INSECT PESTS AND THEIR CONTROL 255 



corn meal, poisoned with powdered arsenate of lead, using 2 or 3 spoonfuls 

 to a quart of meal. Early maturing varieties of corn or cotton will not 

 be so seriously injured as the later kinds. 

 Farm. Bull. 290; Bur. Ent. Bull. 50. 



The Corn Root Aphis (Aphis maidi-radicis, Forbes). A bluish-green 

 plant louse found on the roots of corn, broom corn, sorghum and on several 

 weeds. It weakens the plant, causing it to be stunted and poorly nour- 

 ished. 



Treatment. One year rotation to other crops than corn, clean cultiva- 

 tion and liberal use of fertilizers, winter plowing to break up nests of ants 

 where aphis eggs are stored. 



Bur. Ent. Cir. 86; Bur. Ent. Bull. 85, Pt. 6. 



Cotton Boll Worm (Heliothis obsoleta, Fab.). 

 See Corn Ear Worm. 



Cotton Worm (Alabama argillacea, Hbn.). A 

 dark-greenish caterpillar, striped with black, the 

 larva of a grayish-brown moth marked on the fore 

 wings with irregular darker bands. They feed on 

 the under side of leaves when young, later feeding 

 on the entire leaf and when abundant on buds and 

 tender stalks. Adults make strong flights, going as 

 far north as Canada. They feed at times on ripe 

 fruit, which they are able to puncture with strong 

 mouth parts. 



Treatment. Dust the plants with powdered ar- 

 senate of lead when the worms appear. 

 Bur. Ent. Cir. 153. 



CLOVER ROOT BORER (Hylastinus obscurus). 1 



1 Adult beetle, natural size at right. 2 Larva or grub, much enlarged. 

 3 Showing work of the borer. 



* Bur. Ent. Cir. 119. 



