June lo, 1918 Experiments with Coccomyces spp. from Stone Fruits 559 



DISCUSSION OF TABLE VI 



Either a moderate or an abundant infection (PI. 57) resulted from all 

 inoculations except the first and second of series 103 and the third of 

 series 1 10. The sparseness of infection in series 103 was probably due to 

 a diminution of the pathogenicity of the fungus in culture, as both of the 

 tests were made with inocula from a strain which had been in culture for 

 more than 20 months. The reasons for the low degree of infection from 

 the last inoculation of series 1 10 are not understood. It is possible again 

 that the high temperatures of this period may have been inhibitory. 

 P. domestica (see footnote h), P. insititia, and P. americaiia were con- 

 sistently infected. P. mahaleb was sparsely infected, but not consist- 

 ently. P. salicina and P. munsoniatia, in one case each, developed 

 infection after prolonged incubation in the greenhouse. Similarly, in 

 two cases, A . persica developed sparse infection. The single test with 

 P. hesseyi yielded positive results after prolonged incubation. No other 

 infection was observed. Sometimes spots or flecks developed on P. padus, 

 P. salicina, and P. munsoniana. 



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

 virginiana, Madison, Wis., igij 



INOCULATIONS « 



o See footnote a. Table II. 

 t> See footnote b. Table I. 

 : See Table VIII. 



