THE HESSIAN FLY. 45 



1849. 



Very general and destructive in some of the counties of New 

 York Oswego, Albany, and Columbia Counties. Ravages great 



in Ohio. 



1850. 



Disappearing from parts of Ohio, also from parts of Michigan. 

 " The Hessian fly, one of the enemies to our wheat growers, 

 visits us at intervals of from four to six years, continuing its 

 ravages through two or three seasons, and then apparently dis- 

 appears."^) 



1851. 



General improvement in Pennsylvania and Maryland ; Hes- 

 sian fly not troublesome. Virginia much improved ; the fly 

 " scarcely dreaded." No Hessian fly in Gallea County, Ohio ; 

 disappearing in Oakland County, Michigan, " for years." Not 

 troublesome in Indiana ; general insecurity from its ravages. In 

 Buckingham County, Vermont, 1851, the Hessian fly had almost 

 disappeared, and from its great diminution the farmers thought 

 they could sow their wheat in September, which resulted in the 

 immediate increase of the fly, and a consequent falling back to 

 late sowing and proper preparation of seed. 



1852. 



Hessian fly attacked wheat in Fauquier County, Virginia, when 

 sown before October. The same in Buckingham County, Ver- 

 mont. Not known to any extent in Penobscot County, Maine. 



1853. 



Committed great ravages in some parts of Pennsylvania 

 Centre County and Clinton County. 



1854. 



Visited Niagara County, N. Y. " The Hessian fly is another 

 enemy of ours, and in trying to get an early crop of wheat by 



(1) Northville, Wayne County, Mich. J. D. Yukes, P. O. R.,1850. 



