14 MONTANA EXPERIMENT STATION BULLETIN 526 



OYSTERSHELL SCALE (Lepidosaphes ulmi) 



The south central part of the state including Yellowstone, Still- 

 water, and Carbon counties showed the heaviest infestation by this 

 pest during the biennium. 



TUSSOCK MOTH (Hemerocampa leucostigma) 



Larvae of these moths defoliated apple trees in Gallatin and Park 

 counties in 1956. 



A FRUIT TREE LEAF ROLLER (Lepidoptera: Tortricidae) 



This insect caused considerable damage in Liberty County in 

 1955 on apple and crabapple trees. 



CHERRY SLUG (Caliroa cerasi) 



Infestations on apple trees in Gallatin County and in Carbon 

 County were reported during 1956. Occasional sporadic infestations 

 occur west of die divide. 



PLUM POCKET LEAF GALL (Eriophijes sp.J 



Wild and native plums in Fergus and Stillwater counties showed 

 leaf galls caused by this mite during 1956. 



GREAT RASIN TENT CATERPILLAR (Malacosoma fragilis) 



This insect was reported defoliating cherry trees in Rroadwater 

 County in 1955. No infestations occurred in 1956. 



CHOKECHERRY MIDGE (Diptera: Cecidomyiidae) 



Chokecherries showed signs of attack by this insect over extensive 

 areas in the eastern and southern parts of the state. Typical symptoms 

 are hollow, bladder-like fruit, 3 to 4 times normal size, in which the 

 orange or pink larvae are found in numbers ranging from 2 to 10. 

 Since this fruit is wild no economic control methods have ever been 

 worked out. 



STRAWBERRY LEAF ROLLER (Ancylis comptana fragariae) 



In the western part of the state where strawberries are grown 

 commercially, gardeners usually take precautions to prevent outbreaks 

 of this pest. In the south central area where preventative control 

 is not practiced, occasional infestations occur— usually in home gardens. 



