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A laboratory evaluation of pirimiphos methyl and difluron admixed with wheat against the granary weevil

, : A laboratory evaluation of pirimiphos methyl and difluron admixed with wheat against the granary weevil. New Zealand Journal of Agricultural Research 25(1): 113-117

Maldison, pirimiphos methyl and difluron were tested against the granary weevil (S. granarius (L.)). Pirimiphos methyl, LC95 0.75 ppm, was considerably more active than maldison, LC95 3.4 ppm. As difluron acts by inhibiting cuticle formation, it was not active against adult weevils. Insecticide concentrations giving a 95% reduction in the F1 generation population over the control treatments, were: pirimiphos methyl 0.5 ppm, difluron 1.9 ppm and maldison 2.0 ppm. Pirimiphos methyl was the most cost effective compound tested. A method for assessing the eveness of distribution of insecticide dust through grain is also presented.


DOI: 10.1080/00288233.1982.10423380

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