MONTANA INSECT PESTS, 1953-1954 15 



STRAWBERRY LEAP ROLLER (Ancylts comptana fragariae) 



No economic infestations of this pest were reported or observed during 

 the biennium. 



INSECTS DESTRUCTIVE TO ORNAMENTALS 



DECIDUOUS ORNAMENTALS 



ASH PLANT BUG {Neohorus amoenus) 



This pest has definitely become more abundant during the last two 

 years. In 1953 damaging infestations were reported or observed in Gallatin 

 and Yellowstone counties. In 1954, however, the entire southwestern part 

 of the state had slight to moderate damage. Heavy damage to ash occurred 

 in Gallatin, Yellowstone, and Fergus counties. 



COTTONWOOD GALL MITE (EHophyes sp.) 



Infestations occurred in Musselshell, Yellowstone, and Chouteau coun- 

 ties in 1953. In 1954 infestations occurred in Yellowstone, Teton, Cascade, 

 and Chouteau counties. 



COTTONWOOD LEAE-STEM GALL (Pemphigus populi-tramversus) 



An infestation was reported in Sweet Grass County in 1953. Infesta- 

 tions were reported from Golden Valley, Cascade, Teton, Big Horn, Rosebud, 

 and Yellowstone counties in 1954. 



VAGABOND GALL (Mordwilkoja vagabunda) 



This aphid on cottonwoods has been reported from the triangle area 

 and the south-central area of Montana both years of the biennium. 



A TENT CATERPILLAR (Malacosoma sp.) 



Moderate to severe infestations occurred in Flathead, Lake, and Galla- 

 tin counties in 1953. There were no infestations observed or reported 

 during 1954. 



POPLAR BORER {Saperda cakarata) 



Poplar borers appeared to be more prevalent during the past two years 

 than they had been for some time. Severe infestations occurred in Big Horn 

 and Deer Lodge counties, and moderate damage was found in scattered areas 

 over the state. 



ELM LEAF CURL APHID (Enosoma amencanum) 



These aphids were quite abundant in 1954 although there were few 

 reports of their occurrence in 1953. Some towns in the state had to initiate 

 control programs to combat this pest. Organic phosphates, applied under 

 high pressure to penetrate the curled leaves, gave good control of this insect. 



