220 INSECTS 
in the central states. In the spring wheat section the adults 
begin their campaign in May by laying their eggs on the young 
plants. The larve, which appear soon after, work their 
way in between the leaf and the young stalk, feed upon the 
sap three or four weeks, and then change into the pupa state. 
If very numerous, the plants become weak and sickly. Ina 
few days the second brood of adults appears and soon these 
lay their eggs, each brood being more 
numerous than the one before. The in- 
fested stalks break or bend over just 
above the second joint where the insects 
have been feeding, and the heads, which 
contain very little grain, are lost. 
The adult Hessian fly has two wings 
and looks like a very small mosquito; the 
pupe look like flax seeds but are smaller 
and narrower; the larve are white. The 
insects pass the winter in the stubble in 
the pupa state, and therefore the remedy is to plow or burn 
all the stubble in the fall or very early in the spring. A few 
acres of infested stubble are sufficient to supply a large 
section with the pest the next season. In winter wheat 
sections the above history is somewhat different, .as the insects 
make their first attack in the fall after the grain is up. 
HEssIAN Fiy 
Magnified. 
