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Excerpt from The Epidemic of Barley Yellow Dwarf on Oats in 1959 Starting on April 13, 195 9, inspections for the presence of aphids on known winter hosts and on wild and cultivated grasses were made two to three times weekly at nine locations near Ottawa. Regular inspections were also made to determine the earliest aphid infestations, and the first evidence of disease in Spring-sown grains. Dates on which observations of particular interest were noted are as follows: April 13 Aphid eggs, but no aphids, on Sorbus spp. Crataegus Spp. And Prunus Spp. In the Arboretum at Ottawa. No evidence of aphids in winter grains or perennial grasses. Spring grains not yet sown. 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.