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Effect of temperature on the toxicity of cypermethrin to nymphs of the migratory grasshopper melanoplus sanguinipes orthoptera acrididae



Effect of temperature on the toxicity of cypermethrin to nymphs of the migratory grasshopper melanoplus sanguinipes orthoptera acrididae



Canadian Entomologist 116(9): 1153-1156



Cypermethrin was tested at 9 dosages from 2-72 g AI [active ingredient] ha and at 5 temperatures from 15.degree.-35.degree. C against 2nd-instar nymphs of a non-diapause strain of the migratory grasshopper, M. sanguinipes (Fab.). At lower dosages, mortality increased with increasing temperatures from 15.degree.-30.degree. C and then leveled off. At dosages of 12 g AI/ha or higher, mortality increased slightly with increasing temperature from 15.degree.-20.degree. C, then declined at higher temperatures. Cypermethrin was about 2.2 times less toxic (LD50) at 35.degree. C than at 15.degree. or 20.degree. C and 70% of this reduction in toxicity occurred above 25.degree. C. Thus, the toxicity of cypermethrin was negatively correlated with temperature above 20.degree. C for nymphs of the migratory grasshopper.

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Accession: 005275443

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DOI: 10.4039/ent1161153-9


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