250 Report of Farmers' Institutes 



the vigor of the tree is required for the development of the yoimg 

 apples of the current year's crop. The susceptibility of the. 

 " baby " apples to injury suggests the importance of spraying at 

 an earlier period than is usually done by most fruit-growers. Ex- 

 periments by this station point to the destruction of the newly- 

 hatched aphides on the opening buds as the most important step 

 to reduce injuries by this pest. See Geneva Bulletin 402. 

 Thorough spraying of the opening buds will comjDletely destroy 

 an associated species, the oat aphis, as well as afford temporary- 

 relief from the green apple aphis. The possibilities of combating 

 the rosy aphis by this treatment are indicated in the following 

 table which summarizes the data of a spra^ang experiment in an 

 orchard of Rome apple trees, with some interplantings of other 

 varieties. 



Summary of Experiment Agai:nst the Rosy Aphis 



Number and Variety of Tree Treatment 



18 Rome sprayed 



10 Mixed varieties sprayed 



7 Rome not sprayed. . 



Average per sprayed Rome 



Average for all sprayed trees 



Average for unsprayed Rome 



THE CHERRY LEAF-BEETLE 



The fact is probably well known to most institute workers that 

 the greatest surprise of the season, at least to students in ento- 

 mology, was the appearance in large numbers of the leaf-beetle 

 (Galerucella cavicolUs) upon cherries and peaches during early 

 summer. The species w^as widely distributed throughout western 

 1Sq\n York, and was probably more numerous and destructive in 

 the southwestern section, especially in Chautauqua, Cattaraugus 

 and Erie coimties. Complaints of its ravages were received from 

 Arcade, Wellsville, Alden, Irving, Batavia, Rochester, Eden, 

 Jamestown, Randolph, Brant, Angola, Fredonia, Dunkirk, 

 Rochester and Penn Yan. It was also reported as injurious in 

 nursery plantations about Dansville, Clifton Springs and Geneva. 

 IMr. A. B. Buchholz, Horticultural Inspector of the State De- 

 partment of AgTiculture, reported that the beetle was common 

 in the central and eastern portions of Orleans county upon sour 

 cherries and peaches. Mr. L. F. Strickland, Horticultural In- 

 spector of Niagara county, states that the insect was observed at 



