Feb. 24, 1919 



Apple-Scald 



197 



The results at the higher temperature are in agreement with those of the 

 preceding year, indicating little difference in susceptibility to scald 

 between the well -colored and poorly colored Grimes, but at 0° the latter 

 finally developed about twice as much scald as the former, giving further 

 evidence of the greater susceptibility of green fruit when held at tempera- 

 tures low enough to prevent ripening. 



30 





I 

 I 



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 / 



EASTERN AND WESTERN FRUIT 



Experiments were made to determine the relative susceptibility to 

 scald of eastern and western Grimes of practically the same degree of ma- 

 turity. The western 

 Grimes were shipped 

 from Wenatchee, 

 Wash., to Washing- 

 ton, D. C, in well- 

 iced pony refrigera- 

 tors. The eastern ap- 

 ples were placed in 

 storage the day after 

 picking. Part of the 

 western apples were 

 from trees that had 

 been heavily irri- 

 gated. These apples 

 were large, most of 

 them 3 to 3X inches 

 in diameter. The re- 

 mainder of the west- 

 em apples were from 

 trees that had re- 

 ceived very little ir- 

 rigation and were 

 small, ranging from 





Fig. I. — Graphs showing the effect of maturity upon susceptibility of 

 Grimes apples to scald. The graphs show the percentage of scald on the 

 two lots of apples at the ends of 8 and i6 weeks, respectively. The ones 

 marked " G " give the results on the iruit picked on August 2 1 and those 

 marked " R" the results on the fruit picked September 14. The dotted 

 lines show the percentage of scald after the apples had been removed 

 from storage and had stood in the laboratory at a temperature of 20° C. 

 for three days. 



2X to 2% inches in 



diameter. Most of the eastern apples were from 2K to 2K inches in 

 diameter. All of the apples were held in moist chambers in the storage 

 boxes already mentioned. Ten apples were used in each test. The results 

 are shown in figure 2. 



The heavily irrigated western apples were somewhat less susceptible 

 and the lightly irrigated ones much less susceptible to the disease than 

 the eastern apples. While the eastern and western fruit did not receive 

 exactly the same treatment, the results as a whole indicate that western 

 Grimes apples from a region of intense sunlight are less susceptible to 

 scald than eastern apples of practically the same maturity. 



