. The blight canker of apple trees ... Apples. 6 Wisconsin State Horticultural Society neglect may suffer seriously from its attacks and the dead limbs protruding here and there from the green foliage in old or- chards are often to be attributed to the ravages of this canker. In young trees with smooth bark the cankers are easily de- tected even in their first stages. They appear as discolored and. Fig. 4—Typical pit cankers in the body of a tree from which the diseased bark has dropped out. The upper one is exuding sap, — " ; Fig. 3—Cankers in body of tree resulting from th
. The blight canker of apple trees ... Apples. 6 Wisconsin State Horticultural Society neglect may suffer seriously from its attacks and the dead limbs protruding here and there from the green foliage in old or- chards are often to be attributed to the ravages of this canker. In young trees with smooth bark the cankers are easily de- tected even in their first stages. They appear as discolored and. Fig. 4—Typical pit cankers in the body of a tree from which the diseased bark has dropped out. The upper one is exuding sap, — " ; Fig. 3—Cankers in body of tree resulting from the renewal of activity sea- son after season. Observe that these started from small pit cankers which partially healed each season. The disease the following season destroyed all the bark growth, leaving only the little bit of wood formed in the callus. This still persists. somewhat shrunken areas, the margin along the advancing front being usually slightly raised or blistered. The tissue in ac- tively spreading cankers is of a darker green than the healthy bark and is very watery or sappy. On damp cloudy days drops of a milky, sticky fluid exude from the cankered tissues through. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectapples, bookyear1907
