UNITED STATES DEPARTMENT OF AGRICULTURE 
&J9*&mfL 
BULLETIN No. 911 
Contribution from the Bureau of Entomology 
L. O. HOWARD, Chief 
Washington, D. C. 
PROFESSIONAL PAPER 
December 13, 1920 
LIFE HISTORY OF THE GRAPE-BERRY MOTH IN 
NORTHERN OHIO. 1 
By H. G. Ingerson, Scientific Assistant, Deciduous Fruit Insect Investigations. 
CONTENTS. 
Method of conducting rearing work 
Weather conditions in 1916, 1917 and 1918 
Seasonal-history studies, 1916 
Seasonal-history studies, 1917 
Page. 
Seasonal-history studies, 1918 24 
Miscellaneous records 32 
Summary 37 
METHOD OF CONDUCTING REARING WORK. 
The studies reported in this paper on the grape-berry moth 
(Polyclirosis viteana Clem.) began in 1916 with the collection of 
grapes which were infested with early hatching first-brood larvae. 
These infested grapes were taken to the open-air insectary and 
placed in cylindrical wire baskets whieh held from 1 to 1J 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 larvse pupated 
1 The data reported in this paper were accumulated during the seasons of 1916, 1917, and 1918. The ac- 
tual 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 TJ. 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. Bu- 
reau 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 
