24 MONTANA EXPERIMENT STATION 



This species was unusually abundant in the upper Bitter Root valley 

 and in many local outbreaks in other parts of the State. In no 

 instance, however, was it reported as migrating. 



THE TRUE BUGiS (HEMIPTERA) 



False Chinch Bug {Jfysius ericae Schill). — Farmers have repeat- 

 edly mistaken this bug for the chinch bug and its unusual abundance 

 during the past season caused considerable alarm. Letters and tel- 

 egrams were received, stating that chinch bugs were invading grain 

 fields, but in every case the false chinch bug was the cause of the 

 scare. No damage to grain crops was found but gardens were very 

 badly injured. 



Cabbage Aphis {Aphis trassicae L.). — Cabbages, rutabagas, and 

 rape in all parts of the State suffered from the attacks of the cab- 

 bage aphis,! which was more abundant than for several years. 

 Spraying with Black Leaf 40 and soap will control this serious pest 

 of garden and field crops. 



Elm Gall Louse {Bchizoneura ainericana Riley). — Elm trees 

 in all parts of the State suffered from the attacks of this pest. In the 

 Gallatin Valley the returning fall migrants from the service-berry 

 swarmed to the elm trees by the millions, indicating that the injury 

 will be worse than ever next year. 



Fall-Grain Aphis {Macrosiphinn sp.). — Many letters were 

 received during the fall months concerning an aphid which covered 

 the heads of grain at harvest time. This plant louse attracts atten- 

 tion each fall but apparently appears too late to injure the crop of 

 the present year and does no appreciable damage to fall-seeded grain. 



Sugar-Beet Root-Louse {Pemphigus betae Doane). — This was 

 not as abundant as usual, but nevertheless caused considerable dam- 

 age in the beet-growing sections of the State. Experiments con- 

 ducted in the Yellowstone Valley show that the injury can be very 

 greatly reduced by frequent irrigations. 



Green Apple Aphis {Aphis pomi De G.). — This aphis was pres- 

 ent in considerably less than normal abundance. 



Grain Root Aphis {Forda occidenfaUs Hort.) was reported from 

 many parts of the State as abundant on roots of small grains and 

 grasses. No proof of its injuring grain has been established. 



MOTHS AND BUTTERFLIES (LEPIDOPTERA) 

 Sugar-Beet Webworm {Loxostege sticticalis Linn.). — The out- 



