Bulletin Volume 173-191

Bulletin Volume 173-191

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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. 1910 edition. Excerpt: ...galls resemble wound tissue, but later in the season they often assume a dark-brown or black color due to the death and decay of the outer tissues. OTHER MANIFESTATIONS OF THE DISEASE. The disease manifests itself in a number of ways in addition to the formation of galls. The affected vines are stunted in their growth. The leaves are usually smaller and are often etiolated or chlorotic. The galls usually die annually, and if under ground they commonly rot away, the decay killing the adjacent tissues of the root and often killing the vine above the point of attack. DEVELOPMENT OF THE FORMS OF CROWN-GALL. DEVELOPMENT OF HOOT GALLS. The subterranean form of the disease usually does not develop abundantly the first year on vines grown from cuttings. An exception must be made where cuttings are taken from diseased vines. In an experiment with cuttings selected from healthy and diseased vines of the same varieties a marked difference was noted in the relative development of the disease. The experiment was conducted as follows: Cuttings were taken from apparently healthy and from plainly diseased Thompson Seedless, Zabalkanski, Black Malvoisie, and Mission vines from the same vineyards at Bernalillo and Mesilla Park, N. Mex. They were planted in the greenhouse in sterilized soil in sterilized pots and watered with boiled water. The results of the experiment are shown in Table I. Table I.--Results of an experiment to determine the relative susceptibility to crowngall of Jour varieties of grapes grown in New Mexico, cuttings being made from apparently healthy vines anil from vines'plainly diseased. It will be seen from the table that the use of cuttings taken from plainly diseased plants increased the development of the crown-gall a Sterilized in...
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Product details

  • Paperback | 306 pages
  • 189 x 246 x 16mm | 549g
  • United States
  • English
  • black & white illustrations
  • 1236959639
  • 9781236959638