A Laboratory Apparatus for Determining Repellency of Pyrethrum When Applied to Grain

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Abstract
An apparatus was developed for testing the repellency of insecticide-treated grains to stored product insects. This apparatus had 12 cups which held samples of treated and untreated grains in an enclosure in which the insects were liberated. The insects entered the sample they selected, and the relative numbers present in the treated and untreated samples indicated the degree of repellency. Data are presented to illustrate the effectiveness of the apparatus in determining the repellency of treated grains to certain stored product insects. Adult flour beetles were able to detect the differences between 0.1 and 0.3 and between 0.25 and 0.37 ppm of pyrethrins.

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