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Comparative persistent toxicity of low volume concentrate and emulsifiable concentrate wettable powder formulations of some insecticides to important insect pests of cotton

Sandhu, G.S.; Singh, H.

Journal of Research Punjab Agricultural University 12(4): 387-393

1975


ISSN/ISBN: 0048-6019
Accession: 004997362

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The sprays of EC/WP [emulsifiable concentrate/wettable powder] formulations of insecticides gave a greater volume median diameter (VMD) of spray droplets and a larger number of droplets/cm2 than LVC [low-volume concentrate] formulations. LVC formulations of insecticides gave a significantly greater persistent toxicity to the cotton jassid [Amrasca biguttula biguttula (Ishida)] than EC/WP formulations of insecticides; the 2 formulations were equally persistent against the cotton aphid [Aphis gossypii Glover]. LVC formulation of toxaphene yielded greater persistent toxicity to spotted bollworm [Earias vittella (F.)] than its EC formulation; LVC and EC formulations of endosulfan were equally persistent. WP formulation of carbaryl gave greater persistent toxicity than its LVC formulation. Of all the treatments, carbaryl LVC (0.625 kg a.i.[active ingredient]/ha) gave a significantly high persistent toxicity to the cotton jassid, followed by dimethoate LVC (0.187 kg a.i./ha). With the cotton aphid, dimethoate EC (0.187 kg a.i./ha) = formothion EC (0.187 kg a.i./ha) = formothion LVC (0.187 kg a.i./ha) showed the maximum persistent toxicity, followed by malathion EC (0.500 kg a.i./ha) = dimethoate LVC. Irrespective of the formulations, systemic insecticides were more persistent against aphids than non-systemic insecticides. No such trend was observed in jassids. Against the spotted bollworm, carbaryl WP (0.875 kg a.i./ha) was the most persistent.

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