FIFTEENTH AXNCAL BEPORT OF STATE ENTOMOLOGIST 1^7 



leaves early in the suminer. and in many cases the exuded honev dew- 

 is a considerable nuisance. 



Fall-Grain Aphis (Jlacj-osipJiiiDi sp.). There were inquiries 

 regarding a species of aphis which was found on heads of nearly 

 ripened wheat. It turned out to be a species of Jfacrosiphuvi, which 

 is commonly found on wheat in the late summer but which appar- 

 ently does no damage. 



The Western Wheat Aphis {BracJiycohis tritici Gill.). This 

 insect was practically unknown this year. Heretofore it has caused 

 serious losses in wheat, but in 1916 it was scarce, owing perhaps to 

 the heavy winter-killing of wheat, and this year the winter-killing 

 was greater and the insect so scarce that enough could not be found 

 to continue the research studies. 



Woolly Apple Aphis {Scliizoneura lani^eva Hausm.). The 

 Avoolly aphis caused considerable damage in the Bitter Root \'alley 

 this season. It was exceedingly plentiful, more so than last season. 



The Elm Gall Louse {Schizoneura cnnericana Riley). Elm trees 

 in \arious localities of the State sufifered from the attacks of this 

 insect. Some of the trees were very seriously affected, maturing- 

 little or no new growth. 



Oyster Shell Scale { Lepidosaphes uhvi Linn.). This insect is 

 becoming very abundant and troublesome in the small uncared-for 

 orchards in western Montana. The thorough and consistent use of 

 lime-sulphur sprays will hold it in check. 



■ MOTHS AND BUTTERFLIES (LEPIDOPTERA) 



Imported Cabbage Butterfly {Pontia rapae Linn.). The cab- 

 bage worm caused a great deal of loss in all localities of the State. 

 The small gardens in the cities suffered the worst from this pest, as 

 they were not as well taken care of as the large gardens. Zinc 

 arsenite was substituted for Paris green in control work. 



Cutworms (Xochiidae). Besides some species of cutworms 

 attackino- wheat, earden cutworms were abvmdant e\'ervwhere in the 

 State. Reports of injury to all kinds of garden plants and requests 

 for control information were frequent. Peas, beets, and cabbage 

 seemed to suft'er the most injury though other plants were frequently 

 attacked. 



Erixoa tristicula Morr. This cutworm caused considerable losses 

 in wheat in the northern part of the State. As it works almost 



