TOMATO DISEASES 147 



beans, beggar weed, peanuts, and the Iron cowpea. 

 The use of other varieties of cowpea than the Iron is 

 particularly to be avoided, on account of the danger of 

 stocking the land with root-knot. Fortunately, the 

 disease is serious only in sandy or light soils. 



Rosette (Corticium vagum (B. & C.) var. solani 

 Burt.) is a disease of minor importance, which occurs 

 in Ohio, Michigan, and scatteringly in other states. 

 The fungus causing it (Rhisoctonia) attacks the roots 

 and base of the stem, forming dark cankers. The ef- 

 fect on the plant is to dwarf and curl the leaves and 

 to restrict productiveness. The potato suffers more 

 severely from the same trouble. Rotation of crops 

 and liberal application of lime to the soil are advised 

 for the control of rosette in tomatoes. 



