an apple canker due to cytospora pdf epub fb2
by frank lincoln stevens
Author: frank lincoln stevens
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...canker, toward one end, were of much darker bronzed or purplish color, altho at the other end of the canker this color was absent. The demarcation between the diseased and the healthy tissues was very sharp with a slight breaking away of the diseased from the healthy tissues. On removing the bark, a black transverse line about 1 mm. Wide was disclosed, apparently separating the healthy from the diseased tissues. It is quite probable that the canker at this point was in dormant condition, resting, not progressive. The other end of the canker did not show sharp limitations between the diseased and the healthy tissues, which gradually faded, one into the other, and did not show externally the 2-cm. , dark, purplish band mentioned above, adjacent to this end of the canker. 367 368 BULLETIN No. 217 [May, The canker was studded thruout its area with black pustules having the appearance of pycnidia or perithecia. These were slightly raised conically above the surrounding surface, were black,...
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