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