Abstract
Corn storcd in 16 circular metal bins 114.53 m3 (3250 bu) was observed for a period of 15 mo. Four of the lots of corn were sprayed with malathion on the surface, 4 were surface sprayed and a spray applied to the outside wall of the bin, and 4 sprayed only on the outside wall of the bin. The remaining 4 bins served as controls. Samples were drawn to assess the numbers and specics of live insect at monthly intervals. The surface spray application reduced the insect populations whether it was used alone or in combination with the wall spray. The wall spray alone did little to reduce populations.
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