Transactions of the Illinois State Horticultural Society Volume 14

Transactions of the Illinois State Horticultural Society Volume 14

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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. 1881 edition. Excerpt: ...of the disease cannot be observed from external signs; but on the growth of the current season and sometimes older parts, this is not the case. The color becomes darker, a watery appearance is presented, and, especially in the early morning, little beads of white or yellowish gummy matter may be seen. If wet with rain or dew, this exudation spreads over the surface or runs down the bark, dropping from projecting points. It seeems to me that some explanation can now be offered for the second apparently fallacious impression quite common among our people, viz.: the supposed influence of thunder-storms in accelerating the progress of the disease. The green leaves of the shoot or tree, with diseased bark, become, from the checking of the transpiration, gorged with water, and the fermentation, already in progress in them, quickly destroys their vitality. However this may be, I have not been able to detect any certain variation of the advance of the disease in the tree corresponding with changes of the meterological conditions. Doubtless there are some such variations, but not such as are appreciable on account of passing storms. Even winter weather does not offer complete immunity to the trees. During two winters I have watched the slow progress of the disease in the branches of the same tree, and am positive there was no mistake ai to" the nature of the phenomena. In the first case, the gradual destruction Prof. W. S. Barnard, First Report Cornell University, Experiment Station, p. 28. was continued during the spring; in the second, further progress was immediately prevented by the expansion of the buds. In many parts of the country patches of bark upon the trunks of apple and pear trees, usually near the ground, are found diseased more

Product details

  • Paperback | 158 pages
  • 189 x 246 x 9mm | 295g
  • United States
  • English
  • black & white illustrations
  • 123686980X
  • 9781236869807