. Diseases of fruits and nuts. Fruit; Nuts. Fig. 54.—Pear-scab effect. fungus attack, was long a mystery, but it is now known to be the result of frost injury to the very young fruit in the blossom. Oak-Root-Fungus Disease, Armillaria Root Rot.—The French pear root {Pyrus communis) is one of the most resistant to oak root fungus, Armillaria mellea, which is very destructive to most fruit and other kinds of trees and shrubs by attacking the roots. Although not abso- lutely immune, the pear on this root may be planted with comparative security in infested soil. P. serotina and P. ussuriensis are
. Diseases of fruits and nuts. Fruit; Nuts. Fig. 54.—Pear-scab effect. fungus attack, was long a mystery, but it is now known to be the result of frost injury to the very young fruit in the blossom. Oak-Root-Fungus Disease, Armillaria Root Rot.—The French pear root {Pyrus communis) is one of the most resistant to oak root fungus, Armillaria mellea, which is very destructive to most fruit and other kinds of trees and shrubs by attacking the roots. Although not abso- lutely immune, the pear on this root may be planted with comparative security in infested soil. P. serotina and P. ussuriensis are more sus- ceptible to Armillaria than P. communis; the quince root is more suscep- tible than any of the pears. Pear trees on French root which contract. 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 Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : The College of Agriculture, University of California
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