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)
Keitt, G. W.
Report on the effectiveness of dusting, pp. 97-98 PDF (479.9 KB)
WISCONSIN STATE HORTICULTURAL SOCIETY cessful and more expensive than spraying, and could not be relied upon in the case of severe infestations. REPORT ON THE EFFECTIVENESS OF DUSTING By PROF. G. W. KEITr. I have been requested to report to you on those discussions at the recent scientific meetings in Chicago which related to the effectiveness of dusting for the control of plant diseases. There was less work reported on this phase of the subject than on insect control by dusting, the chief paper being that of Dr. N. J. Giddings, of. the West Virginia Agricultural Experiment Sta- tion on "Orchard Dusting versus Spraying." The recent revival of interest in dusting has led to compar- ative spraying and dusting experiments at a number of state experiment stations. An effort has been made to correlate this work, and Doctor Giddings has acted as leader of the project. Ac- cordingly, reports on the work in various states have been for- warded to him and were treated in his paper. The dusting work that Doctor Giddings reports related to the apple, and was almost exclusively concerned with apple scab. He stated that in West Virginia the results thus far obtained have indicated that sulphur dust is not so effective as either lime- sulphur or Bordeaux spray for the control of apple scab in those orchards of that state where the disease is severe. The evidence from Michigan and Virginia in 1920, he said, was much more favorable to dust. In Virginia, however, seven applications were made. Pennsylvania reported good results from dust in two orchards in 1920 and just a fair control in a third. In these cases five applications were made. In Connecticut in 1920 dust controlled scab well on Greening, which was but slightly attacked, but showed almost no bene- ficial effect on Fall Pippin, on which scab was more severe. Four treatments were made in each case. It was also pointed out that in Pennsylvania in 1919, when scab was severe, dust failed to control the disease, whereas it gave more satisfactory results in 1920, when scab was less severe. 7. 97
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