356 Bulletin 180. 



Conclusions. 



There is no good reason for giving up the Elberta or any other 

 variety of peach sensitive to leaf-curl, as this disease can l)e con- 

 trolled by spraying at trifling expense. 



Of the three substances employed as fungicides in these experi- 

 ments, the Bordeaux mixture is the most useful ; and, though sev- 

 eral different strengths of this mixture have been found nearly equal 

 ill efficiency the past season, for the early spraying a strong solution 

 is recommended. When Bordeaux of good strength is used early 

 and a season of warm, dry weather follows, continuing as late as the 

 middle of May, a second spraying is not profitable. But if the 

 weather is cold and wet, it is well to spray again with Bordeaux after 

 the petals fall, using only two pounds of copper sulfate (with excess 

 of lime) to fifty gallons of watei', for, notwithstanding some state- 

 ments to the contrary, the foliage of tlie peach seems sensitive to 

 stronger solutions. 



The treatment, then, for the prevention of peach leaf-curl based 

 upon my own and other experiments is briefly as follows: 



1. Spray with Bordeaux consisting of lbs. of copper sulfate, -i 

 lbs. of good quick-lime, and 50 gals, of water about the first of 

 April when the buds are beginning to swell. 



2. Spray again when the petals have fallen with Bordeaux con- 

 sisting of 2 lbs. of copper sulfate, 2 lbs. of good quick-lime, and 50 

 gals, of water. If the weather of April and early May is \varm 

 and dry, this second spraying may be omitted. 



Lime or copper sulfate alone "with water have been almost as effective as Bor- 

 deaux the p:ist season when used for the first sprayin;^ and followed later by- 

 Bordeaux, but their effects are not so lasting, particularly in rainy weather, and 

 whether the season is favorable or unfavorable, the second spraying with Bor- 

 deaux should not be omitted when lime or capper sulfate are used alone for the 

 first. 



How TO ]\[ake the Bordeaux. 



Prepare a stock solution by suspending 25 lbs. of copper sulfate 

 in a coarse sack in 25 gals, of water for a day or more until com- 

 pletely dissolved. To make 50 gals, of strong Bordeaux for the 

 early spraying, take 6 gals, of the stock solution and dilute it with 

 19 gals, of water. Weigh out 4 lbs. of the best quick-Hme, slake it 



