Tomato Diseases 



191 



The Trophy and Ficarazzi are very susceptible 

 varieties. 



The Organism. The mycelium of Septoria lyco- 

 fersici is hyaline and septate. The pycnidia are 

 gicbose; the pycnospores are hyaline, needle-shaped, 

 many-septate, and lose their vitality when exposed 

 to ordinary room temperature for about four days. 



Control. The disease often starts on the seedlings 

 in the seed bed. It is important, therefore, to start 

 with a clean seed bed soil. Seedlings should be 

 sprayed with 4-4-50 Bordeaux before being trans- 

 planted. In the house, the plants should not be 

 worked when wet. Spraying with 4-4-50 Bordeaux 

 IS recommended. 



Anthracnose 



Caused by Colletotrichum phomoides (Sacc.) 

 Chester. 



Anthracnose is a disease to which ripe tomatoes 

 are especially subject. The losses are often con- 

 siderable both in the house and in transit. 



Symptoms. The spots are at first small, but they 

 soon enlarge. They are discolored, sunken, 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. phomoides is lit- 

 tle different from other Colletotrichums. The seta 

 of the fungus are very numerous, thus giving the 



