113 



used for planting. Scale insects on stored yams may be 

 killed by the use of carbon bisulphide. 



BEANS. 



Beans, bonavist, woolly pyrol and other related 

 leguminous plants are subject to attacks of leaf -eating 

 caterpillars and red spider. 



Woolly pyrol used as a green dressing is often com- 

 pletely eaten down by the larvae of the woolly pyrol moth 

 (Thermesia gemmatalis, Hiibn.). The only practical 

 remedy seems to be early planting, in order that the crop 

 may be well grown before the attack becomes severe, in 

 August and September. If the caterpillars become 

 exceedingly abundant, it would probably be wise to cut 

 the woolly pyrol and turn it in, rather than allow it to 

 be eaten down. Arsenical poisons are of very little use 

 in dealing with the leaf-eating insects on leguminous 

 plants, since they very often cause as much injury to the 

 leaves as that brought about by the insects. The 



Fig. 131. The bean leaf-roller. 

 Natural size. {From U.S. Dept. Agric,) 



