198 



Journal of Agricultural Research 



Vol. XVI, No. 8 



EFFECT OF IRRIGATION UPON SUSCEPTIBILITY TO SCALD 



A Study of figure 2 gives some evidence that apples from heavily irrigated 

 trees are more susceptible to scald than those from lightly irrigated ones. 

 In another experiment heavily and lightly irrigated Grimes apples of the 

 same maturity were held in commercial cold storage at Wenatchee, Wash., 

 till February 1 1 , and then in cellar storage till March 1 2 . The apples were 



stored in commercial 

 box packages, two or 

 more boxes of fruit 

 being used under each 

 storage condition of 

 each experiment. 

 The results are given 

 in Table II. 



Under all of the 

 different conditions of 

 picking the heavily 

 irrigated apples 

 showed a greater sus- 

 ceptibility to scald 

 than the lightly irri- 

 gated ones, the former 

 averaging about twice 

 as much scald as the 

 latter. There were 

 more large apples in 

 the heavily irrigated 

 lots than in the lightly 

 irrigated ones, but this fact seemed to have but little influence upon the 

 results, as heavily irrigated apples of a particular size were scalded worse 

 than lightly irrigated ones of the same size. 



Table II. — Influence of irrigation upon susceptibility of apples to scald 



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I^IG. J. — Graphs showing the relative susceptibiUty to scald of eastern 

 and western Grimes apples. The graphs show the percentage of scald 

 at the end of the given week. Those marked " E " give the results on 

 the eastern apples, those marked "WI" the results on the heavily 

 irrigated western apples, and those marked "WD" the results on the 

 western apples receiving practically no irrigation. 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. 



Expe- 

 riment 

 No. 



Variety and condition. 



Rather poorly colored Grimes apples picked on September 22 . 



Fairly well colored Grimes apples picked on October 2 



Rather overripe Grimes apples picked on October 12 



Percentage scald. 



Heavily 



irri- 

 gated. 



95 

 95 

 30 



Lightly 



irri- 

 gated. 



SO 

 25 

 10 



