56 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



each county visited and sent to Wooster and to the Field Laboratory 

 of the Bureau of Entomology at Lafayette, Indiana, to be examined for 

 parasitism. No particular section of the state was found to be favored 

 in the distribution of these parasites. 



By August first, we were sure that the state was again threatened by 

 serious fall damage, and another campaign of late sowing seemed 

 necessary. This time it was not necessary to solicit the interest of the 

 county agents nor of man}'^ of the farmers. The question most frequently 

 asked was: "When shall we sow'" Uniform sowing dates had been 

 decided upon b\- the entomologists working on this problem in Illinois. 

 Indiana and Ohio, and these were given wide publicity in Ohio as the 

 probable safe dates to sow to avoid both Hessian fly and winter-killing. 



To supplement the sowing dates and better guide the growers of 

 northern Ohio past the expected damage from the fall brood, the three 

 entomological departments of Ohio arranged to establish three field 

 observation points where the daily emergence and egg-laying could be 

 watched during September. It was hoped in this way to be able to 

 hold back sowing until the danger of the brood was past, if the dates 

 previously chosen were again too early. To explain this plan, and also 

 organize the counties in the worst infested area, the Extension Entomolo- 

 gist, during August, met with the crops committees of the farm bureaus 

 in 19 of the north-western counties, as it was thought best to let these 

 committees take the lead in the campaign work in their counties. A 

 "fly meeting" was held in conference with these men, who at these 

 meetings chose the earliest date they wanted any wheat sown in the 

 cotmty and outlined their plan to prevent wheat being sowed early this 

 year. The county agents of these counties were instructed to keep in 

 touch with the records from the rearing cages and egg-laying counts 

 that were to be made by the entomologists, and have the organizations 

 in readiness to further postpone the sowing dates if necessary. The 

 committees in these counties conducted their own campaign. This 

 was done through circular letters, meetings, daily press items, posters, 

 and rubber stamps used on the mail of county firms doing business with 

 farmers. Eight county agents had attractive exhibits of adult Hessian 

 flies at County Fairs while the University featured this at the State Fair. 



Method for Discovering the Seeding Date 



In the Journal of Economic Entomology, February 1916, pp. 

 142-144 a description was given of a new method used to determine 

 the seeding date, and it will be remembered that Miami County, Ohio, 

 was almost wholly freed from Hessian fly by one season's work. Sub- 

 stantially the same method was followed this season, but we endeavored 



