Jan. 21, 1918 Irrigation Experiments on Apple-Spot Diseases 



113 



The results make it evident that heavy irrigation favored bitter-pit, 

 and also increased the size of the apples. It can be seen that there is 



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Fig. I. — Diagram showing the soil-moisture conditions in irrigated plats of Gano apples in 1914. The 

 results show the average percentage of saturation for each half month based on the average of soil samples 

 at depths of 24 and 36 inches. 



a very close relation between the size of the apple and the amount of 

 the disease, but there is hardly sufficient parallelism to justify the con- 

 clusion that the increase in bitter-pit is entirely due to increase in size. 



