CoLOKADO Experiment Station 
that its market value is greatly lessened. On the leaves irregular 
reddish brown spots are formed which may fall out causing a shot- 
hole appearance. * 
Blight is caused by a fungus that grows in the tissues of the 
tender twigs, leaves and fruit. Spores are formed in the spots, 
which when blown about by wind, are means of spreading the 
disease. The fungus lives over the winter on infected twigs. Spores 
are produced until late in the fall. The most destructive infection 
takes place during the months of December and J anuary when the 
fungus grows directly into the developing buds. 
Blight may be controlled by spraying with Bordeaux (5-5-50) in 
the fall not later than December 15. A second application should 
be made in the early spring just before buds open. 
Mildew (Sphareotheca pannosa) (65) — Mildew is a common dis- 
ease of the peach in Colorado. The leaves, twigs and fruit are at- 
tacked. Irregular white powdery blotches are formed causing the 
leaves to curl and crinkle and the bark of the twigs to turn brown 
and dry. Similar white blotches are found on the fruit, cheeking its 
development and causing the flesh to become dry and hard. 
To control mildew spray with lime sulfur solution or dust with 
flowers of sulfur. A close watch should be kept for the first appear- 
ance of the fungus, when the first application should be made. Later 
applications should be made at intervals of ten days or as often 
as necessary. 
Powdery mildew of peach. ^Original in Bulletin 107, by Whipple.) 
