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
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Creator |
Garg, Ruby
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Contributor |
Yadav, G.S.
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Subject |
Pesticides, Onions, Extraction, Insecticides, Vegetables, Garlic, Crops, Fruits, Land resources, Thrips tabaci
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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. |
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Date |
2016-10-07T09:00:20Z
2016-10-07T09:00:20Z 2015 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/80196
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Language |
en
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Format |
application/pdf
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Publisher |
CCSHAU
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