28 



EXPERIMENT STATION BULLETIN. 



on Lombard plums and Montmorency cherries. Rather large plots were 

 treated with each of the materials. No details of the experiment will 

 be given as there was no development of insect or fungus trouble on the 

 check trees of either fruit. 



The trees in the bordeaux plot of each kind of fruit showed severe 

 foliage injury. It was of the yellow leaf type and caused heavy defolia- 

 tion. This was probably due to peculiar weather conditions which were 

 very favorable to the development of such injury. There was a little 

 lime-sulphur injury on both cherries and plums after one of the applica- 

 tions made during hot weather. The foliage of all dusted trees was in 

 excellent condition. 



DUSTING CHERRIES TO CONTROL SHOT-HOLE FUNGUS AT EAST LANSING 



A block of eighty trees of Montmorency and English Morello on the 

 College grounds at East Lansing was used for a comparative test of 

 the dusting and spraying methods for the control of shot-hole fungus 

 or leaf blight,* The trees are ten years old. 



Materials. The orchard was divided into two plots so that each plot 

 contained trees of both varieties. The arrangement of the trees and 

 plots is shown in Chart VII. The materials were used as follows: 



CHART VII. Diagram showing arrangement of trees and plots in cherry orchard at East Lansing. 

 E, English Morello; M, Montmorency; C, check; S, small tree; R, raspberries. 



Plot 1. Dusted. 90-10 mixture except for the last application when 

 sulphur alone was used. 



Plot 2. Lime-sulphur, 1 to 40. Lead arsenate was used when neces- 

 sary. 



Plot 3. Check. Untreated. 



* Shot-hole fungus is caused by Coccomyces hiemalis Higgins. It is also known as leaf- 

 blight, leafrspot and yellow leaf. 



