288 Bulletin 276. 



cannot be done by spraying with the wind from one side of the tree. 

 It may be impossible to spray from both sides of the tree for one reason 

 or another. One should not then expect perfect results or at least 

 not blame the fungicide used. It is possible to spray a tree until the 

 solution runs down the trunk and yet not do thorough work. The 

 tips of the branches may not have been touched or those buds on the 

 opposite side of the tree from which the spray was applied may have 

 received little or no coating, even though a stream of the spray mixture 

 ran down the twig on the side toward the nozzle. High pressure is 

 an important factor in thoroughness. The only immediate test of thor- 

 ough work is to find no' buds on the trees that are not entirely covered with 

 an evenly distribut'ed coat of the spray mixture. 



(3). The fungicide used and the strength of it are of relatively little 

 importance. Repeated experiments have shown that bordeaux mixture 

 5-5-50 to 3-4-50 will control Peach Leaf Curl (Fig. 83). Lime- 

 sulfur, home-boiled, or commercial concentrate of almost any brand, 

 will do the work. The senior author showed last year that a commercial 

 concentrate (Niagara Brand, heavy grade) testing about 32° Baume, 

 diluted as much as 1-20, was fairly efiective in controlling Curl. Duggar 

 ('99) tells of the complete control of this disease by the use of lime 

 alone (plain w^hite wash) applied during January and February. Farrand 

 ('04) shows that 2 pounds of copper-sulfate alone in 50 gallons of water 

 is also entirely effective for Peach Leaf Curl. Since San Jose scale is 

 now very generally distributed and lime-sulfur therefore commonly 

 used as a winter spray, it is evident that lime-sulfur will be the com- 

 monly used specific for Leaf Curl in most of the orchards of the State. 

 In any case failure to control the disease should be laid to the fungi- 

 cide only as a last resort. It is seldom the controlling factor in such 

 failures. 



Reports of growers on the control of this disease. — Thinking that a 

 brief summary of the experiences of growers in this State in combatting 

 the Leaf Curl might be of interest, circular letters were sent out asking 

 for reports on their work with this disease during both 1908 and 1909. 

 A total of 71 reported for 1908 and 14 for 1909. 



'99. DuKgar, B. M., Peach Leaf Curl, N. Y. (Cornell) Sta. Bui. 164: 381- 

 382. 



'04. Farrand, T. A., Report South Haven Sub-station for 1903, Mich. Sta. 

 Spec. Bui. 27 :i7-i8. 



