MONTANA INSECT PESTS, 1949 AND 1950 25 



WHITE GRUBS (See General Feeders) 



CURRANT FRUIT FLY (Epochra canadensis) 



The currant fruit fly which is widely distributed throughout 



the state appeared only in light infestations during the last bien- 



nium. Two to three applications of rotenone sprays satisfactorily 



controlled this insect. 



RASPBERRY ROOT BORER (Bembecia marginata) 



During the last two years the raspberry root borer has been 

 prevalent throughout western Montana and has been found in 

 Yellowstone, Prairie, and Dawson counties in eastern Montana. 

 Good management of the raspberry planting such as proper cul- 

 tivtivation, fertilization, pruning, etc., appears to be the best means 

 of preventing serious damage. 



RASPBERRY SAWFLY (Monophadnoides geniculatus) 



The raspberry sawfly has been of economic importance in 

 western Montana in both 1949 and 1950. It is readily controlled 

 by the proper application of rotenone dusts and sprays. 



INSECTS DESTRUCTIVE OF ORNAMENTALS 



DECIDUOUS 



BOXELDER BUG (Leptocoris trivittatus) 

 This brilliantly red marked sucking insect is present nearly 

 every place in the state where boxelder trees are grown. Many 

 reports and inquiries on this insect have been received during the 

 past two years, most of them being concerned with boxelder bugs 

 in homes, which they commonly invade. 



ASH BORER (Podosesia syringae fraxini) 

 The ash borer was found or reported only in Valley and 

 Wibaux counties during the last biennium. 



GREEN ASH APHID (Prociphilus venafuscus) 

 The green ash aphid which is found throughout most of west- 

 ern Montana infested nearly all green ash in that area in 1949. In 

 1950 very few of these sucking plant lice were reported or ob- 

 served. The green ash aphid is readily controlled by a dormant 

 application of dinitro or dormant oil sprays. 



ASH FLOWER GALL (Eriophyes fraxiniflora) 

 The ash flower gall, which is caused by mites attacking the 

 flowers of male ash trees, was reported in Yellowstone and Still- 

 v/ater counties in 1949. No reports were received in 1950. 



WILLOW LEAF GALL (Poiitania sp.) 

 One specimen of willow leaf gall was received from Shelby in 

 September of 1950. This leaf gall is caused by a Hymenopterous 

 sawfly. 



