64 
COLOKADO PLxrEHIMENT STATION 
PEACH 
Scab (Clado- 
sporium corpophi- 
lum) (64) — Scab is 
one of the worst 
diseases of the 
peach. It affects 
the fruit, twigs 
and leaves. 1 1 
makes its first ap- 
pearance about 
four weeks after 
the petals fall or 
shortly before the 
ripening period. 
On the fruit small 
round greenish 
brown spots are 
formed. These 
never extend very 
Peach scab. (After Keitt.) deep illtO the flesh. 
The small spots 
may run together and form irregular lilotches. In severe cases the 
fruit is often cracked l)ecause the diseased skin does not expand to 
accommodate the growth of the fruit. 
Scab may lie controlled by spraying with self boiled lime sulfur 
(8-8-50). For eai’ly varieties only one spray is necessary. This should 
be applied one month after the petals fall. For later varieties two 
s])rays are reiinired, the second about thi*ee or four weeks after the 
first. The lime sulfur may be combined with arsenate sprays used 
to control insects. 
Brown Rot (Sclerotinia cinerea) (22), (28) — Biown rot is per- 
haps the most destructive disease of the ])each, but at present it is 
not known to oi'cnr in (Jolorado. Since it may be introduced at any 
time a descriifiion is given here. 
Brown rot affects all stone fi'uits including [)lum, apricot, cherry, 
and almond. The greatest damage is done on the fruit although the 
blossoms and twigs may also be affected. On the fruit small brown 
s])ots are first foi*med, these rapidly enlarge until the entire peach 
is decayed. Wliitish tnfts ol sporc's at*(‘ soon lornu'd ovei* tlu' 
