86 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
his tests further the next year, I purposely wished him to go into that 
portion of the state where we could test this material under the most 
adverse conditions. In Green Bay, Wis., about half-way up the west¬ 
ern side of Lake Michigan, we usually have very wet, rainy seasons. 
1915 and 1916 were unsually wet; in fact, it rained almost every day 
for several weeks, and I think that had a great deal to do with the 
failure of the application of this bait. 
Dr. Headlee’s report on their success under New Jersey conditions 
appeals to me as warranting further tests of this poisoned bait spray 
under reasonably satisfactory conditions. 
I don’t know of any other control for this terrible pest, because any 
of you who have been in the onion-growing districts and have seen 
such conditions as have been portrayed here realize what this means to 
an onion grower. 
Mr. J. S. Houser: During the years 1915 and 1916 we attempted 
the use of this bait in the muck land of northern Ohio. There the 
weather conditions were apparently much the same as those condi¬ 
tions which prevailed in Green Bay, because in both seasons we had 
very rainy weather at the time of application and at the end of the 
growing season we felt that very little good had been accomplished by 
the application. During those two seasons the cost of the application 
far exceeded the value of the crops. However, we are not absolutely 
discouraged with the method and since it does afford some promise, we 
hope to repeat it in a much more thorough way and on a larger scale 
in the years to come. 
Mr. F. Z. Hartzell: In regard to fighting of onion maggot, it is 
sometimes unsuccessful because of the drying of the material before 
the flies eat sufficient of it, and I think the plan that has just been out¬ 
lined, of using pans on the onion bed, would overcome that difficulty. 
I think that would help at least in the dry seasons. I do not recall 
how Professor Headlee applied his material. I would like to ask that 
question. 
Mr. T. J. Headlee: We applied the material by the Sanders’ 
method, whisking it directly on the plant with a whisk-broom. 
Mr. J. G. Sanders: I would suggest that any of those who are 
contemplating testing out this material should remember to apply 
this poisoned bait spray to adjacent vegetation as well as to the onion 
held. I think that is really more important than making the applica¬ 
tion in the fields until the onions are of fair size. 
President R. A. Cooley: This investigation and discussion seems 
to me to be almost typical of rather a broad condition. We might be 
led to be discouraged and not continue these studies which now appear 
to be somewhat conflicting, and that in the face of the fact that this 
