424 MANUAL OF FRUIT DISEASES 
spores may be found therein. Unlike the ascospores of most 
ascomycetous fungi, they are not ejected from the perithecia 
nor are they blown to the new leaves. They germinate within 
the perithecia, even while yet in the asci, their germtubes 
-emerging both through the ostiola and through breaks in 
the walls of the perithecia. At these points the germtubes 
cease growth and form conidia which are cut off and carried 
tothestrawberry and cinquefoil. The first infections of the year 
occur most commonly about the time the fruit sets; later 
ones develop throughout the growing-season. The conidia 
germinate in the presence of moisture, and the tubes penetrate 
the plant more commonly through the cuticle, rarely through 
the stomata. 
It has been shown that the mycelium does not descend to 
the roots or stems to hibernate. But, recapitulating, the winter 
is spent as follows: (1) as mycelium in the leaves; (2) as sclero- 
tial bodies on the surfaces of the leaves; (3) as immature 
perithecia in the leaves. 
Control. 
In selecting varieties for planting, avoid the more susceptible 
sorts. Set in well-drained soil, and use only healthy plants. 
‘Remove diseased leaves before setting. Spray with bordeaux 
mixture 44-50 before the blossoms open to protect the plants 
against first infections. Repeat the application two or three 
times as the occasion demands. In ordinary cases, the first 
spraying is done just after the fruit is harvested. If there is 
an unusual prevalence of leaf-spot, renew the settings annually. 
Mowing and burning after harvest will often given a new set 
of leaves which go into the winter quite free from the fungus. 
REFERENCES 
Scribner, F. L. Strawberry leaf blight. U. S. Agr. Comm. Rept. 
1887 : 334-341. 1888. 
Dudley, W. R. On the strawberry leaf-blight. Cornell Univ. Agr. 
Exp. Sta. Bul. 14: 171-182. 1889. 
