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DISEASES OF GINSENG
By Dr. Walter Van Fleet
The diseases of cultivated ginseng appear to be chiefly incident to the crowding of the plants, deficient drainage, and lack of ventilation. In their natural state the plants as a rule are thinly scattered on the forest floor under advantageous conditions of ventilation and soil drainage, the normal action of tree roots playing no inconsiderable part in the latter condition, and diseases, of which there are several, are likely to remain quite local in effect; but under the crowded conditions of commercial culture they tend to spread and may cause material injury. Errors in fertilization and soil treatment are also fruitful sources of injury and by weakening the resistance of the plants further invite the inroads of disease. Bulletin No. 25 of the Bureau of Plant Industry treats of ginseng diseases and their control in the light of the most recent researches. Prospective growers will find it of advantage to consult this work.
Fur, News. Fur News, January 1916.
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