A Study in Cereal Rusts; Physiological Races Volume 137-152

A Study in Cereal Rusts; Physiological Races Volume 137-152

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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. 1914 edition. Excerpt: ...11 days Arnautka 288............................................... 12 days Khapli...................................................... 14 days It will thus be seen that the incubation period is longer on the more resistant varieties. These figures are, of course, not absolute, but vary with the temperature, and, to some extent, with soil conditions. All however, vary in nearly, but not absolutely, the same proportion. The character of infection is distinctly different on the different varieties. It is quite noticeable that the same phenomena are observed as appear on various biologic forms. On Minnesota No. 163 the pustules are large, varying from 2 to 6 millimeters in length. They rupture the epiderm very readily and shed spores in great abundance. Very rarely are small, unruptured pustules developed. The host tissues nearly always remain fairly healthy, a yellowing which gradually appears furnishing the external evidence that the fungous hyphae are in the plant. On einkorn and Iumillo, which in the greenhouse are only fairly resistant, the pustules are usually somewhat smaller. There is a tendency in these two forms toward the development of small dead areas. These areas are either very distinctly yellowed or sometimes killed outright. The general appearance is, however, usually not sharply different from that of infected Minnesota No. 163, except in degree of infection as evidenced by smaller pustules on einkorn and Iumillo. On emmer there were often long infected, yellow areas in which there was a fairly large number of very small pustules, usually less than one millimeter in length, many of which never ruptured. Then again fairly large areas of host tissue were practically killed and only a few small green islands developed. On...show more

Product details

  • Paperback | 24 pages
  • 188.98 x 246.13 x 1.27mm | 63.5g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236937341
  • 9781236937346