Tomato Diseases 189 



swarm spores. Chlamydospores are common, oospores 

 frequent on cornmeal agar. Besides tomato fruit, P. 

 terrestria causes a foot rot of citrus trees and a stem 

 rot of lupines. 



Control. Fruit destined for distant markets 

 should not be packed as soon as it is brought in from 

 the house. If possible it should be kept a few days 

 to allow for possible rot to develop so that the af- 

 fected ones may be culled out and destroyed. Spray- 

 ing with Bordeaux mixture is also recommended. 



Leaf Spot 



Caused by As cocky ta lycopersici Brun. 



This disease is of common occurrence but of lit- 

 tle economic importance. It produces brown circu- 

 lar spots which enlarge and change to grayish brown 

 in color. 



Fruit Rot 



Caused by Phoma destructiva Plowr. 



Symptoms. On the fruit the disease is character- 

 ized by conspicuous dark spots on the side and at 

 the stem end of both green and mature fruit. On 

 the surface of the largest spots, numerous dark 

 pycnidia may be seen. Besides attacking the fruit, 

 the disease may also infect the foliage, causing dark 

 spots which resemble those on the fruit. Affected 

 leaves shrivel, droop, and sometimes drop off. The 

 disease seems to be unable to attack potatoes or 

 peppers. 



