Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year ending July 1, 1921
Vol. LI (1921)
Fracker, S. B.
Dusting to control fruit insects, pp. 95-97 PDF (772.7 KB)
. N WISCONSIN STATE HORTICULTURAL SOCIETY 95 DUSTING TO CONTROL FRUIT INSECTS By S. B. FRAcK. This paper and the next consist of a report of the symposium on dusting held at Chicago in December. So much interest has been expressed in this method of applying insecticides that it seems best to discuss the subject briefly at this time and outline -the results of experiments in other parts of the United States rather than wait until the Wisconsin experiment station tests have been completed. A special study of the control of sucking insects was the sub- ject of the first report by Prof. P. J. Parrott of the Geneva, New York, station. Dusts containing one-half, one and two per cent of nicotine, respectively, were used. Apple aphids were found unequally susceptible to the dust. From 91 to 98 per cent of the common apple leaf species were killed during a rainy period when the check trees lost 27 to 60 per cent from natural causes. The results were also satisfactory against the currant aphis, apple leaf hoppers, and nymphs of the four-lined leaf bug, but less so against the woolly aphis and po- tato aphis. Air currents, denseness of tree growth, cold and wet weather and the presence of honey dew or waxy secretions- of insects were found unfavorable for effective work. The high cost of nicotine preparations at present, according to Professor Parrott, makes the expense of dusting against sucking insects "almost prohibitive for large operations." The results outlined by Dr. T. J. Headlee of New Jersey in- cluded work on codling moth, curculio, apple scab, and plant lice. His first table, which is given herewith, indicates unsatis- factory results against curculio, but successful applications against scab. Cureullo Per Cent Scab Per Cent Year Location Check Dust Liquid Check Dsat Liquid Glasboro--_.- 29.1 4.4 5.5 22.2 0.0 0.0 19iL _ _____ _ hVneland._______ 70.3 43.8 31.6 51.9 14.8 6.4 IML........hVeland---- -- - 3.68 3.38 ___ 3.86 19.69 117_____= Haddonhl ____ no reCord 5-7.3 5.85 2.52 49.7 17.12 18.66 48.97 7.90 9.53 I __ _;
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