Abstract
Malathion as an emulsifiable concentrate and as a dust was applied at 3 dosage levels on inshell walnuts and evaluated in the laboratory against the Indian-meal moth, Plodia interpunctella (Hübner), and the merchant grain beetle, Oryzaephilus mercator (Fovea). Initial dust residues of 2 and 4 ppm controlled only the eggs and young larvae of the beetle for 12 months. Dust residues that were 6 ppm at the start of the test controlled all stages of the beetle and the egg and 1st-instar larval stages of the moth for 12 months and prevented infestation by all stages of both species for 6 months. The emulsify able concentrate treatment as applied was relatively ineffective.
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