Colorado Plan'I' Dislasks 
77 
STRAWBERRY 
Leaf-Spot (Mycosphaerella fragariae) — This is the most common 
strawberry disease. 
Usually no great 
injury results from 
leaf-spot but the 
loss in certain in- 
stances has been 
very high. 
The spots at first 
are small red or 
purple dots which 
rapidly increase in 
size, becoming 
whitish gray in the 
center. The mar- 
gins remain purple. 
Remove and de- 
s t r 0 y diseased 
Leaf spot of strawberry. lea\eS befoie Set- 
blackberries and dew- 
berries being perhaps 
more severe on the lat- 
ter. The spots appear 
about the middle of 
June as small brown 
areas. They may become 
so numerous that an af- 
fected leaf will dry up 
and die. 
Leaf-spot may be con- 
trolled by spraying with 
either Bordeaux • mix- 
ture (4-5-50) or lime 
sulfur (1-50). The first 
application should be 
made just after the 
buds unfold and be fol- 
lowed by later applica- 
tions at intervals of two 
or three weeks until the 
• Leaf spot of dewberry. 
fruit is two-thirds matured. 
