. Bulletin of the Department of Agriculture. Agriculture. BULLETIN OF THE M No. 19 Contribution from the Bureau of Entomology, L. O. Howard, Chief. January 24, 1914. (PROFESSIONAL PAPER.) THE GRAPE LEAFHOPPER IN THE LAKE ERIE VALLEY. By Fred Johnson. Agent and Expert. INTRODUCTION. For several years past the grape leafhopper, TypJilocyha comes Say (fig. 1), has been increasing in destructive numbers throughout the vine- yards of the Lake Erie Valley, and since 1910 it has been recognized as a serious menace to the grape-growing interests of that region. During the years 1910 and 1911 vine
. Bulletin of the Department of Agriculture. Agriculture. BULLETIN OF THE M No. 19 Contribution from the Bureau of Entomology, L. O. Howard, Chief. January 24, 1914. (PROFESSIONAL PAPER.) THE GRAPE LEAFHOPPER IN THE LAKE ERIE VALLEY. By Fred Johnson. Agent and Expert. INTRODUCTION. For several years past the grape leafhopper, TypJilocyha comes Say (fig. 1), has been increasing in destructive numbers throughout the vine- yards of the Lake Erie Valley, and since 1910 it has been recognized as a serious menace to the grape-growing interests of that region. During the years 1910 and 1911 vineyard experiments for the con- trol of this pest were conducted by the members of the field laboratory force stationed at North East, Pa., working under the direction of Mr. A. L. Quaint- ance, in charge of Deciduous Fruit Insect Investiga- tions of the Bureau of Entomology. Owing to the pressure of work involved in the conduct of numer- ous vineyard experiments against this pest, and also against the rose-chafer (Macrodactylus suhspinosus Fab.) and the grape-berry moth (PolycJirosis viteana Clem.), it was impossible to make a de- tailed study of the life history of the grape leaf- hopper during those seasons. As most of these field experiments had been brought to a success- ful termination at the close of the season of 1911, the investigations for the season of 1912 were devoted largely to life-history studies of tliis pest. In this work, which was carried on at the field laboratory at North East, Pa., the writer was assisted by Mr. E. R. Selkregg in the recording of the data bearing upon the various stages of the life history of the insect. The following pages contain a record of these Ufe-history studies, together with a short historical account of the part this insect has })layed as an enemy of the graj^evine in other grape-producing sec- tions of the United States and Canada. A detailed account is given 10037°—Bull. 19—14 1. Fig. 1.—The grape leaf- hopper ( Typhlocyb
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