Insect PtsTs of Intkrkst to Cotton Growers 



177 



proved of much consequence except in a few sections of the Salt 

 River Valley in 1917 where as high as 20 percent of the bolls were 

 destroyed by the pest. In cases of serious attack on cotton the 

 plants should be poisoned with i)owdorcd arsenate of lead or with 

 calcium arsenate. 



Fig. 4 — The cotton boll worm moth 

 (enlarged). 



Pig. 5 The cotton boll worm caterpillar feeding on a cotton boll. 



The eggs of the bollworm are attacked by parasites which help 

 greatly to keep the pest in control. It has many other insect 

 enemies but in a sense it may be said to be its own greatest enemy. 



