EFFECTIVENESS OF SLOW-RELEASE INSECTICIDE (CHLORPYRIFOS 10% W/W) AGAINST SITOPHILUS ORYZAE (L.) (COL. CURCULIONIDAE) IN PACKAGED WHEAT I.2

TEE SZE PENG

SUMMARY

Adult rice weevils, Sitophilus oryzae (L.) were exposed to-slow- releas cehlorpyrifos (10% w/w) dispensers of sizes 1.5, 5, 15, 20 and 25 cm²) in wheat packages . Complete mortality of adult weeviils resulted after 30 days exposure in the packages treated with dispenser measuring 20 and 25 cm². However, oviposition was not prevented as F₁, progeny of weevils continued to emerge betweed 30 and 60 days, but most of the progeny that emerged were dead whwn examined at 60 days. No significant loss in weight of grain was not in packages treated with 5 to 25cm² dispensers between 60 and 90 days. However, in these treatments, initial grain by aduilt feeding and larval development between 30 and 60 days was significant. The potential used of the insecticide formulation for controlling insects of store grains seeds were discussed

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