MONTANA INSECT PESTS, 1953-1954 13 



SUGAR BEET ROOT MAGGOT (Tetanops atdnchl) 



This insect has not been of too much importance, and only one infesta- 

 tion was reported from Carbon Coimt\'. 



PEAS AND BEANS 



PEA APHID (Macrosiphum pisl) 



This insect was present in moderate numbers over most of the pea- 

 growing area of the state during the biennium. However, no severe infes- 

 tations were reported. 



PEA WEEVIL (Bruchus pisorum) 



No economic infestations of pea weevil were observed or reported dur- 

 ing the biennium. 



INSECTS DESTRUCTIVE TO GARDEN AND TRUCK CROPS 



CRUCIFERAE 



CABBAGE MAGGOT (Hylemya brassicae) 



This garden pest continues to be common throughout most of the 

 state. If transplanting water containing chlordane is used in areas known 

 to be infested, the cabbage maggot seldom becomes a serious problem. 



IMPORTED CABBAGEWORM (Pieris rapae) 



No outstanding infestations were reported in 1953. In 1954 some 

 light to moderate infestations were observ'ed in the western part of the state. 



ROOT CROPS 



ONION MAGGOT (Hylemya antiqua) 



This p>est continues to occur in gardens generally throughout the state. 

 However, it is quite easily controlled by the use of chlordane at the time 

 of planting. 



INSECTS DESTRUCTIVE TO FRUIT CROPS 



ORCHARDS 



BLACK CHERRY FRUIT FLY (Rhagoletis fausta) 



During 1954 a rather extensive trapping program invoking the east 

 shore of Flathead Lake and the surrounding area indicated that this pest 

 was much more widespread and causes a higher incidence of infected fruit 

 than was previously known. Spray programs using tetraethyl pyrophosphate 

 and parathion gave excellent results in controlling this insect. However, 

 the presence of unattended orchards and individual trees around homes 

 which receive no control measures provides a constant source of reinfesta- 

 tion of the commercial orchards in the area. There is still no indication 

 that this pest may be harbored in the native wild cherry. 



