This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
I have a small cold grapery, in which the vines have passed their fourth season, and have borne two fair crops. One point in my experience may be worth communicating to the readers of the Horticulturist It relates to the manner of using sulphur for the prevention of mildew. I have used it, in solution with quicklime, in the following manner: Take, say a half bushel of lime and 6 lbs. of flower of sulphur. Mix them together in a large tub (a half hogshead), and pour on enough water to slake the lime, and mix it to about the consistence of whitewash. After this is thoroughly mixed, fill your tub with water, and stir it, so as to diffuse the lime and sulphur through the water. Let it stand long enough to allow the lime to settle, and you will have a clear, transparent liquor strongly impregnated with sulphur, as will be manifest from its yellow color, and its strong, sulphurous taste and smell. My practice has been to have the ground in the interior of the grapery sprinkled with this liquor every evening through the season, as long as there is any danger of mildew. The tub may be filled up with water, from time to time, as the liquor is used, and the quantity of lime and sulphur mentioned, will be enough for a grapery 30 to 50 feet long, the entire season.
In a few instances, I have used it diluted with about two parts of water to one of the liquor for syringing the vines - but I have seldom thought it necessary to use it otherwise than by sprinkling the ground as mentioned. My vines have never been attacked with mildew in the least degree - and I have never used sulphur otherwise than as above stated. There may be nothing new in the manner of using sulphur which I have adopted, but I have never seen its use recommended precisely in that way - and as I have found it entirely successful, and in no respect detrimental, I conclude that it has not been as generally practised as it deserves to be.