56o 



Journal of Agricultural Research 



Vol. XIII, No. II 



Tabi^E VII. — Summary of inoculation experiments with Coccomyces spp. from Prunus 

 virginiana, Madison, Wis., igiy — Continued 



RESULTS 



c, «, / See footnotes c, e, f, Table I. 

 g See footnote g, Table II. 



^ Secondary infection was very abundant. 

 » See discussion, p. 561. 



DISCUSSION OF TABLE VII 



Either moderate or abundant infection resulted from all inoculations 

 except the second and third of series iii, the first of series 117, and 

 the first of series 119. In all these cases the sparseness of infection 

 was probably attributable to unsatisfactory inocula. It will be noted 

 that all the inocula were obtained from cultures. Of all the strains of 

 fungi used in these inoculation experiments, those from P. virginiana 

 were by far the most difficult to induce to sporulate satisfactorily in 

 culture. Thus, in certain cases the inocula were unsatisfactory because 

 of sparseness of spores. It will also be observed that the inocula of 

 Table VII usually germinated less vigorously than did those of the 

 other tables. Negative germination results in the laboratory tests, 



