habit. ^Vith ivspoi-t to thoir ooonoiuir misohiel". there i^ probably little 

 to eluHK^e between those insects which, by destroying or weakening the 

 plant, preveiit the development of the ear or diminish it^ size and those 

 which destroy the mature product. One ileprives the farmer of the 

 reward of his labors and investments as com[iletely as the other. 



Genekal Measures of Prevention ANr> Remedy. 



From what has been said above witl\ res|)ect to the starvation effect 

 of most insect injuries it follows that any management which helps to 

 maintain and strengthen the plant by furnishing it better or more abun- 

 dant food will lessen, or perhaps wholly prevent, losses from insect injurv 

 which must otherwise be serious or complete. A strong, rich soil, well 

 cultivated, well watered, and well dmined. may grow a good crop not- 

 withstanding an amoimt of infestation by chinch-bng-s. root-lice, root- 

 worms, and white grubs which would be fatal on poor or poorly manag-ed 

 land. The goiid corn farmer may thus escape with a profitable yield 

 under insect attacks which will leave his less intelligt^nt or less cai-eful 

 brother in debt after his crop is harvested. This is not merely because 

 the vigxnvus plant will easily support an amount of injury under which 

 the unthrifty one will sutYer or succumb. It is an established fact that 

 many insects then\selves will not thrive as well or multiply as rapidlv 

 on a vigorous. (|uickly growing plant as on one in feeble condition. 



Moro special measures aro a proper rotation of crops, such that corn 

 shall not be exposal to injury by insects wliich have bi*ed on the same 

 ground the proceiling year, either in other croj>s or in corn itself: timely 

 plowing, to forostall the breeiiing of insects by destroying them or their 

 food: timely planting, with roferonce to the period of the greatest abun- 

 dance or gi-eatest activity of certain species: and the use of barriei-s 

 ag-jiinst the movement of certain destructive sj^ecies into the corn from 

 fields adjacent, combined with insecticide measures against hoixles or 

 companies of destructive insects, which if left to themselves will work 

 givat and immeiliate harm. 



Insect Injuries to Different Parts of thk Corn Plant. 



7'() the Leairs. — That the abundant, conspicuous, and easily- accessible 

 foliag-e of the corn plant should attract a larg-e numl>er of hungry insects 

 and sutYer moiv from their attentions than any other part, is naturally 

 to be expected, since, as a consequence of its gradual and long-continued 

 growth, it otTers for consvuuption during many months the nkxjt succu- 

 lent and nourishing food which the plant produces. 



More than one hundreil sj^^ecies of insects, representing all of the 

 oi\lei-s injurious to corn. have, in fact. Ixx^n found feoviing on the leaves. 

 The uH^st important differences in their injuries aiv due to dififerences in 

 the moutli-parts of the insects — whether sucking or biting — and the 



