Potato Wilt, Leaf-Roll, and Related Diseases

Potato Wilt, Leaf-Roll, and Related Diseases

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ... LEAF-ROLL. That leaf-roll is not communicable from diseased to healthy plants is.the conclusion to be drawn from all available evidence. Appel, Werth, and Schlumberger (1910) report grafting a great number of diseased sprouts on healthy ones and vice versa. These were put in the greenhouse and union took place. The scions gradually died, however, after the plants were brought into the open air. During Potato Leaf-roll. Typical Rolling Of The Upper Leaves Of A German Variety. After Appel.) Fig. 1.--Leaf-roll In Seedling Potato No. 16518, Alexander No. 1 Red X Keeper. Washington, D. C., August, 1912. Fig. 2.--Potato Leaf-roll, Showing Its Effect On Tuber Formation. Stolons Thickened And Producing Numerous Small Tubers Only. Mitchell, Nebr.. September, 1911. 1 Photographed By Fritz Knorrj the four weeks during which they were under observation there was no apparent influence of the diseased part on the healthy. Similar experiments were performed by Schander (1912) with substantially the same results. The evidence in the seedling collection of this bureau is also strongly negative. Certain varieties with clearly marked leaf-roll have stood surrounded by healthy varieties without any indication of the spread of the disease. RELATION OF FUNGI TO LEAF-ROLL. The first investigations of leaf-roll made by Appel in 1905 led him to believe that it was due to a Fusarium similar to that described by Smith and Swingle. Mycelium was found in the vascular bundles of diseased plants, and cultures were derived from the stem ends of tubers. The species of Fusarium was not determined with certainty, for at that time the identification of Fusaria by morphological characters was not possible. The findings of Appel were verified by many other workers, and for a time...show more

Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123648729X
  • 9781236487292