562 



Journal of Agricultural Research 



Vol. XIII, No. II 



Table Vlll.—Snmmary of inoculation experiments with Coccotnyces spp.from Prunus 

 serotiyia, Madison, Wis., igiy — Continued 



RESULTS 



c, (, f See footnotes c, e, f, Table I. 9 See footnote g, Table II. *■ See discussion, p. 563. 



DISCUSSION OF TABLE VIII 



Either moderate or abundant infection resulted from all inocula- 

 tions with strains from P. serotina, except the first and third of series 

 105 and the first and fourth of series io8. The failure of the first test 

 on series 105 was evidently due to an unsatisfactory inoculum, as is wit- 

 nessed by its low germination and the age of the strain in culture (8.2 

 months). The sparseness of infection from the third test on series 105 

 and the first on series 108 is clearly due, likewise, to unsatisfactory 

 inocula. In both of these tests the inocula were prepared by crushing 

 fresh ascocarps in sterile distilled water, a method which was subsequently 

 discarded as unsatisfactory. The reasons for the sparseness of infecrion 

 from the last inoculation of series 108 are not understood. They may 

 well be associated with the high temperatures which prevailed in the 

 greenhouses at the time of this test. 



