April, 11] SWENK: INSECTS INJURIOUS IN NEBRASKA 283 



in paste form was used. This was first diluted to about the consis- 

 tency of paint. The seed was then placed in this and stirred about 

 till thoroughly covered, then spread out to dry before being planted. 

 Unfortunately the wireworms were not so abundant in the fields 

 planted, as to give an entirely satisfactory test, though some were 

 present. The germination of the corn treated in this way was all 

 which could be desired; none of it was attacked by the wireworms 

 which were present, and a good stand of corn was obtained. It 

 would now seem desirable to test this method where wireworms are 

 very abundant, to ascertain just how effective it is against these 

 pests, and it is planned to do this the present year if infested fields 

 can be obtained. It is desirable, also, to repeat these tests in other 

 parts of the country, and this article is published now in the hope 

 that the method will be tested in many places, and the waiter will 

 be glad to learn of results, from which final conclusions as to the value 

 of this treatment can be drawn. 



NOTES ON SOME INSECTS INJURIOUS IN NEBRASKA IN 1910 



By Myron H. Swenk, Lincoln, Nebraska 



■ During the past season several cases of insect injury to field crops 

 of a, severe or unusual character have engaged the attention of the 

 Nebraska entomologists, some of which will possibly be w^orth recording. 

 Among these was the yellowing and dying out, frequently to a dis- 

 tinctly serious extent, of the winter wheat during latter October, 1910, 

 in eastern Nebraska, due to the attack of wheat-root aphids. This 

 injury was not confined to a limited region, but covered the territory 

 south of the Platte west to Buffalo and Kearney counties and north- 

 ward about to Burt County, thus including most of the wheat-growing 

 area in the state. Although the impression prevailed that the Hessian 

 fly was chiefly responsible for this discoloration and dying out of the 

 wheat, and, in fact, that pest was seriously injurious in the early sown 

 fields, our investigations showed that two other factors were also ope- 

 rating to produce this same effect and that in many fields these latter 

 factors were the chief and perhaps the sole cause of injury. One of 

 these was wheat-root aphids and the other was ordinary wheat rust 

 in an unusually severe infestation. 



In some fields two, or perhaps all three, of these factors were oper- 

 ating simultaneously, so that it became extremely difficult, if not 

 impossible, to accurately determine just how much of the injury was 

 due to each, but a goodly number of late sown fields showing no con- 

 siderable number of Hessian fly puparia and not rusty or severely so 



