32 EXPERIMENT STATION BULLETIN. 



cherries were found on trees sprayed with lime-sulphur. This indicates 

 very strongly that dilute lime-sulphur will prevent the first or primary 

 infection of 'this disease and that sulphur dust will not. No statement 

 can be made at this time regarding the control of this disease after 

 it has become established in the trees. Cane-blight is frequently found 

 on black raspberries so it will be well not to plant them as an intercrop 

 in cherry orchards or in close proximity to them. 



SUMMARY OF RESULTS OF EXPERIMENTS WITH CHERRIES 



AND PLUMS 



Foliage Injury ~by Arsenicals. In 1918 Moore's Arctic plums and 

 Early Richmond cherries were sprayed with calcium arsenate in com- 

 bination with dilute lime-sulphur. Lead arseuate was also used for 

 comparison. Neither material caused any injury on either cherries or 

 plums. 



In 1919 Lombard, Shropshire Damson and Moore's Arctic plums were 

 sprayed with Corona dry lead arsenate, Corona calcium arsenate, Dow 

 magnesium arsenate, rex calsium arsenate and Nu Rexform lead 

 arsenate. These materials Avere used in combination with lime- 

 sulphur. There was considerable foliage injury on all sprayed trees 

 but it was of the type of injury frequently found when lime-sulphur is 

 used during hot weather. The temperature was high when part of this 

 spraying was done. There was some arsenical injury but it was not 

 .confined to the trees sprayed with any one material. 



These results indicate that sour cherries and plums (not including 

 Japanese varieties) are not so susceptible to arsenical injury to the 

 foliage as some other fruits. 



Dusting Japanese Plums. Trees of several varieties of Japanese 

 plums were dusted during the season of 1918 to determine if the foliage 

 would be injured in any way by -dusting material composed of sulphur 

 and lead arsenate. There was no injury at any time to the Japanese 

 varieties nor was the foliage of several varieties of native plums in- 

 jured. 



Dusting and Spraying Cherries at the College. An orchard of Mont- 

 morency and English Morello cherries was used for a comparative test 

 of spraying with dilute lime-sulphur and dusting with sulphur dust 

 for the control of shot-hole fungus. The work with Montmorency gave no 

 conclusive results as no disease developed on the check trees. The work 

 with Morello, however, gave definite results. Dilute lime-sulphur con- 

 trolled shot-hole fungus satisfactorily. Dusting did not control it. 



In the dusted plot a disease caused by Coniothyrinm developed seri- 

 ously but there was none of it on trees sprayed with dilute lime-sulphur. 



