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PROGRESS REPORT ON THE EUROPEAN CORN BORER 67 
EXTENT OF INJURY AND INFESTATION IN WEEDS AND GRASSES 
Injury to the weeds and wild grasses (figs. 3 to 5) serving as hosts 
of the European corn borer (Table 1) is not commercially important, 
but the infestation of such weeds and grasses affords abundant oppor- 
Fig. 31. — Hungarian millet infested by European corn-borer larvae 
tunity for the multiplication and spread of the pest in fields where 
corn or other economic plants are not grown or in cultivated fields 
where the borers are so numerous that they are compelled to feed 
upon these weeds or grasses in order to complete their growth. The 
infestation in such plants is most pronounced in the New England 
