Excerpts from the report: This report presents the findings of an experimental study to determine the efficacy of selected dosages of two diatomaceous earths and two silica aerogels applied to Hard Red Winter wheat as protectants against insect attack. This experiment was an intermediate-type study in a laboratory with 5-cubic-foot masonite bins; it was a companion study to a field-scale test with 3,250- bushel metal bins. There were two objectives of this study. One was to compare the effectiveness of selected dosages of two diatomaceous earths, Kenite 2-I® and Perma-Guard®, and two silica aerogels, Cab-O-Sil® and SG-68®, as wheat protectants with that of the standard application of malathion. The second was to determine the effect on commercial grade and milling properties of wheat and on baking properties of the flour milled from treated wheat. Trade or proprietary names are used in this publication solely to provide specific information. Mention of a trade name does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply either a recommendation for its use or an endorsement over comparable products.