Bulletin Volume 103-138

Bulletin Volume 103-138

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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: ...of the host may be stunted and slowed up for a short time until new conducting tissues are formed. This may occur, as in some cases under observation, within a few weeks; or it may never occur at all, if the tree is old. The gum is only a temporary barrier to the spread of the fungus, however. The fungus gradually grows through the gum destroying it, and then infects a new area. That this fungus has the ability to dissolve the gum Is indicated by Its behavior iii infected young trees which often live some years after the primary infection occurs. The history of such reinfections and final death of tree can often be traced in the trunk of the tree. In one tree seven years from setting, in which two of five large branches had wilted, the primary infection had occurred at some sort of wound on the trunk four years before. A large canker was formed the first year, but was almost entirely overgrown. Following this some of the new growth became infected but by the end of the third year the wound was overgrown. During this time, however, the fungus had spread throughout the interior of the trunk and branches, and after another year had reached the cambiuin of some branches when of course they died. The fungus had been found fruiting on gum masses exuded from inoculated wounds, showing that at least some constituents of the gum may be used in the growth of the fungus. This was more strikingly shown In pure cultures on exuded gtfm. October 29th gum which had exuded in large masses from plum trees during the previous six weeks was collected and Roaked in water over night to soften the surface as much as possible. It was then a stiff plastic mass. About ten to twelve c.c. of this gum was placed in each of six test tubes, and steamed twenty minutes...show more

Product details

  • Paperback | 244 pages
  • 189 x 246 x 13mm | 440g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236891236
  • 9781236891235