170 Diseases of Greenhouse Crops 



Anthracnose 



Caused by Glomerella piperata (E. and E.) S. 



Anthracnose is a serioiis disease which is usually 

 confined to the fruit. Its symptoms are character- 

 ized by round, soft, sunken, pale spots (fig. 34, 

 a). The summer or conidial stage is known as 

 Gleosporium piperatum E. and E. and is found as 

 salmon colored pustules abundantly scattered over 

 the spots. The ascospore stage may develop in pure, 

 cultures of the fungus. 



Black Anthracnose 



Caused by Colletotrichum nigrum E. and H. 



This form of anthracnose differs from the disease 

 described above only in that the spots turn jet black. 

 The trouble attacks the young as well as the mature 

 fruit. The winter or ascospore stage of the causa- 

 tive fungus has not as yet been found. It is very 

 probable that the fimgus (fig. 34, b-c) is carried 

 over as viable mycelium on the infected fruit left 

 over in the field. Both forms of anthracnose may 

 be controlled by spraying with Bordeaux mixture. 



Fruit Spot 



Caused by Macrosporium sp. 



This disease, which is as important as anthracnose, 

 attacks the fruit at the blossom end. The peppers 

 that are attacked are half rotted, black, and moldy'. 



