DISEASES OF CULTIVATED PLANTS 387 
and young shoots. The mildew fungus (Sphaerotheceia Oxyacanthae (DC.) De By.) 
is a very interesting one. This applies especially to amateur microscopic 
study. If spraying is required for the mildew two applications will probably 
be very satisfactory. 
Cherry-Rot or Brown-Rot (Schlerotinia (Monilia) 
Sructigena (Pers.) Schw.) affects all stone fruits, 
including peach, 
plum, apricot, etc. 
It is by far the 
most serious and 
baffling of cherry 
diseases to the 
commercialcherry 
grower. Thedecay 
of the fruit is 
caused by the 
fungus named. 
The conditions of 
the season may 
favor or retard 
the spread and 
development of the 
fungus. The 
threads of the 
fungus (mycel- Fig. 42, Cherries, sound and rotted. 
ium) survive inthe ‘The parasite in this case is the same as on 
rotted fruits, other stone fruits. 
Fig. 41. Leaf of cherry which may hang 
attacked by leaf-spot fungus. Gy the trees unless removed. Careful removal of all 
The dead areas in cherry - E 
leaves turn dry and rarely give rotted fruit and spraying for the fungus, as per the 
shot-hole effects. The same calendar, may be relied upon to save a part of the 
fungus occurs upon the plum. fruit, but judgement and attention to the details of 
From: Bulletini79. the work are always required. Itis to be under- 
stood, also, that checking the curculio is a sure means of helping to check rot. 
CHESS 
Anthracnose. The anthracnose fungus (Colletotrichum cereale Manns. 
attacks the chess as well as the cereals in which it may grow. The disease is 
of interest upon chess because it may be a source of extending the development 
of anthracnose. (See anthranose of oats, rye and wheat). 
CHESTNUT 
Anthracnose is a disfiguring spotting of chestnut leaves, about which 
inquiries are often made. Small, dead areas with characteristic borders are 
produced by this fungus (Marsonia ochroleuca B. & C.). Such applications of 
fungicides as are made for shot-hole fungus of the plum and leaf-spot of the 
horse chestnut, will be found useful when treatment becomes necessary on the 
chestnut. 
Bark Disease. A serious bark disease of chestnut in the east has recently 
been described and has proved injurious. The fungus (Diaporthe parasitica 
Murr.) appears to enter as a wound parasite through openings in the bark. It 
has exterminated a part of the chestnut trees in the eastern half of Long Island 
and about New York City. (See Yearbook, U. S. D. A., 1907, pages 489-490, 
also Bulletin, Bureau of Plant Industry, No. 121, 1908). The beginnings of the 
