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Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year ending July 1, 1921
Vol. LI (1921)

Koch, H. F.
Outdoor rose growing,   pp. 157-168 PDF (3.0 MB)


Page 164


F~ ~ ~ ~~~~~~~~~~~,-- -- .- -l
164          FIFTY-FIRST ANNUAL REPORT OF
to the fact that the leaves cannot stand it, but because the leaves
are diseased, they will naturally drop off. I have tried it. I
took a good bush, a perfectly healthy bush, and sprayed it with
the usual mixture, and it did not seem to affect it at all. I had
a Dorothy Perkins Climber on which the mildew got a little the
start of me, and I sprayed it, and the next thing I knew, the
leaves began to drop. Of course it did not affect the flowers
any, because I got at it quickly enough.
I usually give them about one spraying of Bordeaux mixture.
The only thing is, do not buy prepared liquid Bordeaux mixture.
It is absolutely no good. My chemist tells me that a prepared
Bordeaux in liquid form loses certain properties of destroying
harmful germs and other things of like nature which infest the
rose bushes; but the powdered form for the average amateur is
all right. It is not as good as that which the horticulturist pre-
pares himself, but it is still good. This information was given
me by a chemist who is a thorough student of the subject, and
should know what he is talking about. I have found it to be a
fact myself, because after he told me that I discarded the pre-
pared liquid Bordeaux, and now buy a powdered form.
Of course, you have to combat insect enemies. There is no
getting away from that. They are almost everywhere. There
are two kinds, the sucking and the chewing or eating. The eating
kind is very rapidly disposed of, if you get up early. Take
arsenate of lead in the ordinary powdered form, and mix it with
your Bordeaux as you begin to spray, and that will do the work;
there is no question about it. And the chances are that you will
not be troubled until possibly toward the end of the summer
season, when the plants begin to make roses for the fall bloom-
ing.
The Aphis present a problem also. They are very persistent,
and you will have difficulty oftentimes if you do not get right
after them the minute you see the first one. They multiply so
fast that as fast as you kill them off, more seem to spring out of
the ground. I do not know where they come from, but they are
there. This year I was a little bit slow getting at them. I was
out of town for a day or two, and when I came back I found that
my plants were full of aphis. I have been after them ever since,
and I am just about getting rid of them. It is just possible that
they are more persistent or numerous this year than ordinarily.
I do not know. Of course, seasons change.
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