University of Wisconsin Digital Collections
Link to University of Wisconsin Digital Collections
Link to University of Wisconsin Digital Collections
The State of Wisconsin Collection

Page View

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

Melville, J. G., et al.
The Northwestern Greening apple,   pp. 125-137 PDF (2.8 MB)


Tuck, Mr.
Spraying. Arsenate of lead.,   pp. 137-140 PDF (888.2 KB)


Page 137


WINTER MEETING.
into the cellar and kept them until some time between the 1st and
10th of June, and they came out in good shape.
The President: I will call attention to the fact that the North-
western Greening sells on its appearance rather than reputa-
tion. I think we rank red apples too highly; the Northwestern
Greening will sell on sight better than any red, so will the
White McMahan.
SPRAYING
ARSENATE OF LEAD.
The President: We will now be glad to hear from Mr. Tuck,
who will give us a ten minute talk concerning arsenate of lead.
Mr. Tuck: I might add a word about the Greening apples.
I have been at every exposition of apples pretty nearly at horti-
cultural meetings from the New England show to the National
show at Spokane, and I have not seen any better Greenings than
right out here on those tables, all the way around. Some of the
red apples at Spokane were a little bit larger and better looking,
but even so, I do not believe they tasted much better.
What I did want to talk to you about this morning is arsenate
of lead; I talked to you last summer on lime and sulphur. I am
going on the supposition that you use arsenate of lead. Any
farmer who is not spraying with arsenate of lead for codling
moth or curculio is running desperate chances of soon losing his
orchard. There are two kinds of arsenate of lead and only two,
two definite chemical formulae. I have here a solution of sodium
arsenate and here a solution of lead acetate. I will precipitate
these to what is known as a concentrated solution. In so
doing I am able to press the water out of my solution easily and
give you a high percentage of arsenic oxide, but I want to show
you that is not the proper way to make arsenate of lead. (The
speaker here illustrated methods of mixing.) On examination
you will see that is exceedingly coarse in structure, in that way
it loses its spreading power, it will not spread over the leaves.
When a man goes around and guarantees you high percentage
oxide arsenate of lead, he is either giving you an acid arsenate
of lead, or he is giving you a solution more concentrated which
lessens its covering qualities. There are only two kinds of
i
[p
137


Go up to Top of Page