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 
