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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
(1933)

Chambers, E. L.
Current insect problems and new insecticides,   pp. 11-13 PDF (866.2 KB)


Page 11


WISCONSIN CRANBERRY GROWERS' ASSOCIATION 11
are so susceptible to damping-off fungi that to date we have never
succeeded in saving more than 15 or 20% of the seed planted. An ar-
tificial soil' tried late the past spring gives promise of overcoming this
handicap. It is composed of equal parts of sand and ground cork, and
unlike peat may be sterilized with steam under pressure without be-
coming toxic to plants. Nutrient solutions must, of course, be used
with the mixture.
The plants grow slowly. After 8 or 10 weeks, when they are from an
inch to an inch and a half in height and have 8 or 10 true leaves, they
are transferred from the flats to pots. The first shoot grows erect, finally
reaching a height of four or five inches, is very slender and has small
leaves. Some time during the summer one or more runners branch
out from near the base and in some cases reach a length of 18 inches
or more before growth is arrested in the fall. The leaves on the run-
ners more nearly approximate normal size.
The plants require a resting period after the summer's growth. One
lot of seedlings planted in January and kept in Washington for ex-
perimental purposes stopped growing early in October. Near the end of
November all but 5 of the pots were set outside the greenhouse. After
6 weeks, during which time there had been only a few days of freez-
ing weather, one plant was returned to the greenhouse. It remained
dormant for about three weeks, finally put out a half inch of weak
growth and then became dormant again. This process was repeated
two or three times, but at the end of May it appeared to have resumed
normal growth. Meanwhile a second pot was brought in after eight
weeks' exposure. It started vigorous growth immediately and was
still growing rapidly the last of May. The plants which were kept
in the greenhouse all winter did not turn the normal red winter color.
They were just beginning to grow when last seen late in May.
Seedlings would probably bear fruit the third summer if given op-
timum conditions for growth. So far none of our crosses have
bloomed, as it has been necessary to move the older plants several
times. At present we have more than 1500 seedlings started.
CURRENT INSECT PROBLEMS AND NEW
INSECTICIDES
E. L. CHAmBnaS
What I have to say this afternoon would probably not come under
the category of a speech but just as a few remarks covering some of
the highlights of the insect pest situation for the season. In discus-
sing this subject over the radio the other day, I was advised by one of
the growers here this afternoon that I failed to mention any of the
cranberry pests. I was pleasantly surprised to find that someone
outside of members of my own family did actually listen in to these
noon-day farm programs over radio station WHA. I knew you
cranberry growers were having your troubles growing your crop all
right but did not want to add to your problem by suggesting that there
might be a lot of wormy cranberries. I was afraid that if I started
giving statistics from losses of fruit worm and fire worm that the
consumers might lose their appetite for cranberry sauce.
The insect obtaining the most publicity over the state and doubt-
' McArdle, R. E. Relation of mycorrhizae to coniferous seedlings. Jour-
nal Agricultural Research 44 :287-317. 1932.


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