INSECT ENEMIES AND PLANT DISEASES 135 



be detected by the fact that the grass dies out in the spots 

 where they are thickest. 



The surest way to rid the cornfield of grubworms is to 

 pasture it with hogs the summer before it is put in corn. 

 The hogs will root to a depth of a foot or more in search of 

 grubs. A cornfield that is hogged down is usually free from 



White Grub, (L. rugosa) 



A June bug, adult of white grub, (Lach- 



nosterna rugosa, a), last segments 



of male, from beneath 



grubs the next year. Rotating with clover and alfalfa is 

 an effective means of checking the grubs. 



The 1913 report of the United States Department of 

 Agriculture places the damage from white grubs in Iowa, 

 Wisconsin and Illinois at $7,000,000 during the year 1912. 



INSECTS ATTACKING THE STALK 



Cutworms: There are a number of species of cutworms, 

 all of which are more or less troublesome to the farmer. 

 They are mostly clumsy and greasy-looking caterpillars of 



