MONTANA EXPERIMENT STATION Bui. 133 



causes a clogging of machinery besides their being the cause of 

 introduction of filth into the materials. Fumigation, intense heat, 

 or intense cold, are the remedies employed. 



Sugar Beet Webworm {Loxostege sticticalis L.). Primarily a 

 pest of sugar beets, this insect is also the cause of much injury to 

 gardens and alfalfa in nearly all parts of the state. A slight decrease 

 in its occurrence was noted this season. The destruction of thistle, 

 which farmers in the northern part of the state wished to harvest 

 for stock feed on account of drought conditions, has been a bad 

 factor with this pest. 



Codling Moth (Cydia pomonella Linn.). This well-known pest 

 of the apple, formerly present only in the vicinity of Missoula, is 

 becoming more widespread in the Bitter Root Valley. Elsewhere 

 it is by all odds the worst insect enemy which apple growers have 

 to fight and its establishment here will make necessary on the part 

 of the orchardists more effort toward insect control. 



FLIES (DIPTERA). 



Wheat Stem Maggot {Hyleimjia cerealis Gillette). This mag- 

 got, which bores through the central stems of wheat, was present 

 again this season. The field in Yellowstone county, where the pest 

 was first discovered in this state, was again a complete loss. Drought 

 and cutworms in the northern part of Montana caused maggot injury 

 to be largely overlooked. 



Onion Maggot {Phorhia ceparinn Meade). A slight decrease 

 in the presence of this insect was noticeable this year although in 

 some localities considerable loss from it was incurred. 



Cabbage Maggot {Phorhia 'brassicae Boche). No injury from 

 this pest was reported this season. 



Currant Fruit Fly (Epochra canadensis Leow.). A normal 

 amount of damage to currants and gooseberries from this insect, 

 which in some places has caused the growing of these crops to be 

 abandoned, was reported to the State Entomologist. 



House Fly (Musca domestica) . House flies were exceptionally 

 abundant during the past season and were the source of much annoy- 

 ance, not to speak of their activity in the spreading of disease. 



THE BEETLES (COLEOPTERA). 

 The Common Meal Worm {Tenebrio moUtor Linn.). The 

 •'Cadelle" {Tenehrioides mauritanicus Linn.). These well known 



