Fungous Diskasks of' Colorado Crop Plants 29 
Control .— (i) Cut out and burn all diseased plants as soon as 
the trouble appears in the spring. 
(2) All cuttings for planting should be made from stock that 
is known to be healthy. Do not even take cuttings from plants that 
appear healthy when such plants stand in a plantation known to 
have diseased plants. 
(3) Spraying is not recommended. 
Currant Leap Spot. —Diseased spots are about one-eig‘hth 
of an inch in diameter and more or less angular. They have grayish 
centers with brown borders. Minute black specks may be seen on 
older diseased areas within the grayish center. Spots may be few 
or numerous. In the latter case, the leaf turns yellow and falls. 
Serious defoliation may result. This spot is easily distinguished 
from the anthracnose leaf spot by its larger size, its well-defined 
area, and its gray center, usually with black specks. Anthracnose 
leaf spots are black and small. 
Control .—See anthracnose of currant. 
Anthracnose. —This disease attacks fruit, fruit-stems, new 
canes, leaves and leaf stalks. Newly developed spots on the berries 
are rather noticeable. As the berries ripen, spotted fruits are less 
conspicuous. This is probably because the worst affected fruit 
has dropped. The spots on fruit are black, circular, and resemble 
fly specks. Affected berries do not rot or wither. Spots on 
the fruit-stems are black, and slightly sunken. They are from one- 
fourth to one-half of an inch in length and extend half way or more 
around the stem. Spots on new canes are rather inconspicuous. 
They are pale yellow or light brown, therefore almost the color of 
the cane. A slight discoloration of the bark is produced. The lower 
leaves are attacked first. They become thickly covered with small, 
dark brown spots. Affected leaves turn yellow and fall. Spots on 
the leaf-stalk are conspicuous. They are black and slightly sunken. 
Diseased plantations are easily recognized by the yellow color of 
the foliage. At ripening time the diseased leaves fall, leaving the 
vines bare, and exposing the red fruit. 
Control .— (t) Spray with Bordeaux mixture, 4-5-50 formula, 
or lime-sulfur, i to 50. 
(a) First application, made on bare canes before the leaves 
appear. 
fb) Second application, made while the leaves are unfolding 
fc) Later applications, at intervals of from two to three 
weeks, until the fruit is two-thirds grown. 
FLAX. 
Wilt. —-The cause of flax wilt is a fungus which grows on the 
inside of the flax plant. It is found that the roots of diseased plants 
