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Colorado Experiment Station 
(5) Do not allow livestock to roain over infested fields, for they 
carry the organisms to non-infected fields. 
(6) Diseased plants should be pulled up and destroyed. 
CANTAEOUPE. 
Leaf Blight or “Rust." —This disease is more properly 
termed “blight." The name “rust" is suggested by the rusty ap¬ 
pearance of the leaves due to the numerous brown spots with which 
they are covered. These spots are circular; they first appear on 
leaves in the center of the hill. They may enlarge as the disease 
progresses, and several may run together, causing a curling and 
death of the leaf. Frequently the disease occurs on stems. 
Moist weather tavors the spread of blight. Affected plants ripen 
their fruit prematurely, thus destroying the flavor. 
Control .— (i) Use resistant varieties. 
(2) Rotation of crops. This is highly advisable. 
(3) Spray with 4-5-40 Bordeaux, first when the vines begin to 
run, followed by i or 2 more at intervals of 10 to 14 days. 
CARROT. 
Soft Rot. —This is a bacterial disease which causes a soft rot 
of many vegetables. Decomposition usually begins either at the 
crown or root tip, and progresses rapidly through the core. Bacteria 
enter the fleshy tissue through wounds. Lengthwise sections of dis¬ 
eased roots show a softened, watery, decayed portion which is usu¬ 
ally brown. There is a sharp line of division between the decayed 
and sound tissue. 
Control .— (i) Treatment must aim entirely toward prevention. 
(2) Rotation of crops is advised, with such crops as the grasses, 
cereals, etc. 
(3) Use manure that is free from refuse of diseased plants. 
(4) Dry the root surface before storage. The roots should 
be left on the surface of the ground, exposed to the sun, a few days 
before storage. Store in a dry and well ventilated place. The or¬ 
ganism cannot endure drying nor can it invade dry tissue. 
(5) Cold storage is advised at a temperature between 39 and 
50 degrees F. This temperature, coupled with the disinfection of 
the root surfaces by drying and sunlight, should prevent serious in¬ 
jury from the rot. 
CELERY. 
Blight.— There are two distinct blights of celery, early blight 
and late blight. Botli diseases are due to fungi which feed upon the 
leaves, and in some cases the stems. The organisms causing the 
two diseases are entirely different. The effects of, and the reme¬ 
dial measures for the two are similar, however. 
