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BIOEFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST POD BORER COMPLEX IN PIGEONPEA

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Title BIOEFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST POD BORER COMPLEX IN PIGEONPEA
 
Creator PRIYADARSHINI, G
 
Contributor NARENDRA REDDY, C
 
Subject BIOEFFICACY, DISSIPATION, SELECTIVE, INSECTICIDES, POD, BORER, COMPLEX, PIGEONPEA
 
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.
 
Date 2016-06-29T14:06:06Z
2016-06-29T14:06:06Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68241
 
Language en
 
Relation D9192;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY