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Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year 1910
Volume XL, Part II (1910)

Wallace, Erret
Lime sulphur as a summer spray,   pp. 140-149 PDF (2.9 MB)


Page 147


WINTeR MEETING.
would cost, diluted 1 to 30, and of course the trouble of making
would cost, diluted 1 to 30, and of course the trouble of mak-
ing it is nothing, you simply dilute it. Now, if any of you
choose to go to the trouble of making a home-boiled con-
centrated solution you want to adopt some very uni-
form method for preparing the spray.  I would advise any
one to write to Pennsylvania State College for Bulletin 92,
by Prof. Stewart on the preparation of lime-sulphur. He pre-
scribes a method of preparing a home-boiled concentrated solu-
tion that will cheapen it as far as material is concerned, whether
it would cheapen it as far as work is concerned, if you
concluded to pay for the work, I cannot figure that out.
Mr. M. S. Kellogg: I would like to ask if the union of the
arsenate of lead and these other arsenicals is as complete with
the lime sulphur as with the Bordeaux mixture, is it as sym-
pathetic ?
Mr. Wallace: They seem to be a little more sympathetic be-
cause there is a chemical reaction takes place very rapidly when
you mix the two together and I said in my paper, you are not
putting arsenate of lead on your trees, but a new compound form
of the sulphates, probably some that are unknown, but all we
can say about it is that in this case and in all the cases which I
have heard reported thus far, that we have no bad results from
this chemical reaction, and the control of the codling moth has
been good.
Mr. Kellogg: Do you get the same arsenical result, the same
poisonous result?
Mr. Wallace: Well, we did this year, certainly.
Mr. Moore: I would like to ask, if you have a change in your
chemical compound, in your arsenate, whether or not there is
any danger from that becoming more soluble than the arsenate
of lead and resulting finally in the arsenical poisoning of the tree.
Mr. Wallace: That is a danger that has been predicted by
chemists, and from the theoretical standpoint there would be
danger from that point. All we can say is, thus far we have
not heard of any such a thing happening in actual practice.
Mr. Moore: Have you used them long enough to be certain ?
Mr. Wallace: No, I say, in our own case we have only used
it for the past season, but Prof. Cordley has used it for the past
two or three seasons, but as I said, there is a great deal that we
do not know about this and there is almost nothing that we are
sure of as yet.
147


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