HOW INSECTS AFFECT THE COTTON PLANT. 19 



COTTON SQUARE-BORER.: 



Frequently the squares arc bored by small, oval, flattened, pea- 

 green, veh-ety-haired larv<T, known as square-borers (fig. 21). Each 

 larva can destroy many squares. The larva^ transform into small 

 pupae, and when mature thes(> become the dainty little blue swallow- 



FiG. 20.— Vertical section throu!,'h the soil, .showiu^; pupa of boll worm in i! s burrow. ( l5i-;liopp ati'l Jones.) 



tailed butterflies so often seen in the cotton fields. It is seldom nec- 

 essary to take active measures against them, but when advisable 

 ])owdered arsenate of lead is recommended. 



COTTON-BOLL CUTWORM.-' 



The cotton-boll cutworm (figs. 22, 23) looks hke an ordinary cutworm 

 but it feeds by day on the foliage and bores into squares and bolls. 

 The larvse are oUve or greenisli brown and easily recognized by the 



» Uranotes melinvs Hiibn. 



» Prodenia ornithogaUi Gn^a. 



