EXPERIMENT STATION BULLETIN. 



CHART II. Diagram showing arrangement of trees and plots in the Braman orchard at Muir. S, 

 Northern Spy; C, check; T, water tank. Numbers indicate count trees. Plot 1, sprayed with 

 lime-sulphur and lead arsenate; Plot 2, sprayed with lime-sulphur and. calcium areenate.. The 

 entire orchard of 40 acres, except Plots 1 and 2 was dusted. 



Materials. The main part of the orchard was dusted by Mr. Braman. 

 A block of 36 trees near the middle of the orchard was used for the 

 spraying materials. One of these trees was left untreated as a check. 

 The block of 36 trees was divided into two plots and treated as follows : 



Plot 1. Lime-sulphur, 1 to 50, and lead arsenate (dry), iy 2 Ibs. 

 in 50. 



Plot 2. Lime-sulphur, 1 to 50, and calcium arsenate, 1 Ib. in 50. 



Plot 3. This included the entire orchard other than Plots 1 and 2. 



For the first two applications, a 3 in 1 mixture was used and for the 

 last two an 85-15 mixture was used. The arrangement of the trees and 

 plots is shown in Chart II. 



Applications. Four applications were made on all plots. They were 

 made at the following periods: 



1st. Pink or cluster application. 



2nd. Calyx application. 



3rd. Two weeks after second. 



4th. First week in August. 



The spraying was done with a spray gun. 200 to 225 Ibs. pressure 

 was maintained. All dusting was done at night, except the last appli- 

 cation, by Mr. Wolverton, the man directly in charge of the orchard. 

 For each application, material was applied to one side of each row dur- 

 ing one night and to the opposite side the next night. The fourth 

 application was made in the same manner, only during calm periods 

 in day time. 



RESULTS 



Foliage Injury. The foliage on all dusted trees was in excellent 

 physical condition and free from disease. 



The foliage of the trees in the lime-sulphur-lead arsenate plot was in- 

 jured some, but not seriously. Only a small percentage of the leaves 

 showed any injury. There was no disease. 



The foliage of trees in the lime-sulphur-calcium arsenate plot was 

 severely injured by the calcium arsenate, but not badly enough to cause 

 many leaves to drop during the summer. There was no disease on 

 these leaves. 



