PROGRESS EEPOET OX THE EUROPEAN COEX BOEER 
33 
Fig. 14. — " Close-up " of dent field corn ear and stalk, 
showing typical injury by the European corn borer. This 
experimental plat showed an average of 2.5 per cent 
grain injury, 62.2 per cent ears infested. 100 per cent 
stalks infested, with an average of 15.5 larvae per plant. 
Cambridge, Mass., October, 1920 
Fig. 15. — Hill of flint field corn, showing severe European 
corn-borer infestation. Note broken-over stalks and ear 
lying on the ground. Cambridge, Mass., October, 1920 
25411°— 27- 
