12 



EXPERIMENT STATION BULLETIN. 



Scab control. Dusting gave almost complete control of scab on the 

 fruit. There was only 1.7% of scabby fruit on the count trees. On 

 the sprayed trees there was nearly 6% more of scabby apples than on 

 dusted trees. The failure of the sprayer to work satisfactorily at all 

 times was probably responsible for some of the scab on these trees. On 

 the check tree there was 30.0% of scabby apples. This was high enough 

 to give a good check on the treated trees. 



Insect Control. There was so little insect injury, on the check tree, 

 that no comparison can be made. 



The tabulated results of all counts are given in Table IV. 



EXPERIMENTS AT GRAND LEDGE 



Spraying experiments were continued in the orchard near Grand 

 Ledge belonging to Mr. C. W. Garlock. The work done there in 1917 

 has already been reported.* The work here in 1918 was in two parts: 



(1) a test on Baldwin of Sherwin-Williams dry lime-sulphur and (2) 

 a test of calcium arsenate on Ben Davis. 



A TEST OF DRY LIME-SULPHUR ON BALDWIN 



Materials. There were three rows of Baldwin trees with ten trees 

 in a row. Each row was used as a separate plot. The dry lime-sulphur 

 was used at two strengths and standard liquid lime-sulphur was used 

 for comparison. The plots were treated as follows: 



Plot 1. Sherwin-Williams dry lime-sulphur, 5% Ibs. in 50. 

 Plot 2. Sherwin-Williams dry lime-sulphur, 3 Ibs. in 50. 

 Plot 3. Liquid lime-sulphur, 1 to 40. 



0000000000 



CHART IV. Diagram showing arrangement of trees and plots in the Garlock orchard at Grand 

 Ledge. D, Ben Davis; B, Baldwin; C, check; O, other varieties; S, small tree. Numbers indicate 

 count trees. Plot 1, Sherwin-Williams dry lime-sulphur, 5 in 50; Plot 2, Sherwin-Williams 

 dry lime-sulphur, 3 in 50; Plot 3, dilute lime-sulphur; Plot 4, calcium arsenate; Plot 5, lead arsenate 



Lead arsenate (dry) was used on all plots at the rate of 1% pounds 

 in 50 gallons. The arrangement of the plots and trees is shown in 

 Chart IV. 



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



