National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Laboratory experiments were conducted to study the persistence toxicity of Thiamethoxam 25 WDG (@20g, 25g, 30g and 35g a.i./ha), Imidacloprid 17.8% SL and Dimethoate 30%EC against adult apterous black legume aphids in cowpea as foliar spray. After 24 hr of exposure, Thiamethoxam persisted for 11, 15, 15 and 23 days when applied at dosages of 20g a.i., 25g a.i., 30g a.i. and 35g a.i./ ha respectively. Imidacloprid and Dimethoate persisted for 21 and 13 days when applied at 25 ml a.i. and 300 ml a.i./ha respectively.After 48 hr of exposure, Thiamethoxam persisted for 14, 16, 16 and 24 days when applied at dosages of 20g a.i., 25g a.i., 30g a.i. and 35g a.i./ha respectively. Imidacloprid and Dimethoate persisted for 22 and 14 days when applied at 25 ml a.i. and 300 ml a.i./ha respectively. The median lethal time (LT50) was least in Thiamethoxam @20g a.i./ha (4.74 days) followed by Dimethoate @300ml a.i./ha (6.69 days), Thiamethoxam @25g a.i./ha (6.79 days), Imidacloprid @25ml a.i./ha (7.83 days), Thiamethoxam @30g a.i./ha (8.12 days) and Thiamethoxam @35g a.i./ha (9.02 days).
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