Abstract
Emulsion sprays of malathion containing 83.6% AI were applied to dry (11.7% moisture content) and tough (16.8% moisture content) wheat at 8 or 12 ppm to determine the stability of the insecticide at different storage temperatures during 9 months. Bioassays with adults of Cryptolestes ferrugineus (Stephens) showed that malathion persisted for a longer period on dry or tough wheat stored in a farm granary at −31.5° to 18°C or in the laboratory at 10°C than in grain stored at 20° or 30°C. Residue analysis showed a gradually increasing rate of breakdown of the insecticide on dry or tough wheat stored in the farm granary and at 10°C; the breakdown rate was more rapid at 20° than at 10°, and most rapid at 30.
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