. The blight canker of apple trees ... Apples. 12 Wisconsin State Horticultural Society THE CAUSE OF THE CANKER. A microscopic examination of the viscid milky drops that ex- ude from freshly cankered surfaces on moist, cloudy days will show them to be composed almost entirely of minute rod-shaped bacteria. The diseased tissue within the bark will also be found to be alive with these minute plants. By their rapid growth and multiplication within the cells of the bark they cause its. Fig. 10—Recently blighted shoot on limb of Greening apple tree with well marked active canker about its base. dea
. The blight canker of apple trees ... Apples. 12 Wisconsin State Horticultural Society THE CAUSE OF THE CANKER. A microscopic examination of the viscid milky drops that ex- ude from freshly cankered surfaces on moist, cloudy days will show them to be composed almost entirely of minute rod-shaped bacteria. The diseased tissue within the bark will also be found to be alive with these minute plants. By their rapid growth and multiplication within the cells of the bark they cause its. Fig. 10—Recently blighted shoot on limb of Greening apple tree with well marked active canker about its base. death. They are not carried along in the sap but slowly work their way from cell to cell. When the canker dries down they die and disappear so that examination of the tissue of old cankers does not show them. That they are the direct cause of the disease was proven in the following manner: Bacteria from the cankered tissue was introduced into the bark on the body of a healthy apple tree and also into the bark of a healthy. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original [Whetzel, Herbert Hice], 1877- [from old catalog]. Madison, Wis.
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectapples, bookyear1907
