The Blade Blight of Oats; A Bacterial Disease

The Blade Blight of Oats; A Bacterial Disease

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ... of pear and apple. The former is known to be a disease prevalent during those seasons when much rain, cloudiness, and wet. muggy weather prevail. Every plant disease may be said to have its certain favorable meteorological conditions. Whetzel," writing on the bacterial canker of apple, states: "It is well known that the "blight" in the twigs of pear and apple trees is more active and severe during a continued period of warm, muggy weather. The same is to be said of the cankers on the limbs and bodies of the trees. It was repeatedly noticed during the past season that the active spread of the cankers was coincident with certain periods of rainy weather. The progress of the disease through the bark is always abruptly checked on the appearance of bright, sunny days. The recurrence of favorable weather may often cause a renewal of activity, the canker spreading and increasing its former extent." From observations of field conditions and control experiments in the pathologium, the writer is convinced that the chief factors in the spread and production of the blight disease of oats are rains, excess of humidity and cloudiness. Excess of these conditions reduces the vitality of the oat plant and leaves it undoubtedly much more susceptible to the disease. Primary infection is chiefly stomatic, resulting from the spattering of the organisms upon the blades by the rain. Following such means of infection it would be 18 A. D. Selby, Ohio Naturalist, Vol. VII, No. 4, pp. 79-85, 1907. 19 The Blight Canker of Apple Trees by H. H. Whetzel, February, 1906, Bulletin 236, Cornell University Experiment Station. logical to expect the most rapid spread of the disease during periods of rainy, cloudy weather. Control experiments, more

Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • United States
  • English
  • black & white illustrations
  • 1236814150
  • 9781236814159