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Wisconsin State Cranberry Growers Association / Wisconsin State Cranberry Growers' Association. Forty-seventh annual meeting, Wisconsin Rapids, Wisconsin, December 14, 1933. Forty-seventh summer convention, Wisconsin Rapids, Wisconsin, August 8, 1933

Goldsworthy, Vernon C.
1933 insect situation in Wisconsin and control methods,   pp. 33-39 PDF (1.7 MB)

Page 33

on the fifteenth of December it fell to 29 below zero at which time we
understand some of the bogs had not yet been covered. In some of
these instances we understand there was not sufficient water to cover
with while in others we are told that the water was being withheld
because of fear of injury to the vines if the water was placed on too
early from lack of oxygen before the fruit could be removed in the
spring. Most of our cranberry growers are keeping rather accurate
records of their activities and bog cultural methods. We believe that
every cranberry grower should keep records of this kind. When you
get a bumper crop you will want to know how you handled the bog to
secure these results. In talking to some of the older cranberry grow-
ers we are told that in the early days of the cranberry industry in
Wisconsin, there was nothing heard of winter injury or injury to the
vines from a lack of oxygen in the water. In being questioned on
their method of procedure they explained that it was very simple in
those days. We are told that just as soon as the crop was harvested
the bog was fruited and forgotten about until April or May of the
following year. Maybe some accurate experiments carried on would
be of benefit to your industry in determining just when the water
should be applied and when it should be taken off. Our office is not in
position to experiment because we have no bogs in which to experi-
ment and consequently we will have to depend on the records we can
secure from you growers. For your own satisfaction and good we
would suggest that you begin experimenting and determine for your-
self the best conditions for growing your crop on your own bogs and
that you follow these methods regardless of how they may be doing
it elsewhere. Experiment on other methods of procedure, however, as
you go along.
The last three years with their dryness have done much to increase
the insect population on Wisconsin marshes. Insects never before re-
ported on Wisconsin marshes have made their appearance and to date
have done thousands of dollars worth of damage. The cranberry gird-
ler for example which had never been known to damage cranberry
vines in Wisconsin until last year, 1932, did extensive injury in both
the Mather and Cranmoor districts and is present on practically any
and all marshes in the state, although on some marshes it is not as
extensive as on others, but may build up much as does the black head
fire worm. This year the girdler did not work as much as last year,
and consequently the damage is not as extensive as it was the previous
year. Injured areas should be resanded this year if possible. Sand-
ing is helpful as it gives injured vines a chance to re-root above the
injury, destroys the ideal environment which the girdler larvae pre-
fers, covers up the pupae so that the moths have difficulty or are not
able to emerge at all the following spring, and lastly discourages
moths from laying on newly sanded marsh where the eggs may be
readily destroyed and the young do not have a suitable home. Flood-
ing, of course, should be practiced in the early fall whenever the
larvae are noticed, if possible.
Fruit worm (Mineola vaccinii) was particularly bad this year and
destroyed many hundred dollars worth of fruit. Fruit worm is our
most difficult insect to control and up to date no satisfactory method

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