390 



SOUTHERN FIELD CROPS 



of which usually 

 feed upon corn. 

 The first and second 

 generations feed on 

 the young leaves in 

 the bud or growing 

 part of the corn 

 plant ; the third 

 generation preys 

 chiefly upon the 

 ears of corn in the 

 green or roasting- 

 ear condition, when 

 the insect is known 

 as the corn ear- 

 worm or roasting 

 ear-worm. This in- 

 sect prefers corn to 

 cotton. Hence it 

 remains on corn as 

 long as the, ears are 

 green. After the 

 greater part of the 

 corn hardens, usu- 

 ally in July, and 

 after the third and 

 more numerous 

 generation of worms 



appears, severe injury is done to the squares and bolls 



of cotton. 



360. Preventive measures. — In spite of the great 



Fig. 168. — The Cotton Boll-worm on the 

 Outside op a Cotton Boll. 



The mass of insect castings near the top of 

 the picture suggests the injury already done to 

 the interior of the boll. 



