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



123 



But little bitter-pit had developed on any of the apples during the 

 three months of cellar storage. This may have been because the sus- 

 ceptible apples had already been eliminated, or may have been due 

 to the fact that the apples were in an open package and finally became 

 slightly shriveled. The relative amounts of disease on the apples from 

 the various irrigation plats is little different from that given in Table I. 

 The results for the season are shown in the last column of Table VII 

 and also in figure 8. 



EXPERIMENTS ON JONATHAN APPLES IN I916 



The bitter-pit experiments were continued in 191 6 in the Jonathan 

 orchard already described. The irrigation conditions were much more 



yIPPLSS PICk£0 ^SPTEMBEff \S 



APPLES PICKED OCTOBER I. 



mi 



■ PEO CENT OF BITTER-Pir DEVELOPED BY NOV. /O. 



3 PEP: C^ENT OF BiTTEP-PtT DEVELOPED BETWEE^t NOV.IOANO FEB-T 



c 



Fig. 8.— Diagram showing the amount of bitter-pit on Jonathan apples in 1915. The solid portions of the 

 bars indicate the percentage of apples affected with bitter-pit on November 10. the white portions the 

 percentage developed between November 10 and February 7. All of the percentages are based on the 

 number of apples at the beginning of the experiment. See figure 7 for soil-moisture conditions. 



satisfactory than in 191 5. The percentages of soil saturation main- 

 tained on the different plats are shown in figure 9. 



All of the trees were in vigorous condition except those of plat 3, 

 which were apparently suffering from the effects of the drouth of 191 5. 

 The apples of this plat were very highly colored, while those of plats 

 5 and 7 were rather low in color. The first picking was made on Septem- 

 ber 22 and a second on October 2. The apples of the first picking were 

 undercolored and immature, while those of the second were well colored 

 and suited for commercial picking. Approximately 3 bushels of apples 

 were saved from each plat in the first picking, and approximately 2 

 bushels from each in the second, and placed in cellar storage. There 

 was no bitter-pit on the apples at picking time and none had developed 

 by October 24. The results obtained from notes taken on November 14 

 27806°— 18 2 



