314 MANUAL OF FRUIT DISEASES 



regarded as the best fungicide available at present. This 

 autumn application alone has been effective under California 

 conditions, and it may also prove entirely satisfactory for Ore- 

 gon orchards. The present recommendations, however, for 

 Oregon conditions include supplementary sprayings in the 

 spring, using self-boiled lime-sulfur 8-8-50. Two applications 

 are made as follows : (1) May tenth ; (2) June first ; if the 

 disease is unusually prevalent and the weather rainy, the 

 second spring application may be made about May 20 or 25, 

 and a third spraying about June 5 or 10. 7, ? 



REFERENCES 



Smith, R. E. California peach blight. California Agr. Exp. Sta. Bui. 

 191 : 73-98. 1907. 



Jackson, H. S. Peach diseases. California peach blight and fruit 

 spot. Oregon Crop Pest and Hort. Bienn. rept. 1911-1912 : 

 255-257. 1913. 



Cordley, A. B., and Gate, C. C. Spraying for peach fruit spot. Ore- 

 gon Agr. Exp. Sta. Bui. 106 : 4-15. 1909. 



POWDERY-MILDEW 

 Caused by Sphcerotheca pannosa (Fries) Le"v. var. Persicce Woronichine 



It was formerly believed that the peach and rose mildews 

 were the same, but recently it has been shown that the two are 

 not absolutely identical. The peach powdery-mildew probably 

 occurs also on the nectarine. 



This disease is undoubtedly world-wide in its range, and 

 has been found occasionally in the United States since 1886. 

 It affected peach trees in that section of the country about 

 Maryland and Delaware from 1886 to 1891, occurring annually 

 during those years. In 1891 the disease was observed in Michi- 

 gan and Georgia, and three years later, 1894, it was reported 

 as causing serious damage in western New York. As a rule, 

 however, this disease is of relatively little consequence in New 



