Safety Evaluation of Newer Molecules of Insecticides Against Promsing Parasitoid and Prdators of Crop Pests
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Title |
Safety Evaluation of Newer Molecules of Insecticides Against Promsing Parasitoid and Prdators of Crop Pests
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Creator |
Halappa B.
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Contributor |
J.S. Awaknavar
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Subject |
Agricultural Entomology
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Description |
Investigations on Safety evaluation of newer molecules of insecticides against promising parasitoid and predators of crop pests were undertaken during 2009-10, under laboratory condition at University of Agricultural Sciences, Dharwad. In Trichogramma chilonis, results of the bioassay on the eggs revealed that highest emergence from the treated eggs noticed in Btk (94.85%) followed by N. rileyi, imidacloprid, difenthiuron and endosulfon all of which allowed more than 80 per cent emergence. Indoxacarb and azadirachtin were detrimental which allowed only 60 per cent of the adult emergence. In the dry film bioassay on adults of T. chilonis, endosulfon (LC50 0.0337%) proved to be safest followed by difenthiuron (0.0231%) and Btk (0.0032%). Imidacloprid, indoxacarb, flubendimide and azadirachtin were highly detrimental with the LC 50 range of 0.0003 to 0.0006 per cent. Spraying on cocoons of C. plutellae revealed novaluron and emamectin benzoate to be the safest insecticides which allowed maximum emergence of adults (more than 90%). Least emergence was noticed in indoxacarb which was highly detrimental followed by rynaxypyr (62.00%), flubendiamide (51.00%) which proved to be slightly better on adults of C. plutellae. In the dry film residue bioassay on high safety revealed with novaluron (LC50 0.0621 %) followed by spinosad, emamectin benzoate and azadirechtin (0.0405%). Indoxacarb, rynaxypyr and flubendiamide were highly detrimental with a LC50 range of 0.0003 to 0.0006 per cent. Spraying on grubs of C. montrouzeiri revealed that even sub lethal dose of all the insecticides caused mortality ranging from 23.33 to 90.00 per cent. The data on the mean mortality of the three doses tested revealed buprofezin and azadirachtin to be safest causing about 34.00 per cent mortality. The most detrimental effect was noticed with imidacloprid, carbaryl and acetamiprid causing highest mortality in the range of 96.67 to 91.11 per cent. Acute toxicity studies on adults of C. montrouzeiri revealed dichlorvas and buprofezin to be the safest followed by imidacloprid, acetamiprid and azadirachtin (LC50 range of 0.0589 to 0.0235%). Fipronil and carbaryl were highly detrimental with least LC 50 values. |
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Date |
2016-11-10T16:32:44Z
2016-11-10T16:32:44Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84960
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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