EEPOET OF ENTOMOLOGICAL WORK OF THE SEASON OF 



1891. 



By F. M. Webster, Special Agent. 



LETTER OF SUBMITTAL. 



Columbus, Ohio, October 10, 1891. 

 Sir : I herewith submit my annual report for the current year. My last report 

 preceding this related to the development of the Hessian Fly, and especially as show- 

 ing the desirability of late sowing as a means of warding off the fall attack. It 

 seems, however, that where the carrying out of this advice leads to a procrastination 

 in the preparation of the ground it is likely to lead to injurious effects, where wheat 

 is to follow clover. I have, therefore, prepared the accompanying report in order to 

 show the nature of another class of depredators, and how it is, doubtless, possible 

 and practicable to follow out the directions as to late seeding and still avoid contact 

 with this second evil. 



Yours very respectfully, 



F. M. Webster, 



Special Agent. 

 Dr. C. V. Kiley, 



U. S. Entomologist. 



INTRODUCTION. 



During the fall of 1890, after the rendering of my annual report for 

 that year, I was engaged in the study of various insects, notably those 

 affecting young growing grain. On February 2, 1891, I started on a 

 tour of investigation through Arkansas and Texas, in order to continue 

 work begun by me in 1886, relative to the occurrence and effect of vari- 

 ous species of Simuliuni infesting the streams of the valley of the lower 

 Mississippi, and also to investigate the depredations of the Grape Cur- 

 culio in northwestern Arkansas. From the 20th of February to the 1st 

 of April I was in Texas engaged in further studies of Siinuliuin and 

 grain insects. A report of the work of this trip has been forwarded 

 you and published in Insect Life. Soon after my return, in accord- 

 ance with your direction, I visited the farm of Dr. I. W. Chamberlain, 

 at Hudson, Summit County, Ohio, to investigate an occurrence of the 

 Clover Hay-worm. A report of this and further investigation of the 

 species involved has been' forwarded to you. Further investigations, 



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