Paga 22 



BETTER FRUIT 



April 



1423-24 



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Bon 56S 182 Fifth St.. San Francisco, Cal. 



Mr. Fruit Grower: 



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the diseased apples in the cellar, were 

 shown to he ;is follows: (1) From 

 heavy irrigation all season, 20 per cent. 

 (2) From medium irrigation all season, 

 10 per cent. (3) From light irrigation 

 all season, 12 per cent. (4) From me- 

 dium irrigation until August 1, then 

 heavy, 29 per cent. (5) From medium 

 irrigation in June, followed by heavy 

 irrigation in July and light in August 

 and September, 5 per cent. (0) From 

 heavy irrigation in June, followed by 

 light irrigation in July, but heavy there- 

 after, 35 per cent. The apples were 

 held in storage until the following 

 March without affecting the relative 

 contrasts above reported, and which 

 are seen to be in general agreement 

 with the results obtained the year be- 

 fore, and which further emphasized the 

 importance of heavy late irrigation in 

 the production of the disease. 



Data were also obtained in both years 

 on the amount of bitter pit appearing in 

 the various sizes of apples secured from 

 the different plots, but the details of 

 this work need not be given here. In 

 general we may say that we found 

 large apples more susceptible to bitter 

 pit than the small ones, but size could 

 not be taken as a measure of suscepti- 

 bility since we found the small apples 

 on the heavily-irrigated plots often de- 

 veloped more disease than the large 

 apples on the lightly-irrigated ones. 



The results of the various experi- 

 ments have been uniformly consistent 

 in showing that heavy irrigation favors 

 the development of bitter pit. Heavy 

 irrigation throughout the season has 

 given less of the disease than medium 

 irrigation followed by heavy, and light 

 irrigation throughout the season has 

 resulted in more bitter pit than heavy 

 irrigation followed by light. The 

 amount of irrigation in August and 

 September has apparently largely de- 

 termined the amount of disease. Sud- 

 den changes in the amount of soil water 

 do not appear to have had any effect on 

 the amount of disease. Large apples 

 have been more susceptible to bitter 

 pit than small ones, but the increase in 

 the disease from heavy irrigation has 

 been almost as great on the small and 

 medium-sized fruit as on the large. 

 Apparently apples are susceptible to 

 bitter pit not merely because they are 

 large, but rather because of conditions 

 that may sometimes accompany an in- 

 creased growth. The results as a whole 

 point to the harmful effects of heavy 



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