Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Historical mixture. In 1886 the spraying campaign may be said to have been well started in this country. The disinfection of seeds by bluestone was practiced first with the cereals as early as 1807 by Prevost of France, and improved by Dreisch in 1873, by the addition of a limewater bath to follow the bluestone. In 1887 Jensen of Denmark improved upon these methods by developing his hot-water treatment, which has since proved of great value, not so much for its primary use, in which it has been s
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Historical mixture. In 1886 the spraying campaign may be said to have been well started in this country. The disinfection of seeds by bluestone was practiced first with the cereals as early as 1807 by Prevost of France, and improved by Dreisch in 1873, by the addition of a limewater bath to follow the bluestone. In 1887 Jensen of Denmark improved upon these methods by developing his hot-water treatment, which has since proved of great value, not so much for its primary use, in which it has been superseded by formalin, but owing to its applicability to those loose smuts which cannot be successfully treated by surface disinfection. Similar seed treatments have been extended to the potato by Bolley, and to cabbage by Harding. The production, by breeding, of new and disease-resistant varieties is one of the latest and most promising methods of combating plant diseases. Grapes resistant to Phylloxera were produced by Millardet; cotton, cow- peas, and watermelons resistant to wilt by Orton; cabbage by Jones; tomato by Durst and others; tobacco resistant to Thielavia by Johnson. No small part in the progress that has been made in the prevention of plant disease is due to the improve- ment of appliances, dusters, pumps, nozzles, etc., for dis- tributing the disinfectants upon the plants. This progress is well illustrated by comparing the broom of Millardet with the knapsack, barrel, or power sprayer of to-day. Fig. 3. — An improved brush for distributing Bordeaux mixture. After Lodeman.
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