302 Diseases of Truck Crops 



except the roots. On the seedlings it causes a damp- 

 ing off. Young plants are attacked at the stem end 

 or an inch or two above the grotmd line as indicated 

 by a constricted area at that place. On the leaves the 

 trouble is manifested as large brown round spots 

 which later become irregular and jagged (fig. 56 a). 

 The older spots are light purple in the center and 

 surrounded by a black margin. As they enlarge the 

 spots also invade the veins, midribs, and petioles, 

 forming depressions. Diseased fruits are at first 

 soft and mushy, but later they become dry, shriveled, 

 and mummified (fig. 56 b). 



The Organism. Pycnidia (fig. 56 f) are usually 

 foimd on all parts of the plant attacked. Within 

 the body of the pycnidia and intermixed with the 

 conidiophores (fig. 56 c) and pycnospores (fig. 56 e), 

 are found filiform hooked-shaped bodies termed stylo- 

 spores (fig. 56 d) . Phomosis vexans has been erroni- 

 ously referred to as Phoma solani Hals; Phoma vexans 

 Sacc. and Syd., and Aschochyta hortorum Speg. 



Control. The seedlings in the seed bed should be 

 sprayed with Bordeaux at least once before trans- 

 planting. The plant in the field should be sprayed 

 from four to eight times with either Bordeaux mixture 

 or ammoniacal copper carbonate. 



Anthracnose 



Caused by Gleosporium melongenoB E. and H. 



Anthracnose on the eggplant attacks only the 

 fruit. The trouble js characterized by numerous 



