EFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST PEST COMPLEX OF LUCERNE (Medicago sativa L.)
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Title |
EFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST PEST COMPLEX OF LUCERNE (Medicago sativa L.)
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Creator |
PREMALATHA, G
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Contributor |
CHIRANJEEVI, CH
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Subject |
EFFICACY, DISSIPATION, SELECTIVE, INSECTICIDES, PEST, COMPLEX, LUCERNE
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Description |
Field experiment was carried out during Rabi, 2011-12 at Student’s Farm, College of Agriculture, Rajendranagar, Hyderabad wherein the efficacy of six insecticides viz., thiacloprid 240 SC at 120 g a.i. ha-1, spirotetramat 240 SC at 120 g a.i. ha-1, imidacloprid 240 SC at 200 g a.i. ha-1, dimethoate 30 EC at 300 g a.i. ha-1, bifenthrin 10 EC at 80 g a.i. ha-1 and quinalphos 25 EC at 350 g a.i. ha-1 were evaluated against aphids i.e., pea aphid, Acyrthosiphon pisum Harris, spotted alfalfa aphid Therioaphis trifolii F., and leaf miner, Agromyza frontella Rondani on lucerne. The dissipation pattern of three effective treatments viz., spirotetramat 240 SC at 120 g a.i. ha-1, thiacloprid 240 SC at 120 g a.i. ha-1 and imidacloprid 240 SC at 200 g a.i. ha-1 was studied by collecting lucerne samples including leaves, stem and flowers at 0, 1, 3, 5, 7, 10 and 15 days after spraying, respectively and analyzed at AINP on Pesticide Residues, Extension Education Institute premises, Rajendranagar, Hyderabad. Among the insecticides tested, spirotetramat (120 g a.i. ha-1) was found the best and effective treatment in controlling pea aphid, A. pisum population with highest overall mean per cent reduction of 89.28, followed by thiacloprid at 120 g a.i. ha-1 (83.85%) and imidacloprid at 200 g a.i. ha-1 (82.32%), respectively. Spirotetramat (120 g a.i. ha-`1) also proved as the best treatment in reducing the spotted alfalfa aphid, T. trifolii population recording highest overall mean per cent reduction of 90.70 followed by thiacloprid at 120 g a.i. ha-1 (86.66%) and imidacloprid at 200 g a.i. ha-1 (84.27%). The overall mean reduction of leaf miner, A. frontella population was more with spirotetramat at 120 g a.i. ha-1 with highest overall mean reduction of 0.52, followed by thiacloprid at 120 g a.i. ha-1 (0.67) and imidacloprid 200 g a.i. ha-1 (0.72). The residues of spirotetramat at 120 g a.i. ha-1 were recorded as 0.55, 0.41, 0.30, 0.17 and 0.03 mg kg-1 at 0, 1, 3, 5, 7 days after spraying, respectively that reached to below detectable limit (BDL) by 10th day. The half life value (RL50) and the corresponding waiting period (Ttol) were worked out to be 4.23 and 1.00 day, respectively. Thiacloprid at 120 g a.i. ha-1 recorded residues of 1.62, 0.74, 0.35, 0.17 and 0.04 mg kg-1 at 0, 1, 3, 5, and 7 days, respectively showing gradual decrease in the residues and reached to below detectable limit (BDL) by 10th day after spraying. The half life value was worked out to be 1.54 days and the waiting period was 7.01 days. Imidacloprid at 200 g a.i. ha-1 recorded residues of 0.47, 0.30, 0.16, 0.03 mg kg-1 at 0, 1, 3, and 5 days and reached to below detectable limit (BDL) by 7th day after spraying. The half life value was worked out to be 2.62 days and the waiting period was 1.00 day. |
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Date |
2016-06-29T14:09:28Z
2016-06-29T14:09:28Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/68242
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Language |
en
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Relation |
D9193;
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Format |
application/pdf
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Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
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