20 MONTANA EXPERIMENT STATION BULLETIN 484 



ELM SAWFLY (Cimbex americana) 



The elm sawfly, a defoliating pest of elm trees, was reported 

 only once during the biennium. This occurrence was in Wibaux 

 County in 1952. 



VIRGINIA CREEPER LEAF HOPPER (Erythroneura ziczac) 



The hosts of this sucking insect pest are Virginia creeper, 

 raspberry, apple, and some other plants. The principal occurrence 

 of this leaf hopper has been on Virginia creeper vines and other 

 ornamental plants grown nearby. It is wide-spread throughout 

 Montana and has caused considerable concern to many gardeners. 

 The Virginia creeper leaf hopper has been successfully controlled 

 with DDT sprays and dust. 



ROSE CURCULIO (Rhynchites bicolor) 

 The rose curculio seems to be rather widespread throughout 

 Montana. Reports of occurrence and injuries from this pest came 

 from McCone County in 1951, and from Sanders, Roosevelt, and 

 Lewis and Clark counties in 1952. 



LILAC BEETLE (Brachyrinus meridionalis) 

 Lilac beetle infestations and damage continued to occur at 

 Hamilton in Ravalli County during the biennium. 



CONIFERS 



BLUE SPRUCE GALL APHID (Adelges cooleyi) 



Unsightly pine-cone-like galling of spruce trees has been ob- 

 served over most of the state during the biennium. Inquiries were 

 received only from Yellowstone County in 1951, and from Galla- 

 tin, Lake, Glacier, and Deer Lodge counties in 1952. Timely spray- 

 ing with benzene hexachloride has controlled this pest success- 

 fully. 



SPRUCE LEAF-TIER (Epinotia nanana) 

 Two cases of spruce leaf-tier infestations were reported in 

 Gallatin and Madison counties in 1951. Only one report from 

 Roosevelt County was received in 1952. This insect pest of spruce 

 trees undoubtedly exists more generally throughout the state, but 

 its damage is either unnoticed or is not reported. 



PINE LEAF SCALE (Chionaspis pinifolioe) 

 Infestations of pine leaf scale were reported in Yellowstone 

 and Missoula counties in 1951 and in Yellowstone, Beaverhead, 

 Carbon, Ravalli, Silver Bow, and Gallatin counties in 1952. From 

 the standpoint of observations it would appear that this pest is 

 far more prevalent than indicated by these reports. 



