38o 



Journal of Agricultural Research 



Table IV. — Texture of flesh and skin, ripening date, and relative resistance of varieties of 

 plums to Sclerotinia cinerea 



a -\- Indicates least relative susceptibiUty; 4- 4- + -I- indicates greatest relative susceptibility. 



The results show striking diflferences in resistance of the several 

 varieties to infection. In the case of very susceptible varieties, as the 

 Compass and sand cherry, it is always very easy to get a large number 

 of infection spots. In the case of a very resistant variety, such as 

 BXW15, it is often very hard to cause infection. In one trial, begun 

 on July 8, 1913, in which green plums, about three-quarters grown, 



