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Wisconsin State Cranberry Growers Association / Wisconsin State Cranberry Growers' Association. Forty-fifth annual meeting, Wisconsin Rapids, Wis., December 2, 1931. Forty-fifth summer convention, Wisconsin Rapids, Wis., August 18, 1931

Bain, Henry F.
Spraying and water raking experiments,   pp. 14-17 PDF (986.6 KB)

Page 14

til the injuries are sufficiently reduced to make the pests no more
difficult to control than our native forms.
In 1870, when the Mormons were settling in the vicinity of Utah,
a plague of grasshoppers appeared and almost completely devastated
the country, coming in such swarms that they appeared as clouds, and
just when it looked as though every green leaf and grass blade was to
be destroyed, a flock of birds appeared in swarms, almost obscuring
the sun, and in a single day completely wiped out the outbreak. Here
in Wisconsin, we find locks of birds following an outbreak of such
pests which play an important part in checking serious outbreaks be-
fore they attain much headway.
As an example of what a heavy rain will do toward checking an
outbreak of a serious pest, we might cite an instance that took place
several years ago in Marinette County. We were preparing to spread
poison bran for the control of grasshoppers, and just as we were
ready to issue the word to the farmer that they were about all hatched
out of the egg beds and were ready to migrate, a storm.was threaten-
ing and so it was thought advisable to wait until after the storm, and
two days later, after a heavy storm had subsided, there were not
enough of these hoppers left to warrant the spreading of the bran.
In another county adjoining they decided to apply their bait, and the
farmers there still believe that the enormous reduction in numbers of
these insects was due to the treatment, whereas, had they waited, they
would very likely have found it unnecessary to apply the poison at alL
By Herzw   F. BmlN, Senior Patoogiot
Many of you will be interested in the results of our experiments
with spraying and water raking cranberries. We were first ap-
proached on this question three years ago by a company 'which had
been experiencing considerable difficulty with berries spoiling on the
markets. The company proposed to try spraying with a fungicide to
overcome the trouble, a remedy of proven value in other cranberry
sections, and offered to cooperate with our office in making a study of
the value of spraying under Wisconsin conditions. Since the practice
of spraying had not to our knowledge been used in connection with
water raking, and since the use of this method of harvesting is in-
creasing yearly in the state, we felt that the question was of suffi-
cient importance to justify an extended study.
Bordeaux mixture of the 4-4-50 formula has been used in all spray-
ing experiments, and two and three applications per season have been
tried. The first application has invariably been made in the "hook
stage", the second immediately after bleesom, and a third some two
weeks later in certain tests. The results have been measured by de-
termining the amount of rot which developed in berries from the re-
spective plots after holding for about 38 months.

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