556 



Journal of Agricultural Research 



Vol. XIII, No. II 



DISCUSSION OF TABLE IV 



All the inoculations with strains from P. mahaleh induced either mod- 

 erate or abundant infection. P. cerasus, P. avium, and P. mahaleb were 

 consistently moderately or abundantly infected. The disease was 

 usually slightly less severe on P. mahaleb than on the cultivated cherries. 

 This may well be due to the fact that these strains in all likelihood origi- 

 nally passed to P. mahaleb from P. cerasus, inasmuch as they were isolated 

 from P. mahaleb trees which had grown from P. cerasus stocks in an old 

 neglected orchard in Door County, where P. mahaleb is rarely found. 

 P. pennsylvanica was also consistently infected, but less abundantly. 

 In one case P. besseyi was infected out of doors. In certain cases, after 

 prolonged incubation in the greenhouse, P. insititia and P. munsoniana 

 developed infection, while in certain instances spotting occurred on 

 P. munsoniana, P. padus, P. domestica, and A. persica. In one case in 

 the greenhouse, flecks developed on P. americana B. No other infection 

 occurred. 



Table V. — Summary of inoculation experiments with Coccomyces spp. from, Prunus 

 pennsylvanica, Madison, Wis., igij 



INOCULATIONS « 



a See footnote a. Table II. 

 b See footnote b. Table I. 



