Peach Leaf Curl. 295 



greatly reduces the cost of material. Even the 1-20 (table No. 2) 

 compared fairly well with the stronger solution. . Table No. 3 shows 

 some advantage in favor of the lime-sulfur treatment as compared 

 with bordeaux, the total percentage of diseased leaves being reduced 

 from 41.3 to 5.3 by the lime-sulfur diluted 1-15, and to 8.3 on the bor- 

 deaux plat. The difference was great enough to be noticeable without 

 counting. The application was made the same day and impartially. 



During the present season many growers have used the lime-sulfur 

 for Peach Leaf Curl with almost perfect results. Some unfavorable 

 reports must be expected from any treatment. In such cases, however, 

 there must be something wrong in the method or time of application. 

 It has been demonstrated beyond doubt that proper spraying will 

 satisfactorily control the disease. A strong point in favor of lime-sulfur 

 as compared with bordeaux mixture is its value as an insecticide. Of 

 course no sane man who has to combat San Jose scale would go to the 

 extra expense of an application of bordeaux for Curl. Yet, even where 

 Scale is not known to be present, the use of lime-sulfur for Curl acts as an 

 insurance against it, and may prevent the latter from gaining a foothold 

 unnoticed in some part of the orchard. We have found San Jose scale 

 in several orchards where the owners were not aware of its presence" 

 In many cases this pest becomes well established in and distributed 

 throughout an orchard before being detected. Spraying with lime- 

 sulfur for Curl may in many cases prevent much loss from the scale also. 



In our experiments only the commercial lime-sulfur solution was 

 used. There are in use at present several distinctly different kinds 

 of lime-sulfur preparations: First, the home-boiled dilute solution, 

 prepared in dilute form for immediate application as used for San Jose 

 scale. Second, the self-boiled mixture as prepared by W. M. Scott 

 ('10) of Washington, D. C, used especially as a summer spray to control 

 Brown Rot of the peach and other fungous diseases. This is prepared 

 without artificial heat for boiling, depending for its fungicidal prop- 

 erties on the sulfur in mechanical suspension. Third, the home-boiled 

 concentrated solution as prepared by Cordley ('00) of Oregon, Stewart 

 ('oq) of Pennsylvania, and Parrott and Van Slyke of Geneva ('09). 

 This is very similar in nature and composition to the f,actory boiled 

 preparation and can be prepared as a stock solution to be diluted and 



•10. Scott, W. M., & Avres, T W.. The Control of Peach Brown Rot and 

 vScah, U. S. D. A., Bu. PI. In'd. Bui. 174:15-16. 



'00. Cordley, A. B., Rural New Yorker, March, 1909:202. 



'09. Stewart, J. 1*., Penn. State College, Bui. 92:12-14. 



'09. Parrott, 1'. J., Van Slyke, L. L., N. Y. Geneva Bui. 319 & 320: 12. 

 (Pop. Ed.) 



