FfFTEENTH ANNUAL REPOKT OF STATE ENTOMOLOGIST ]!^>7 



leaves early in the summer, and in many cases the exuded hcmey dew 

 is a considerable nuisance. 



Fall-Grain Aphis (MacTosipJiinn sp.). There were inquiries 

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

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

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

 ently does no damage. 



The Western Wheat Aphis {Uraehycolns triticl 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 

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

 to continue the research studies. 



Woolly Apple Aphis {ScMzoneura lani^era Hausm.). The 

 woolly aphis caused considerable damage in the Bitter Root A'alley 

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



The Elm Gall Louse {Schizoneiira ainericana Riley). Elm trees 

 in various localities of the State suffered from the attacks of this 

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

 little or no new growth. 



Oyster Shell Scale (Lepidosaphes idini 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 (Ponfia i-apae Linn.). The cab- 

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

 The small gardens in the cities suff'ered 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 {Xocfriidne). Besides some species of cutworms 

 attacking wheat, garden cutworms were abundant everywhere in the 

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

 for control information were frequent. Peas, beets', and cabl)age 

 i^eemed to suffer the most injury though other plants were frequently 

 attacked. 



Ei(.roa tristicula Morr. This cutworm caused considerable losses 

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



