New York Agricultural Exi'krimkxNt Station. 



397 



The first treatment of the season was given to Series 1 May 14, 

 soon after the blossoms had fallen. 



In Series .3 Italian Prune and Lombard were sprayed as late 

 as July 14. It was thought safe to do this for they are medium 

 late varieties, but Guii, see Series 4, was not sprayed as late as 

 this because it is an early variety and this treatment would come 

 too near the time v/hen it ripens its fruit. 



Results. — Through the early part of the season the unsprayed 

 trees showed but little of the leaf-spot, but as the season ad- 

 vanced the effects of the disease became more noticeable, especi- 

 ally on Italian Prune. The treated trees of this variety showed 

 slightly more injury in Series 2 than in either Series 1 or 3, but 

 in all three series they were far superior to the untreated trees. 

 As early as August 12 the ground under ciany of the unsprayed 

 Italian Prune trees was thickly strewn with fallen leaves, and 

 in consequence of this loss of foliage the fruit was ripening 

 prematurely and dropping. The unsprayed Guii trees at this 

 time showed some loss of foliage, but the unsprayed Lombards 

 were in nearly as good condition as the sprayed trees. 



A careful estimate of the amount of loss or injury of foliag(> 

 of the trees under experiment was made October 3, from which 

 the following summary is derived: 



