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Laboratory assessment of the toxicity of field weathered deposits of some insecticides on cotton to the nymphs of red cotton bug dysdercus cingulatus



Laboratory assessment of the toxicity of field weathered deposits of some insecticides on cotton to the nymphs of red cotton bug dysdercus cingulatus



Punjabrao Krishi Vidyapeeth Research Journal 3(2): 83-86



Ten insecticides were assessed for their residual toxicity under laboratory conditions using 4th instar nymphs of Dysdercus cingulatus as test insects; field treated leaves and green bolls were used as food. The leaves and green bolls from treated cotton crops were brought into the laboratory after specific intervals of 24, 48 and 72 h after application. As substantial mortality in test insects was observed up to only 48 h, the observations recorded after 48 h were considered for comparison. Carbaryl (W.P. [wettable powder]) and its dust and carbaryl + BHC (1:1) 10% dusts were the most effective treatments against D. cingulatus at all intervals tested as compared to other insecticides. These insecticides were highly persistent up to 48 h and continued to give more than 50% mortality even up to 72 h. Deposits of BHC and its dust, metacid-combi [methyl parathion + DDT] and monocrotophos gave 82-97% mortality initially after 24 h of application. These insecticides remained persistent giving 35-43% mortality up to 72 h. Endrin and endosulfan (e.c. [emulsifiable concentrate]) and its dust, although toxic (giving about 69-85% mortality initially) deteriorated more rapidly after 72 h than did carbaryl and carbaryl + BHC. The mortality recorded was only 15-30% after 72 h of treatment.

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