INJURIOUS INSECTS OF 1903. 



TABLE NO. I— Continued. 



May. St. Cloud, Stearns 59.0 



June. St. Cloud, Stearns 64.2 



July. St. Cloud, Stearns 67.8 



August. St. Cloud, Stearns 63.6 



September. St. Cloud, Stearns 56.1 



Total 62 . 7 



May. St. Paul. Ramsey 59.4 



June. St. Paul, Ramsey 65.4 



July. St. Paul, Ramsey 69.6 



August. St. Paul, Ramsey 05.9 



September. St. Paul, Ramsey 58.7 



Total 63.8 24.79 52 61 



It is well known that the Hessian Fly, unlike the Chinch Bug, 

 needs cool, moist weather for its development. Many warm, dry 

 days while it is in the immature stage are fatal. It will be seen 

 by looking at the above table that Kittson county, for example, 

 had less rain and more sun than the southern counties. We 

 would therefore expect that the fly would be less numerous and 

 less destructive there than in the south, which was the fact. An 

 assistant visiting Warren on August 5th reported "flax seeds" 

 in small numbers, and the per cent of grain down, both at 

 Warren and Mcintosh, from this cause to be very small. 

 Working south, he foimd "flax seeds" much more numerotts in 

 Clay county. 



By farthemost interesting fact discovered this yearinregard 

 to this pest is the very evident proof that there is more than one 

 brood in Minnesota. My esteemed predecessor, Dr. Lugger, 

 declared there was only one brood here. He is quoted as say- 

 ing: "Not one fly issued from stalks gathered as soon as injury 

 became visible. * * * This assuredly seems to indicate 

 that the flies do not issue during the autumn as they do farther 

 south, but remain in the culm until spring." He further found 

 no lan'oc or pnparia in volunteer zvheat plants growing near fields 

 I'.'Jiich had been badly infested. 



