DUSTING AND SPRAYING EXPERIMENTS OF 1918 AND 1919. 



EXPERIMENTS WITH APPLES 



The work done with apples in 1918 was largely a comparison of the 

 dusting and spraying methods of application. Tests were also made 

 with calcium arsenate and Sherwin-Williams dry lime-sulphur. 



In 1919 the work consisted mainly of tests of the dry. lime-sulphurs 

 and of several arsenicals. Some dusting was also done. 



EXPERIMENTS IN 1918 



COMPARISONS OF DUSTING WITH SPRAYING AND CALCIUM ARSENATE WITH 

 LEAD ARSENATE AT MORRICE 



In the orchard at Morrice, belonging to Geo. Winegar and Son, dust- 

 ing and spraying experiments were continued. Experimental work 

 had been carried on in this orchard during 1915, 1916 and 1917. The 

 results of this earlier work have already been published.* The entire 



CHART I. Diagram showing arrangement of trees and plots in the Winegar orchard at Morrice. 

 B, Baldwin; S, Stark; C, check; O, other varieties. The numbers indicate count trees. Plot 1, 

 dusted; Plot 2, sprayed with lime-sulphur and calcium arsenate; Plot 3, sprayed with lime-sulphur 

 and lead arsenate. 



* Special Bulletin No. 87. Dusting and Spraying Experiments with Apples. 



