Abstract
Two warehouses at Nairobi, Kenya, containing fumigated bagged wheat were treated with dichlorvos slow- release strips at I strip per 25 m3 (free space) and compared with neighboring untreated warehouses for 18-20 weeks. The treatment effected satisfactory and economic control of the almond moth (the tropical warehouse moth), Cadra cautella (Walker), throughout the observation period, in an undisturbed warehouse with little ventilation and no time lapse between fumigation and application of the strips. In the other warehouse, with less favorable conditions, control was not so good, especially where there was a short delay (2-3 days) after fumigation. The treatment was ineffective against the red flour beetle, Tribolium castaneum (Herbst). Observations are included on the probable duration of vapor evolution by the strips.
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