4 THE GRAPE ROOT-WORM. 



1908 and 1909 Mr. A. G. Hammar was detailed to the grape root- 

 worm investigation and devoted his attention particularly to life- 

 history studies, assisted by Mr. E. Selkregg. Prof. H. A. Sur- 

 face, state zoologist of Pennsylvania, assigned, as a representative 

 of the Pennsylvania department of agriculture, Mr. F. Z. Hartzell 

 during 1908, and Mr. H. B. Weiss during the year 1909. These 

 gentlemen assisted in field operations and rendered most efficient 

 service, contributing much to the success of the investigation. In 

 the present report Mr. Johnson has prepared the manuscript detail- 

 ing results of field experiments and Mr. Hammar the manuscript 

 detailing results of life-history studies, and most of the iUustrations. 



The results obtained by this study, as detailed in the subsequent 

 pages, will, it is believed, furnish entirely practicable and economical 

 measures for the control by vineyardists of this serious insect pest. 

 It is essential, however, in order that satisfactory results may be 

 secured, that the recommendations given be followed in a thorough 

 and timely manner. 



The authors desire to express their thanks to the foUowing vine- 

 yardists of North East, Pa. : Mr. George Blaine, Mr. W. S. Wheeler, 

 Mr. R. Davidson, ^ir. W. E. Gray, Mr. H. S. Mosher, and Mr. A. I. 

 Loop, for their direct assistance in the conduct of this investigation 

 by placing large blocks of their vineyards at the disposal of the 

 Bureau of Entomology for several seasons and assisting in conduct- 

 ing experiments thereon. They also wish to thank the large number 

 of vineyardists whose interest in the work during its progress has 

 been a source of inspiration and gratification to them throughout 

 this period. 



A. L. QUAINTANCE, 



In Charge of Deciduous Fruit Insect Investigations. 



