82 



James G. Horsfall 



Obviously, the temperature at which spores will germinate best is a 

 factor in incubation. Two experiments to test this were tried, the average 

 results of which are presented in table 21 and illustrated graphically in 

 figure 18. 



Per cent 



76 



'JO 



26 



Figure 18. effect of temperature on germination of conidia of 

 heterosporium phlei 



