552 



Journal of Agricultural Research 



Vol. XIII, No. II 



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

 cerasus, Madison, Wis., igiy — Continued 



RESULTS 



c-f See footnotes c to f, Table I. 



The final notes on inoculations of 1917 were made on the following dates: Series i A-D, June 26; all 

 other outdoor series, October 15; all greenhouse series, August 18. 



ft See discussion, p. 551. 



;' In cases where it was not possible to diflcrentiate the results of successive inoculations on the same 

 plant, the combined results of all the inoculations in question are printed in italic type, under the 

 heading of the last inoculation in question, with the appropriate footnote, d, e, or f, and the earlier 

 indistinguishable results are recorded in bold-face type. 



DISCUSSION OF TABLE 11 



Abundant infection resulted from all inoculations except the following: 

 Series lA; series loi, May 9; series 104, May 16; and series 106, May 19. 

 The absence of infection in series lA was evidently due to the fact that 

 this series contained no susceptible plant. Lack of virulence of the 

 inocula probably accounts for the failures in series loi and 104, the 

 strain used having been more than seven months in culture. In series 

 106 the inoculum was evidently unsatisfactory, only a trace of germi- 

 nation occurring in the laboratory test. In these and like series, there- 

 fore, except series lA, the negative results are without value and are 

 excluded from the summary (Table IX), while the positive results are 

 not comparable in regard to the severity of infection with those obtained 



