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Studies on the efficacy of some botanical and chemical insecticides against thrips, Thrips tabaci (Lindeman) on onion

KrishiKosh

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Title Studies on the efficacy of some botanical and chemical insecticides against thrips, Thrips tabaci (Lindeman) on onion
 
Creator Garg, Ruby
 
Contributor Yadav, G.S.
 
Subject Pesticides, Onions, Extraction, Insecticides, Vegetables, Garlic, Crops, Fruits, Land resources, Thrips tabaci
 
Description A field experiment was carried out during winter season of 2011-12 at the Research
Area of Department of Vegetable Sciences, CCS, Haryana Agricultural University, Hisar to
evaluate the bioefficacy of chemical insecticides viz. cypermethrin, fenvalerate, lambdacyhalothrin @ 37.5 g a.i. ha
-1
and malathion @ 375 g a.i. ha
-1
and botanical insecticides viz.
NSKE (5 and 10 %) and garlic extract (5 and 10 %) on onion var. Hisar-2. The first
application of each insecticide was done 72 days after transplanting followed by second
application after 10 days. All the treatments were significantly better than the control. The
thrips population reduction (%) varied from 18.66 to 82 after two consequent sprays with
highest in cypermethrin. Cypermethrin, fenvalerate and lambda-cyhalothrin were at par with
each other. Botanicals were significantly less effective over control.
Application of two synthetic pyrethroids viz., cypermethrin and fenvalerate @ 37.5 g
a.i. ha
-11
was done on onion and the residues were determined on/ in bulbs and leaves 0.3.7.
10 and at harvest at different time intervals. The average residues of cypermethrin @ 37.5 g
a.i. ha
-1
in the onion leaves were 0.19 and 0.12 mg/ kg on 0 and 3 DAS, respectively, which
were above ADI of 0.05 mg kg
-1
and got reduced to 0.05 mg kg
-1
on 7 DAS. Average residues
of 0.03 mg kg
-1
as recorded in the onion bulbs on zero day in cypermethrin which was below
ADI. Washing of onion leaves reduced residues of cypermethrin to 52 % whereas peeling
reduced the residues to an extent of 83 % on bulbs at 0 day. The average residues of
fenvalerate on onion leaves and bulbs on 3 DAS were 0.1 mg kg
-1
and 0.02 mg kg
-1
respectively.
 
Date 2016-10-07T09:00:20Z
2016-10-07T09:00:20Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80196
 
Language en
 
Format application/pdf
 
Publisher CCSHAU