Nov. 26, 1921 Temperature Relations of Stone Fruit Fungi 



461 



perature than that at which the fruit was finally held. A study of the 

 figures brings out the facts that with Monilia i day at 25° C. followed by 

 I day at 10° results in as large spots as 5 days at 10°; i day at 20^ 

 followed by i at 10° results in as large spots as 4 days at 10°; i day at 

 25° followed by i at 7^2°, in as large spots as 6 days at y}4°', i day at 



Fig. 18.— Monilia on peaches. A summary of the experiments on brown rot obtained by averaging the 

 percentages of figures 3, 4, 5. and 6. 



25° followed by i day at 5°, in as large spots as 10 days at 5°; i day at 

 25° followed by i day at 2X°, in as large spots as 12 days at 2^2°. It 

 will also be seen that with Rhizopus i day at 25° followed by i day at 

 10°, or I day at 15° followed by 4 at 10°, results in larger spots than 7 

 days continuously at 10°. 



80 



I 



L 



<w 



'?-0/9y,s 



\g£i9y,S 





£0 



Fig. 19. — Rhizopus on peaches. A summary of the experiments on Rhizopus rot obtained by averaging 

 the percentages of figures 8, lo, 13, 14, 15, i6, and 17. 



Peaches inoculated with Monilia and promptly cooled to 2^°, 5°, 7>^°, 

 or even 10° C. have had but little or no rot at the end of 3 or 4 days, but 

 similarly inoculated peaches delayed at 25° for i day» before storing at 

 these lower temperatures have developed so much rot by the end of the 

 fourth day after inoculation that they were commercially worthless. 

 Peaches inoculated with Rhizopus and promptly cooled to 10° have been 



