MONTANA INSECT PESTS, 1951-1952 17 



PEAR LEAF BLISTER MITE (Eriophijes pyri) 

 Infestations of pear leaf blister mite were reported in Lewis 

 and Clark County in 1951 and Gallatin, Lake, Ravalli, Missoula, 

 and Mineral counties in 1952. 



SMALL FRUITS 



MILLIPEDES (Diplopoda class) 

 Millipedes continued to be a frequent pest of strawberries 

 throughout the state during the past two years. Rotenone or DDT 

 dusts effectively control these pests. 



CURRANT FRUIT FLY (Epochra canadensis) 

 The currant fruit fly is widely distributed throughout the 

 state. It was, however, only reported in Cascade and Gallatin 

 counties in 1951 and Gallatin, Missoula, Roosevelt, and Garfield 

 counties in 1952. The current control recommendations are a 

 spray application using 3 pounds of 50 percent DDT wettable 

 powder to each 100 gallons of water when 80 percent of the blos- 

 soms have withered or fallen. This is followed by a second similar 

 spray application 10 days later. 



WESTERN RASPBERRY FRUITWORM (Byturus bakeri) 

 Infestations of western raspberry fruitworms were reported 

 in Silverbow County in 1951 and Missoula County in 1952. The 

 current control recommendations are to spray in the cluster bud 

 stage with 3 pounds of 50 percent DDT wettable powder to each 

 100 gallons of water. 



RASPBERRY CANE BORER (Oberea bimaculata) 

 Two infestations of raspberry cane borers were reported in 

 Lake and Yellowstone counties in 1951. No infestations were re- 

 ported or observed in 1952. 



STRAWBERRY LEAF ROLLER (Ancylis comptana fragariae) 

 Two infestations of strawberry leaf rollers were reported in 

 Lake and Stillwater counties in 1952. This pest of strawberries 

 was neither reported nor observed in 1951. 



INSECTS DESTRUCTIVE OF ORNAMENTALS 



DECIDUOUS 



BOXELDER BUG (Leptocoris trivittatus) 

 Reports and inquiries regarding boxelder bugs were infre- 

 quent during the biennium. However, this insect was observed 

 in many areas throughout the state where boxelder trees are 

 grown. 



ASH BORER (Podosesia syringae fraxini) 

 Moderate to severe infestations of ash borers were found in 

 Roosevelt, Richland, and McCone counties in 1951, and in Sheri- 

 dan and Richland counties in 1952. Two to three paint brush ap- 



