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Black knot of the plum
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Description: "In answer to a communication of mine, Professor C. H. Peck, botanist, of Albany new York, informs me that he has found sacks filled with spores with in the perithecia of black-knot, and has furnished me with a sketch of the sack as seen by him, (see U, Fig. 17.) I represents a highly magnified view of the true spore of this for of Shaeria." -Watts, 1874
Source: Fred'k Watts Report of the Commission of Agriculture for the year 1873 (Washington D.C.: Government Printing Office, 1874) 199
Keywords: plum, tree, growth, black, knot, sacks
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