Life history of the grape-berry moth in northern Ohio /

The studies reported in this paper on the grape-berry moth (Polychrosis viteana Clem.) began in 1916 with the collection of grapes which were infested with early hatching first-broed larve.These infested grapes were taken to the open-air insectary and placed in cylindrical wire baskets which held from 1 to 14 quarts each.These baskets were placed in glass battery jars which had been supplied with about one-half inch of sand in the bottom.This sand absorbed the juice from the infested grapes and maintained a fairly constant humidity in the jars.The jars were closed with cloth covers.Fresh grape leaves were placed in the battery jars in the space between the wire baskets and the glass surface, and the larve pupated 1 The data reported in this paper were accumulated during the seasons of 1916, 1917, and 1918.The actual rearing records were secured at Sandusky, Ohio, and the field observations were made in the grape sections about Sandusky, including the Lake Erie islands, in Dover and Avon sections west of Cleveland, and in the Euclid section east of Cleveland.Control experiments based on these life-history studies were conducted each season and the satisfactory control effected proved the value of such life-history data.The results of the control experiments are published separately as U. S. Department of Agriculture Bulletin 837.These investigations were conducted in cooperation with the Ohio Agricultural Experiment Station.During the season of 1916 the writer was assisted by E. R. Selkregg, then field assistant in the U. S. Bureau of Entomology.Mr. Selkregg was in direct charge of the rearing work for 1916.In the seasons of 1917 and 1918 the writer was assisted by Chester I. Bliss, field assistant in the U. S. Bureau of Entomology.7678°-20--1 TsBiE I.-Time of leaving grapes of first-brood larve of the grape-berry moth in 1916.Fruit collected at Venice, Put-in-Bay, and Kelley's Island, Ohio.