Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year 1910
Volume XL, Part II (1910)
Hatch, A. L.
Notes on the lime-sulphur mixture, pp. 149-150 PDF (436.4 KB)
WINTER MEETING. Mr. Wallace: Yes, it kills by contact, it is not a poison. The President: This other question as to comfort in handling, is it fully as disagreeable to handle as the ordinary Bordeaux mixture I Mr. Wallace: I did not mind it at all. It is a little un- comfortable if you get some of it in your eyes, makes them smart, but you can see more clearly after they get over smarting. NOTES ON THE LIME-SULPHUR MIXTURE. By A. L. HATCH, Sturgeon Bay, Wis. Perhaps the most salient feature of lime-sulphur as a summer spray will be the probability of its serving as a plant stimulus. If with its use foliage is made more vigorous instead of being depressed or absolutely injured as is so often the case in the use of Bordeaux mixture, its use will mark a great step in ad- vance.. If also it will of itself have an insecticide effect upon aphis, thrips and young scale lice it will have a marked advantage over Bordeaux mixture. Both of these are well within the known effects of sulphur and worthy of careful experiments. In order to be acceptable to fruit growers the spray must be capeble of carrying an insecticide so the operation will not need to be duplicated to prevent fungus and insect injury. While chemistry shows the effective part of lime-sulphur spray to be a delicate combination it is not probably much more so than that of Bordeaux mixture. There is probably some form of arsenate that will coalesce in such a way as to be fully efficient, even if arsenate of lead can not be used. The new form of arsenate brought out by French scientists recently possesses some apparently great advantages over any other form now known and if it will combine with lime-sulphur without discord promises to be the acme of spraying mixtures. For this arsenate it is contended that by substituting iron sul- phate for lead acetate in the making of arsenate it is expected to remedy the toxic effect of cumulative sprayings. If by the use of lime-sulphur we eliminate copper from our fungicide and by the use of iron sulphate eliminate the lead from the insecticide a further step is taken toward what is desired. 149
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