Fourteenth Annual Report of the State 

 Entomologist of Montana 



INSECT PESTS OF 1916 

 THE MITES AND TICKS (ACARINA) 



The Pear-Leaf Blister-Mite (Phytoptes pyri Pagnat). The pear- 

 leaf blister-mite was reported. as doing a great deal of damage to 

 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 AXD SPRING TAIL (THYSANURA) 



The Fish Moth {Lepisma saccharina, Linn.). As usual there 

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

 ful in warm closets and cellars. 



The Snow Flea. Several reports were received, accompanied 

 by cans containing millions of specimens of a black Collembolan, 

 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 Collembolan, 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 GRASSHOPPERS (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 germ auiea. The Oriental 

 cockroach, Periplaneta oric it talis, 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 Melanoplus atlanis. 

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



