318 DISEASES OF ECONOMIC PLANTS 



Anthracnose (Colletotrichum lagenarium (Pass.) Ell. & 

 Halst.). — This disease attacks all parts of the vine, 

 sometimes causing complete failure of the crop. Its most 

 conspicuous form is upon the fruit at any age, especially at 

 maturity. Here very characteristic sunken spots with pink 

 centers, much like the bean-pod spot, are produced. Upon 

 old melons they do but slight injury, but to young fruit 

 the attack is often fatal. A bitter taste is often imparted 

 to the sick fruit. 



Upon the stems while yet green the spots are irregular, 

 elongated, light brown. Tendrils, buds, and petioles turn 

 black and die. The leaves instead of yellowing, as with 

 downy mildew, are covered with dark blotches of dead 

 tissue which becomes brittle and often tears out. 



Spraying as for the downy mildew is effective. It is 

 also well to destroy infective refuse and to practice rotation. 



Downy mildew. See cucumber. 



Cercosporose. See cantaloupe. 



Alternariose. See cantaloupe. 



