20 



GRASSHOPPERS AND OTHER INJURIOUS INSECTS OF 1911 AND 1912. 



ish, inasmuch as the oil reaches the spiracles, many long-winged 

 forms do not die because of the protection to the spiracles afforded 

 by the wings. This shows the importance of the early use of the 

 hopperdozer, before wings are attained. 



We have not advised the burning over of fields alive with young 

 hoppers, believing the same to be dangerous and of questionable 

 abiliay in a country where a hay crop is an important feature. In 

 emergency cases, however, it may well be resorted to. We encour- 

 age co-operation, and we have especially advised action against 



Fig-. 14. A crude and cheap Hopperdozer. 



grasshoppers, and vigorous action, when they first appear, even if it 

 interferes with other farm work, for we find that whatever plan we 

 follow as regards this pest, that they are much more easily handled, 

 as would be expected, when they are young, than when they have 

 attained their wings. 



Our field workers repoited only partial success with poison baits, 

 represented by poison bran mash and Griddle Mixture, but have, in 

 the course of their work, hit upon a rather unique poison which they 

 have courteously called the "Minnesota Mixture." Finding that 

 arsenite of soda used as a spray, and combined with a little molasses, 



