350 Diseases of Truck Crops 



Symptoms. The disease is found both on partly- 

 green and on ripe fruit. The spots are brown to 

 black, small, irregular, somewhat sunken, dry, and 

 superficial, with the centers slightly raised (fig. 66 

 d-e). 



The Organism. The mycelium is white, much 

 branched, and closely septate, the septation however 

 being largely influenced by food supply. The co- 

 nidiophores are straight, short, closely packed to- 

 gether, arising from a basal pseudostroma (fig. 66 f). 

 The conidia are borne singly at the apex of each co- 

 nidiophore. The conidia are Phoma-like, minute, 

 cylindrical, slightly rounded at both ends, greenish 

 white in color, and germinate by means of a single 

 germ tube produced at either end. 



Control. Nothing seems to be known of the control 

 of this trouble. Little is known of its distribution. 

 But since it has been found in Wisconsin by Tisdale, 

 and in Texas by the writer, it seems to be of wider 

 distribution than is generally recognized. Possibly 

 it is usually mistaken for other tomato troubles. 



Leaf Mold 

 Caused by Cladosporium fulvum Cke. 



Leaf mold is a tomato trouble which is very 

 troublesome under greenhouse conditions. In some 

 of the Southern States, however, it is found on field 

 tomatoes. The disease is favored by damp, muggy 

 weather. 



Symptoms. The mold appears as rusty cinnamon, 



