132 Diseases of Greenhouse Crops 



borne on the under side of the leaf, light brown, and 

 in clusters. The conidia are hyaline, 3 to lo septate, 

 cylindric (fig. 19, b.). 



Control. Early blight as well as late blight may 

 be controlled by spraying with Bordeaux mixture. 

 The Boston Market and Golden Heart varieties 

 should be avoided because of their susceptibility to 

 the disease. The White Plume seems to be resist- 

 ant. 



