ELEVENTH ANNUAL REPORT OF STATE ENTOMOLOGIST 125 



caused by the San Jose scale. This aphis is of growing importance 

 because of recent discoveries by plant pathologists w'ho have dem- 

 onstrated that it is a carrier of pear and apple blight. 



Cabbage Aphis {Aphis brassicae L.). Unusually abundant dur- 

 ing the past summer. So many inquiries were received that an illus- 

 trated circular concerning its life history and control has been pre- 

 pared and is now being distributed. 



The Sugar Beet Root Louse (Pemphigus hetae Doane). Root 

 lice caused more injury in the sugar-beet district than for several 

 years. It was estimated that in some fields the tonnage was reduced 

 a third. The very complex life history of this important pest has 

 been worked out as an Adams project and will soon be published. 



The Green Bug {Toxoptera gi-aminuvi Round.). Found to be 

 quite abundant in several grain fields but apparently doing little 

 damage. 



Oyster Shell Scale (Lepidosaphes iihni L.). This is the most 

 injurious scale insect that occurs in Montana and each year it causes 

 considerable loss of fruit. It is being studied under the Adams Fund. 

 This season particular attention was given to ascertaining whether 

 two dilute sprays for apple scab would also control the scale. Our 

 observations indicate that the scale is much reduced by such treat- 

 ment, but that the strong dormant spray is needed to completely 

 control it. 



LEPIDOPTERA 



Bee Moth {GaUeria mellonella L.). Reported from Flathead 

 and Dawson counties. 



Sugar Beet Webworm {Loxostege sticticalis L.). A bad out- 

 break of this pest again occurred in the Billings sugar-beet district. 

 Approximately eight tons of Paris green were used in a spraying 

 campaign against the Worms and in nearly every instance the beets 

 were saved. The attack occurred in June and, as in 1912, the usual 

 August brood of worms did not appear. In several parts of the 

 State alfalfa was injured by this pest. 



Cutworms (J\foctiddae) . Climbing cutworms did considerable 

 damage to young fruit trees in the Bitter Root Valley. In one big 

 orchard where the cutworms had been abundant the previous year 



