PLUM DISEASES 



355 



bank, Satsuma and others suffer a 

 great deal more than other promi- 

 nent varieties. Careful observa- 

 tions along this line seem desirable. 



Brown-rot of plum is a disease 

 also found on the peach and cherry 

 (see pages 270 and 170, respectively) . 

 On these last two fruits the disease 

 is perhaps more destructive than on 

 plums. The common occurrence 

 of the disease on all these hosts 

 gives it a wide range over this and 

 other countries. Losses in various 

 parts of the United States are es- 

 timated at 30 to 100 per cent on 

 susceptible plums. At times twig- 

 blight is caused by the fungus 

 (Sclerotinia cinerea) ; this type of 

 injury has been reported from Iowa 

 and New York. The Red June, 

 Wickson and other upright-growing 

 varieties are peculiarly susceptible 



to the twig-blight form of this disease. In the Pacific 

 Northwest blossom-blight and mold in transit are important 

 phases of brown-rot on prunes. 



A more complete discussion is given under Peach, page 270. 



REFERENCES 



Hesler, Lex R. Diseases of the plum. Brown rot. In The Fruit 

 Industry in New York State. New York Agr. Dept. Bui. 79: 

 . 1192-1195. 1916. 



Brooks, Charles, and Fisher, D. F. Brown rot of prunes and cherries 

 in the Pacific Northwest. U. S. Agr. Dept. Bui. 368 : 1-10. 1916. 



Stewart, F. C. Notes on New York plant diseases, I. Plum. Twig 

 blight and canker, Sclerotinia fructigena (Pers.) Schrt. New York 

 (Geneva) Agr. Exp. Sta. Bui. 328 : 381-383. 1910. 



FIG. 99. Group of plums 

 mummified by the brown-rot 

 fungus. 



