Family Solanaceae 349 



Symptoms. The spots are at first small, but they 

 soon enlarge. They are discolored, sitnken, wrinkled, 

 with distinct central zones, closely resembling the 

 anthracnose of apple. In moist weather the spots 

 become coated with a salmon-colored layer which 

 consists of the spores of the fungus. 



The Organism. In structure C. phontoides is little 

 different from other Colletotrichums. The setas of 

 the fungus are very numerous, thus giving the acer- 

 vuli a black appearance. The conidiophores are 

 short, and the conidia, oblong, hyalin, and one-celled 

 (fig. 66 c). 



Control. Anthracnose depends upon wet weather 

 for its activity. Spra37ing with Bordeaux is recom- 

 mended. 



Melanconium Rot 



Caused by Melanconium Tisdale Taub. 



Melanconium rot is a disease which attacks tomato 

 fruit. Tisdale' was the first to call attention to this 

 trouble which he attributed to a species of Melan- 

 conium. The writer has often had occasion to col- 

 lect this disease on tomatoes in the Bryan (Texas) 

 market. The origin of the fruits couldiiot be exactly 

 ascertained, but they were supposed to come from 

 Florida, while others were home-grown. 



Infection experiments by the author affirm the 

 parasitic nature of the organism, which is tempor- 

 arily named Melanconium Tisdale Taubenhaus. 



» Tisdale, W. H., Phytopath. 6 : 390-394, 1916. 



