TWENTY-SECOND REPORT OF STATE ENTOMOLOGIST 11 



arriving at the office with complaints of damage and requests 

 for control. On the accompanying map (fig. 1) are indicated 

 the places where this insect has done some damage. 



The major damage was done to alfalfa. However, sugar 

 beets in the Ronan district and cabbage plants in one field in 

 Gallatin County also suffered. Although the damage was very 

 slight this year, this insect undoubtedly built up its population 

 and under favorable conditions it may appear in outbreak num- 

 bers next season. 



Dr. Cook and the writer are now working on the history 

 and records of Canadian outbreaks in the hope that some clue 

 may be had as to what to expect the coming season. This in- 

 sect will be carefully watched for, and if necessary control 

 operations will be organized. 



3I0SQriT0ES 



During 1926 many requests for mosquito control work were 

 received. Most of these requests came from the Milk River 

 Valley. Although very little was known regarding the habits 

 of mosquitoes in this state, it was decided to attempt some 

 control measures during the season of 1927. A study of our 

 records showed that thirty-eight different species of mosquitoes 

 occurred in Montana. In records from Milk River Valley, al- 

 though many species of mosquitoes occurred, it was apparent 

 that only four were responsible for the majority of the com- 

 plaints, namely Aedes spenceri Theo., Aedes nigromaculis Ludl., 

 Aedes vexans Meig., and Aedes doi'salis Meig. A man was sent 

 to the Milk River Valley who was paid partly by the Malta 

 Chamber of Commerce and the Chinook Lions' Club, and partly 

 by the Experiment Station. Much interesting information was 

 secured concerning the life history and habits of mosquitoes. 

 In 1928 work was confined to the Malta district, as with tlie 

 funds available much more information could be had by con- 

 centrating study in one locality. Excellent cooperation was 

 secured through Mr. T. L. Larson, secretary of the Malta Com- 

 mercial Club. Fine control was secured until about the middle 

 of May when, due to exceedingly dry weather, irrigation was 

 started on a large scale. Normally irrigation is not started 

 until July. In 1928, however, the irrigation produced a July 

 crop of mosquitoes during the last part of May. The man in 



