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. 
REFERENCES 
Smith, R. E. California peach blight. California Agr. Exp. Sta. Bul. 
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 Cate, C. C. Spraying for peach fruit spot. Ore- 
gon Agr. Exp. Sta. Bul. 106: 4-15. 1909. 
PowbEry-MILDEW 
Caused by Spherotheca pannosa (Fries) Lév. var. Persice 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 
