at
60 g a.i. ha-1 (11.07 % on number basis and 9.20 % on weight basis) followed by beta-
cyfluthrin at 18.75 g a.i. ha-1 (12.80 % on number basis and 13.10 % on weight basis) and
profenofos at 400 g a.i. ha-1 (13.69 % on number basis and 14.20 % on weight basis) in
first spray, while during second spray, flubendiamide found effective with lowest fruit
damage of (14.40 % on number basis and 15.90 % on weight basis) followed by beta-
cyfluthrin (23.40 % on number basis and 20.40 % on weight basis) and profenofos
(24.20 % on number basis and 23.12 % on weight basis).
The initial deposits of flubendiamide at 60 g a.i. ha-1, profenofos at 400 g a.i. ha-1 and
beta-cyfluthin at 18.75 g a.i. ha-1, when sprayed twice at 50 % flowering and repeated ten
days after first spray recorded 1.49, 1.52 and 0.11 mg kg-1, respectively dissipated to below
detectable level (BDL) on 10th, 10th and 5th day, respectively. The half-life worked out for
flubendiamide, profenofos and beta-cyfluthrin were 1.83, 2.16 and 1.13 days with waiting
periods for safe harvest of the okra fruits were 4.19, 5.10 and 2.62 days, respectively.
 
Date 2016-06-29T13:58:07Z
2016-06-29T13:58:07Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68238
 
Language en
 
Relation D9189;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY