Excerpt from Land-Improvement Measures in Relation to a Possible Control of the Beet Leaf-Hopper and Curly Top F rom the standpoint of control it is important that the beet leafhopper must have a continuous sequence of food plants through out the year ih order to maintain itself from season to season. In the ordinary development of leafhopper populations such a contin nous sequence depends upon three different sets of plants, Since in general there are no perennials capable Of serving as both breeding and food plants throughout the year. The first set of plants carries the insect through the fall-winter-spring period and the next set through the summer period However, the growing period Of these two sets Of plants always overlaps in the Spring, permitting the insect to go from the first to the second, but where fall rains are scanty there is a gap in the fall when summer annuals are dead and winter annuals have not germinated. During this period a third set of plants, functioning as hold-over hosts, is necessary to carry the insect until winter annuals germinate. 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.