22 GENERAL INSECT CONDITIONS. 



this particular field there were 200 flies in some stage to every 

 square yard. A week or so later stalks were falling down all 

 over the field as a result of the work of the fly. 



"Bald Heads" in the wheat in large numbers at this date 

 indicated the work of a Joint Worm. This condition was 

 noted in a large number of fields visited. The pest was found 

 in barley and speltz as well as in wheat. 



Meromyza americana: The wheat-stem maggot has been 

 taken in quantities in wheat fields. 



The Army Worm has been reported to the entomologist 

 as quite abundant in various localities, and the chances are 

 that it may be worse next year. Timothy was the crop most 

 affected. This pest is discussed elsewhere. The Cottony 

 Maple Scale, Pulvinaria immmerabilis, has been again abun- 

 dant and destructive, and has been given a chapter by itself 

 in this report. Not only in Minnesota has it made its pres- 

 ence felt, but also to our certain knowledge, in Wisconsin and 

 Illinois, where many trees are claimed to have been killed by 

 its ravages. Red Clover has suffered from the attacks of 

 Brnchophagus funehris, large numbers, with their parasites, 

 having been reared from clover heads. 



The Soft Scale of the plum, Eulecanium cerasifex, is 

 becoming alarmingly abundant in Minnesota. It will be 

 found illustrated and discussed on p. 57 of this report. In 

 July willows were infested by one of the "willow worms" or 

 "willow slugs," Nematus sp., black with yellow spots. It is 

 easily combated with arsenical sprays. One of the most, if 

 not the most annoying and destructive pests in the vegetable 

 and flower garden is the Stalk Borer. It deserves, and has 

 received in this report, a special discussion on p. 61. 



The leaves of plum trees have, in localities, been destroyed 

 by the work of the Plum Leaf Gall Mite, Eriophyes padi. 

 Affected leaves appear like those shown in Fig. 14. The 



Note: The attention of the writer has been called to the fact that in his report 

 for 1905, at the beginning of the Letter of Transmittal he states that "The Hessian 

 Fly has been present on grains and grasses," etc. A search thru his 1905 notes 

 failed to disclose any authority for such a statement, and we are forced to the 

 conclusion that it was a bit of carelessness which was overlooked in proof-reading. 

 We have not found this pest breeding upon anything but wheat, rye, and barley, 

 nor, according to recent letters from workers who are making a detailed study 

 of this pest, has it as yet been reared from any but these last-named plants. 



