AMERICAN POMOI.OGICAL SOCIETY 
IS 6 
the oyster-shell scale or bark louse, and to combat that we use the lime- 
sulphur solution. This last year in the Snake River valley they have used 
some quantities of a so-called, new lime-sulphur mixture; the results have 
been varied, so that I can not give any authentic information on that. But 
for the apple scab we use the lime-sulphur solution. Of course our condi- 
tions there are quite different from here, and the question of expense ranks 
very strongly with our growers; we have to ship the lime-sulphur prepara- 
tions from the Coast, at a cost of not less than about ten dollars and fifty 
eents to fifteen dollars a barrel. When we read these statements of the 
advantages of the powdered preparation, it appeals to us very strongly; and 
£ would like to see the question thoroughly discussed here. 
Mr. Pratt: The question is in regard to whether the liquid lime-sulphur 
is more advantageous than the powdered lime-sulphur, and as to the value 
af the lime-sulphur spray, the scalecide or the oil spray. If you will pardon 
me, I think that involves too many different points. Let us have one at a 
time. Have you had any practical experience with the use of powdered 
lime-sulphur? 
President: Very well; which do you consider the most efficient — lime- 
sulphur solution; the oil solution, or scalecide, in the killing of San Jose 
scale? 
Mr. Pratt : I would say that the oil preparations have a greater covering 
power or greater penetrative power in spraying especially old trees. The 
action of lime-sulphur is to stay just where you put it, like a whitewash; 
the oil has a separating property and will go around into cracks and crevices 
which the lime-sulphur will not reach. Then again, the amount of oil 
material that is necessary to spray an orchard is very much less, in fact 
shout one-half what it is of the lime-sulphur. 
I may illustrate that better by stating that a few years ago I got hold 
of a ninety-three acre orchard in bearing and I agreed to pay for the spray- 
ing that was done that spring. It required twenty-five thousand gallons of 
lime-sulphur spray to spray the orchard; it was done with two new power 
sprayers, and done well. In spite of that fact, I shook down over one hun- 
ted barrels of apples, too scaly to pack, and sent them to the dump. The 
next season I said to my men: “You want to make a thorough spraying with 
scalecide and we w'ill see which is the better proposition.” It required less 
than eleven thousand gallons to spray the trees that time, and we did not 
have a peck of scaly apples in the orchard that season. 
