Excerpt from Use of Malathion-Treated Drying Trays to Protect Raisins From Insects During Drying and Storage Laboratory Bioassays Samples of natural and processed raisins were exposed to adults of Indian-meal moths and saw-toothed grain beetles in the laboratory at the end of the drying period in the vineyards and again after 3, 6, 9, and 12 months of outdoor storage. Malathion at 2 ppm. Or more on the raisins virtually prevented insect development and reproduction for at least one year. Removal of some of the malathion by processing allowed an increase of insect activity. Processing increased the moisture content, but after 8 or 4 months in the laboratory, the mois ture contents of natural and processed raisins were the same. The moisture content increased during the first 6 months the raisins were held in outdoor storage. Microanalyses As the 1961 - 62 storage be gan, raisins dried on malathion-treated trays generally contained more dead insects and insect fragments than raisins dried on untreated trays, but after 12 months in storage, raisins from um treated trays had more insect fragments. Proc essing of the natural raisins greatly reduced the amount of foreign material. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.