Laboratory evauation of relative toxicity of cypermethrin alone and in combination with certain Insecticides endosulfan, monocrotophos and carbaryl at five concentrations for each instar studied against the larvae of Spodoptera litura Fabricius in five instars by bio-assay method to determine LC 50 and LC 90 values indicated that cypermethrin alone was the most toxic to the larvae of tobacco caterpillar In all instars followed by cypermethrin + carbaryl, cypermethrin + monocrotophos and cypermethrin + endosulfan.
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Madras Agricultural Journal (MAJ)
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Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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