FOOD CONSERVATION AND ECONOMIC ENTOMOLOGY 121 



mis) came in during the fall, and as these are parasitic on grass- 

 hoppers, it is probable that the abundance of the insect will be 

 reduced to some extent. 



Good success was obtained in Iowa in 1917 by the use of a 

 poison bran mash. This has been widely used in Kansas and 

 elsewhere recently and proved very successful in Iowa. Should 

 grasshoppers become abundant in Iowa in 1918 it is planned 

 to hold demonstrations in the counties where trouble may occur, 

 working again with the county agricultural agents. 



Probably the most puzzling questions the economic entomolo- 



Witeworm Ouibreaks l^ll 



Figure 9. 



gist has to answer are those relating to wireworms. Figure 9 

 shows where these insects were reported in 1917. 



Through the federal extension entomologist advice is being 

 given on wireworms at small gatherings arranged for by the 

 county agricultural agent. With a better understanding on the 

 part of the farmer of the eoiiditions under which wireworm 

 damage is likely to occur there is no doubt that damage of this 

 character may be measurably reduced. 



Still another feature of the work is that in the nature of an 

 entomological survey for destructive insects on field crops. Last 

 year a survey of fall wheat was undertaken with the object of 

 determining whether damage by the Hessian fly might be ex- 

 pected in 1918. This work is being continued this spring and 

 is now in progress. In two counties some little damage by 



