Ginseng and Other Medicinal Plants / A Book of Valuable Information for Growers as Well as Collectors of Medicinal Roots, Barks, Leaves, Etc.

by A. R. Harding

1. The removal of a wild plant from its natural habitat to an entirely artificial one.

2. The encouragement by the application of manures and cultivation of a rapidity of growth to which the plant was by inheritance an entire stranger, thus weakening its constitution and depriving it of its natural ability to withstand disease. Cultivated roots in three years from the seed attain greater size than they often would in twenty years in the woods.

3. The failure in many cases to provide conditions in any degree approximating the natural habitat, as, for example, the failure to supply proper drainage that is in nature provided by the forest trees whose roots constantly remove the excess of rainfall.

Diseased Ginseng Plants.

4. The crowding of a large number of plants into a small area. This, in itself, is more responsible for disease epidemics than perhaps any other factor.

Of all the twelve or fifteen, now more or less known, diseases of this plant one in particular stands out as the disease of Ginseng. Altho one of the latest to make its appearance, it has in three or four years spread to nearly every garden in this state and its ravages have been most severe. This disease is the well known Alternaria Blight.

The Most Common and Destructive Disease of Ginseng.

The disease manifests itself in such a variety of ways, depending upon the parts of the plant attacked, that it is difficult to give a description by which it may always be identified. It is usually the spotting of the foliage that first attracts the grower's attention. If examined early in the morning the diseased spots are of a darker green color and watery as if scalded. They dry rapidly, becoming papery and of a light brown color, definite in outline and very brittle. With the return of moist conditions at night the disease spreads from the margin of the spot into the healthy tissue. The disease progresses rapidly so that in a very few days the entire leaf succumbs, wilts and hangs limp from the stalk. If the weather is wet, the progress of the disease is often astonishing, an entire garden going down in a day or two. Under such conditions the leaves may show few or no spots becoming thruout of a dark watery green and drooping as if dashed with scalding water. All parts of the top may be affected. The disease never reaches the roots, affecting them only indirectly.