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.
If this Grape could be managed so that a sufficient quantity of berries could be set on every part of the bunches, and the gangrenous spots prevented on each berry, it would be the finest grape in the world, both for size of bunch, size of berry, and rich, vinous, musky flavor. When even in tolerable perfection, I know no grape to equal it. Unfortunately, it is what we call "a bad setter;" that is, the fertilizing powder is either deficient in quantity, or has no power to cause the seeds to mature. Hence the berries either drop off or are ridiculously small. To prevent, or rather, supply, this deficiency, it is advisable to apply pollen (the fertilizing dust), taken from some other variety. The pollen of the common Muscat will answer well, or even of the still more common Black Hambro'.
The second desideratum, namely, the preventing of the, blackish broad spots which often appear on the finest berries, has just been attained by the gardener above mentioned (Mr. Acomb). He says it is caused by aa acrid liquor, generated in spots under the outer skin of the berry. Whenever he observes the blister (for it has much that appearance) he opens the skin with a pin's point, and lets out the liquor, which cures it completely, leaving only a small scar. I saw several berries so punctured, and they appeared quite healed. He had prac-tised this for three years with perfect success. Let every grower of this fine Grape try this simple remedy for this destructive disease. I have no doubt he will be equally successful. - T. Appleby.