10 



EXPERIMENT STATION BULLETIN. 



None of the foliage of sprayed trees was in the same clean, bright 

 condition as that on the dusted trees. 



The foliage of the check trees was in very good physical condition. 

 There was a small amount of scabby leaves. 



TABLE III. RESULTS WITH NORTHERN SPY AT MUIR, 1918. 



Fruit. Because of the very low percentage of scabby apples on the 

 check tree, no comparison can be made as to the fungicidal value of the 

 different materials. The same is true with regard to insects. There is 

 some difference in the amouftt of leaf roller injury, but this is probably 

 due more to a spotted infestation than to the insecticide used. 



The fruit from two dusted trees, two trees in each sprayed plot and 

 from the check tree was sorted and counted. The results are shown in 

 Table III. 



A COMPARISON OF DUSTING WITH SPRAYING AT BELDING. 



A comparison was again made of dusting and spraying at Belding 

 in the Baldwin orchard belonging to Mr. B. F. Hall. The object of this 

 work was to compare the fungicidal and insecticidal value of the two 

 methods of application, also to study the. effect upon the foliage of the 

 different materials. The experimental plots were located in the south- 

 east corner of the 100-acre orchard. The trees are eighteen years old. 



Materials. A block of eighty trees was divided into two plots. One 

 plot was dusted and the other one sprayed. A tree was left untreated 

 as a check. The plots were treated as follows: 



Plot 1. Sprayed. Lime-sulphur, 1 to 40, and lead arsenate (dry), 



114 in 50. 

 Plot 2. Dusted. 85-15 and 3 in 1 mixtures. 



The 85-15 mixture was used for the first two applications and the 

 3 in 1 mixture for the last two. There was no 85-15 mixture available 

 for these applications. All the dusting materials were furnished by 

 Mr. Hall. The arrangement of the plots is shown in Chart III. 



