taken U]) a lari^e share of my time during- the summer of 1916. For 

 details of this work see page 12. 



Administration work in eonnection with the luitdmologist's 

 office requires a large share of liis time and attention. 



The life history of the oak tree girdler has been comi)leted and 

 some interesting facts obtained. Work on tlat-headed and round- 

 headed borers is progressing, ddie forms closely related to the 

 ordinar\- oak borer are being studied most carefull}-. .Mr. Ruggles' 

 most im])()rtant work in spraying was done in co-operation with 

 orchardists and potato growers. Citizens are beginning to realize 

 the importance of this i)hase of fruit growing and are \ery anxious 

 t(j obtain the best methods of ])rocedure. The insect collection has 

 been added to, but on account of lack of fun.ds has not Ijeen worked 

 upon as it should l)e for the best results. 



We ha\e obtained some interesting data concerning honev bees 

 and insecticides, but this wxjrk has onl\- just begun. The life his- 

 tory of the strawlierr}- wee\il in Minnesota has l)een com])leted by 

 Mr. Marcovitch and we ha\'e found a very satisfactory method of 

 control. One of the most im])ortant insects of ras])berries, the 

 raspl)errv fruit wcjrm, has been studied and se\eral interesting 

 new ])oints in its life history have been discovered. The work on 

 the wheat stem maggot (Mr. A\'illiamson in charge) is still in prog- 

 ress. Stud\- of the white grul) is practicalh' comi)letetl and an 

 extension letter has l)een put)lished on this sul)ject. About 150 

 breeding experiments haAC been carried on in the Insectary by the 

 different men of the department. 



Flies. idle studv of the house f\\ has been continued through- 

 out the tut) \ears. This study a])plied especially to the house tly 

 under rural conditions. \'ery many observations have been col- 

 lected on the life historv. habits, connection with disease transmis- 

 sion, etc., micler farm conditions. A special sttidy was made U])on 

 the method by which the house tly passes o\"er the winter. This is 

 one of the few points in the bionomics of the luntse tly, which has 

 not been elucidated, 'idiis phase of the work is still going on, but 

 will probablv be com])lete(l the coming season, at which time results 

 will be ])td)!ished. A large exhibit \va^ i)rei)ared. partly from State 

 Entomologist's funds and i)artl}- from rni\-ersity funds, showing 

 how to control the carr\ nig of disease organisms in such places. 

 This mcnlel of a "S;initary I'arm," as it was called (constructed 

 under the direction of Mr. lloward), lias been in considerable 

 demand, being exhibited twice at the State Fair and at three county 

 fairs. It will be used again during the next two or three years for 



