UNITED STATES DEPARTMENT OF AGRICULTURE 



BULLETIN No. 837 A 



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Washington, D. C. 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



June 3, 1920 



CONTROL OF THE GRAPE-BERRY MOTH IN NORTHERN OHIO. 



By H. G. Ingekson, Scientific Assistant, and G. A. Runner, Entomological 

 Assistant, Deciduous Fruit Insect Investigations. 1 



CONTENTS. 



Page. 



Introduction X 



History in Ohio 2 



Northern Ohio conditions affecting 



infestation '2 



Varietal infestation 4 



Seasonal history 4 



Page. 

 Relation between seasonal-history 



data and control measures 5 



Natural control of first-brood larvce_ 6 



Control experiments 7 



Conclusiona 26 



Recommendations 26 



INTRODUCTION. 



The grape-berry moth {Polychrosis vitecma Clem.) has been the 

 most destructive insect pest with which the grape growers of north- 

 ern Ohio have ever had to contend. In an effort to improve the 

 methods of control for this insect, extensive experiments in coopera- 

 tion with the Ohio Agricultural Experiment Station were conducted 

 during the seasons of 1916, 1917, and 1918 in northern Ohio. The 

 results of these experiments and the recommendations based thereon 

 are contained in this paper, together with observations made during 

 the investigation. Only such life-history data are presented as are 

 necessary for the understanding of the control experiments. The 

 complete life-history data will be presented in a later paper. 



1 This investigation was conducted under the direction of Dr. A. L. Quaintance, En- 

 tomologist in Charge of Deciduous Fruit Insect Investigations of the Bureau of Ento- 

 mology. The senior author, assisted by E. R. Selkregg, then field assistant in the 

 Bureau of Entomology, conducted the work during the season of 1916. Much credit is 

 due Dwight Isely of the Bureau of Entomology for his suggestions on grape-insect control, 

 based on similar investigations in the Chautauqua-Erie grape belt of Pennsylvania. The 

 results of Mr. Isely's investigations are published in United States Department of Agri- 

 culture. Bulletin No. 550. The authors wish to express their appreciation to Prof. H. A. 

 Gossard, entomologist of the Ohio Agricultural Experiment Station, for his help in many 

 ways. To the many grape growers who have cooperated most willingly the authors 

 express their thanks. 



147842°— 20— Bull. 837 1 



