PEOGEESS EEPOET ON THE EUEOPEAN COEN BOEEE 
17 
♦ 
It is probable that some of the plants recorded as hosts of P. nuhi- 
lalis in the Old World serve primarily as shelter plants rather than 
as food, a condition which is known to prevail in the infested areas 
of America. 
HOST PLANTS IN AMERICA 
In general, corn appears to be the preferred host of the European 
corn borer in America and is more seriously injured by the insect 
Fig. 3. — Cocklebur (Xan-thium sp.), a susceptible weed host of the European corn 
borer 
than any other cultivated crop attacked. This includes sweet corn, 
field corn (both dent and flint), and pop corn. In the heavily in- 
fested area of eastern New England the pest also attacks and fre- 
quently causes serious injury to a great variety of other economic 
plants, including several of the field crops, vegetables, flowers, and 
25411°— 27 2 
