^9^ 



Bulletin 276. 



Experiments with lime-sulfur for control of the Curl ('09). — During 

 the spring of 1909 some experiments were conducted with a view of 

 obtaining some data relative to the comparative value of bordeaux 

 and lime-sulfur and what dilution of the latter can be most profitably 

 used. The work was conducted by the senior author in the orchard 

 of Mr. L. B. Frear of Ithaca, who placed his orchards and spraying 

 apparatus at our disposal, provided room for a field laboratory and 

 helped in many ways to conduct the investigation of this as well as 

 other diseases of orchard fruits. The lime-sulfur solution used was 

 the Niagara Brand, heavy grade, some that Mr. Frear had purchased 

 early in the season. 



The bordeaux was made according to the 3-3-50 formula. The 

 experiments were conducted in two of Mr. Frear's orchards, situated 

 three miles apart; one near Ithaca, N. Y., the other near Jacksonville, 

 N. Y. The applications were made April 5th to 12th. A strong wind 

 was blowing in every case, which made it impossible to thoroughly coat 

 all sides of the twigs as should have been done to insure perfect eradi- 

 cation. From June 19th to 21st, the leaves on several limbs from each 

 of a number of trees, receiving the different treatments, were counted 

 to determine the percentage of Curl. The branches for counting were 

 chosen at random. In order to avoid any possible selection, each branch 

 was chosen with eyes closed. In the large numbers thus chosen, the 

 estimate should conform very well to the law of averages. The results 

 are recorded in the following tables. The east side of the Jacksonville 

 orchard was sprayed April 9th with the lime-sulfur, diluted 1-9. A 

 check row was left unsprayed. No bordeaux was used in this orchard. 

 The table shows the lime-sulfur to have controlled the Curl almost 

 entirely. Figures 85 and 86 are photographs of sprayed and unsprayed 

 trees growing side by side on these plats. 



Results of Spraying for Peach Leaf Curl in the Jacksonville 



Orchard 

 Table No. I 

 East side sprayed April 9, 1909 



'09. Wallace, E., Peach Leaf Curl and Its Control, Niagara Sprayer Co. Fel- 

 lowship, First Report 6-8, Oct. 19, 1909. 



