24 MONTANA EXPERIMENT STATION BULLETIN 474 



moth larvae noted in the past two years were in home orchards 

 where control measures were not carried out. Codling moths have 

 been satisfactorily controlled by one or two spray applications of 

 two pounds of DDT mixed with 100 gallons of water. 



APPLE APHID (Aphis pomi) 

 High populations of apple aphids occurred in western Montana 

 in 1949, followed by relatively low populations in 1950. Satisfactory 

 control was obtained with dinitro dormant sprays. 



WOOLEY APPLE APHID (See Ornamentals) 

 OYSTER SHELL SCALE (Lepidosaphes ulmi) 

 This sucking scale insect, which attacks many ornamental 

 plantings, shade trees, and fruit trees, is nearly always present in 

 unsprayed orchards. Oyster shell scale is readily controlled with 

 dinitro dormant sprays. 



PEAR LEAF BLISTER MITES (Eriophyes pyri) 

 This is another orchard pest which is common to Montana, and 

 which is usually present in unsprayed orchards. The pear leaf 

 blister mite is readily controlled with dinitro dormant sprays. 



EYE-SPOTTED BUD MOTH (Spiloyiota ocellmia) 

 The larvae of eye-spotted bud moths which feed on the buds 

 and blossoms of apples, cherries, and plums have been present 

 in economic numbers during the past two years. No severe out- 

 breaks have been reported. Dinitro dormant sprays have controlled 

 this insect. 



PLUM TREE BORER ( Synanthedon pictipes) 

 A tree infested with plum tree borers was observed in Yellow- 

 stone County in 1950. This is the only observation or report of 

 this wood-boring insect in the state during the past two years. 



PLUM APHID (Aphis padi) 



The plum aphid is generally found in most of western Montana 

 in economic but not severe populations. Plum aphids are readly 

 controlled with dinitro dormant sprays. 



SMALL FRUITS 



STRAWBERRY ROOT WEEVIL (Brachyrhinus ovatus) 

 The strawberry root weevil occurs over most of Montana, but 

 no serious infestations were reported in 1949-50. Early spring 

 applications of arsenicals or sodium fluosilicate baits readily con- 

 trol this insect. 



MILLIPEDES (Diplopoda Class) 



Several cases of millipedes feeding upon the fruit of ripened 

 strawberries have been reported in the past two years. This feed- 

 ing is suspected to be a secondary type of feeding, with birds or 

 slugs making the initial wound on the berry. 



