Diseases of Field and Garden Crops, Chiefly Such as Are Caused by Fungi

Diseases of Field and Garden Crops, Chiefly Such as Are Caused by Fungi

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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. 1884 edition. Excerpt: ...size, the less compact Oidium growth above collapses and falls away. The true ergot is then left devoid of its viscid, watery apex, with its little tortuous furrows and conidia or stylospores in the condition in which we first began our observations upon it. The value of the Oidium growth to the ergot is obvious, for if one needle-shaped spore from a Claviceps produces the infant state of ergot on one rye-flower, we see that in a few days this larval condition can produce thousands of new Oidium spores, each spore being equally powerful with a Claviceps spore in producing ergot. Ergots seldom germinate and produce the Claviceps when more than a year old; two-year old examples have, however, been known to sprout, but we have not heard of three-year old specimens germinating. In concluding this subject we will mention some of the effects of this pest, and say how its general prevalence may be reduced. Fig. 106.--Spore of Sptta. celia or Oidium of Ergot, germinating at A, and producing a spore or conidium at B. Enlarged 1000 diameters. The consumption of ergot when it is ground up with grain causes chronic dry, black, or livid gangrene, sometimes with but little fever, inflammation, or pain. The limbs affected become insensible and cold, and, in the progress of the disorder, dry, hard, black, and withered. In some instances violent pain has been recorded, with redness, insupportable heat, and delirium. A line of separation, reaching to the bone, is formed by the disease between the dead and living tissues. Ergot is especially potent, when taken fresh and raw, in exciting strong uterine contractions; and when a small portion only is consumed, it causes weaker contractions which wear out the injured animal with fatigue. A correspondent of the...show more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236803566
  • 9781236803566