THIRTY-THIRD BIENNIAL SESSION 1 55 
but while the slides are going we will not stop to discuss the treatment, but 
will reserve that until the end and then sum it all up. 
Discussion. 
Mr. Burton: One question; what is the comparative value of the oil 
spray, manufactured by the 0. Y. Pratt Co., compared with the value of the 
lime-sulphur and the scalecide? 
Virginian: In the Shenandoah valley and in West Virginia they have 
almost discarded the oil sprays of all kinds, and are using the line-sulphur 
almost altogether. The oil spray has no value whatever as a fungicide and 
that is the main thing; it is more expensive than lime-sulphur?. It costs 
more than the scalecide, and so far as we can see there is no difference in 
the results. But we do know that the lime-sulphur gives us about as good 
results as anything we ever tested. 
Mr. Roberts: It depends entirely on the quality of the lime-sulphur 
that is purchased; for with San Jose scale 0 (r other scale insects it 
does not seem to be effective. Last year we had peach orchards treated with 
the scalecide, and lime-sulphur. The scalecide gave better results than the 
lime-sulphur. Although the cost per barrel for the scalecide is higher than 
the other, it will cover more surface, and thereforei I would not like to say 
which is the cheaper; but after all there is use for both and we want them 
both. 
Mr. Powell: I have used the oILspray in a small way on all kinds of 
fruit trees and found it very successful in controlling the scale. Fortu- 
nately we have not been seriously bothered with scale in our own orchards, 
so have not had to spray for it, but I have seen the oil spray used for scale 
on apples, pears, peaches and plums, and I have seen a small plum orchard 
that was very thickly encrusted with scale cleaned up inside of two years. 
It has been said that it is not safe to use it on plums and peaches, but I 
have not seen any injury whatever to either peach buds or 1 plum fruit. I 
think so far as the cost is concerned, taking into consideration the matter 
of labor, it is just as cheap to use it as it is the lime-sulphur — and much 
cheaper if you have to make your own lime-sulphur. 
Mr. Moore: As to lime-sulphur; I used it for the first two sprays; 
one of them to be made when the blossoms are just unfolding. It is a fact 
that I prefer the Bordeaux mixture for the fungous troubles. 
Mr. Lindley: My experience with Bordeaux is to spray once in the 
year when the peaches are just maturing. I am inclined to think it is a big 
advantage. Spray every year with lime-sulphur; every year, scale or no 
scale. It may tend to knock the blossoms off, but the great trouble is, ac» 
cording to my idea, that you have got to have it or you will lose your fruit. 
I think the old Bordeaux mixture is the best thing that I have ever used to 
keep down the rot. 
About six pounds of lime to four pounds of bluestone is what we use; 
about two and one-half pounds of arsenate of lead is added for the insect 
foes. And when we use that regularly we have no recurrence of rot. 
Question: What do you use out west for killing scale? 
Mr. Dean: In the state of Montana we have no scale; the San Jose 
scale is no longer troublesome — it is the only scale we ever had. We have 
