^i 



INJURIOUS INSECTS OF 1903. 



of Hallock, thence through Mcintosh in Polk county ; thence 

 southeast through Norman, Becker and Morrison counties to 

 Little Falls; thence southeast through Mora to State Line, 

 would represent very nearly the eastern and northern boun- 

 dary of the affected portion of our state. In other 

 words, the chief part of our agricultural district is 

 in the grasp of this minute, yet destructive, insect. 

 It is not to be understood that every county situ- 

 ated in the shaded portion of the map is infested, but a very 

 large proportion of these counties are sufferers, as shown by the 

 reports of the last two years, namely, Otter Tail, Kanabec, Polk, 

 Clay, Becker, Douglas, Meeker, Marshall, Rock, Isanti, Lyon, 

 Swift, Stearns, Chisago, Washington, Dodge, Wilkins, Kittson, 

 Morrison, Lac qui Parle, Yellow Medicine, Rice, Kandiyohi, 

 McLeod, Chippewa, Stevens, Brown, Nicollet, Grant and 

 Goodhue. There are doubtless other infested counties which 

 have not been reported.. Old maps published in Government 

 Reports, showing only south part of Minnesota to be infested, 

 must be altered to include all of wheat-raising portion of the 

 state. 



The first report of injury this year came with specimens 

 from Lac qui Parle county. 



The fly has been no worse than, and in portions of the state 

 not so bad as, last year. Counties in the south and counties 

 south of west central portions are heavier sufferers than the Red 

 River country ffom Clay northward. There is no question but 

 that parasites are largely responsible for keeping this pest in 

 check, but the general freedom enjoyed this year by the northern 

 counties in the Red River Valley, in contrast to the conditions 

 which prevailed in southern portions of the state, is directly in 

 accord with the meteorological conditions prevailing in these two 

 portions. Through the courtesy of the Minneapolis office of the 

 U. S. Weather Bureau I have been furnished with a complete 

 rccgrd of weather conditions prevailing during April, May, June, 

 July, August and September in counties in north, south, south- 

 west and southeast portions of Minnesota. Following is a tab- 

 ulated statement of the conditions at these various stations : 



