Fourteenth Annual Report of the State 

 Entomolocjist of Montana 



INSECT PESTS OF 1916 



THE MITES AND TICK8 (^CARINA) 



The Pear-Leaf Blister-Mite {I'hijtoiiirH j)y]'i Pagnat). The pear- 

 leaf hlister-niite was reported as doing- a great deal of damage t(> 

 apple trees in the Bitter Root Valley during the past season. 

 Further experimental work in the control of this insect has been 

 outlined for next season. 



THE BRISTLE TAILS AND SPRING TAIL (THYSANURA) 



The Fish Moth {Lepisrna saccliarina Linn.). As usual there 

 were several inquiries regarding the fish moth, which seemed plenti- 

 ful in warm closets and cellars. 



The Snow Flea. Se^'eral reports were received, accompanied 

 by cans containing millions of specimens of a black CoUembolan, 

 which is more or less plentiful on standing water. This year it 

 was unusually abundant, even on damp rotted boards, leaf mold 

 and old rags. No damage could be attributed to it. 



Collembola in the Soil. Reports were received regarding a 

 tiny, white CoUembolan, which was found to be plentiful in the 

 soil in greenhouses but not doing any apparent damage. In the 

 college greenhouses we have found what is apparently this same 

 insect injuring leaves of cucumber that were near the ground. 



COCKROACHES AND G-RASSHOPPERS (ORTHOPTERA) 



The German Cockroach {Blatta germanica Linn.). Inquiries 

 regarding the control of cockroaches were frequent. The most com- 

 mon one was the German cockroach, Blatta gernianica. The Oriental 

 cockroach, Periplaneta orientalis, was also reported but not as 

 being abundant. 



Grasshoppers {Acrididae). There was no serious outbreak of 

 grasshoppers this year, but late in the summer small outbreaks were 

 reported from widely separated communities. The species which 

 appeared to be doing the most damage was Mehnwplus atlanis. 

 Owing to its appearing late in the season, this insect did its greatest 



