Evaluation of Pirimiphos-Methyl as a Protectant for Export Grain1

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Abstract
Wheat and corn were treated with pirimiphos-methyl at an intended concentration of 5 ppm during loading aboard a bulk dry-cargo vessel to assess its biological efficacy as a protectant on export grain in transit. The treatment applied to corn (24,894 metric tons) and wheat (20,561 metric tons) reduced the insect infestations by 96%and 83%, respectively, although populations were low at the time of loading (Sitophilus zeamais (Motschulsky), red flour beetle, Tribolium castaneum (Herbst), granary weevil, Sitophilus granarius (L.), and lesser grain borer, Rhyzopertha dominica (F.), showed that the applied dose was marginal and failed to prevent development of F1 progeny of all test insects.

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