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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
 
Creator Halappa B.
 
Contributor J.S. Awaknavar
 
Subject Agricultural Entomology
 
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.
 
Date 2016-11-10T16:32:44Z
2016-11-10T16:32:44Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84960
 
Format application/pdf
 
Publisher UAS, Dharwad