. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . old (Botrytis vulgaris) Occasionally lemons while in storage will develop what isknown as gray mold. It appears as a dark brown discolora-tion and softening which is followed by the mycelium whichappears at the surface and produces gray or mouse-colored spores. The fungus is apparently dependent onabrasions for access to the fruit and would no doubt bemuch more abundant were it not for the fact that the blueand green molds usually monopolize such op
. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . old (Botrytis vulgaris) Occasionally lemons while in storage will develop what isknown as gray mold. It appears as a dark brown discolora-tion and softening which is followed by the mycelium whichappears at the surface and produces gray or mouse-colored spores. The fungus is apparently dependent onabrasions for access to the fruit and would no doubt bemuch more abundant were it not for the fact that the blueand green molds usually monopolize such opportunities fordevelopment. Black rot of Navel orange (Altcrnaria citri) Navel oranges only are subject to black rot which may be recognized by thepremature ripening,abnormally largesize, and very deepred color. Theaffected fruits arevery conspicuous onthe trees liefore themain crop has col-ored up. Thespores of the fungusgain entrance at thenavel end throughslight imperfectionsof the peel or per-haps through thestigma of the blos-som, and produce a black, decayed area under the decay does not immediately spread through the entire. Fig. 135. — Black rot of Navel. Diseases and their Control 389 fruit, but remains for weeks as a small black mass of tissue may occasionally extend to the surface, butmore often this is not the case and the fruit finds its wayinto the hands of the consumer. There is no known remedy for this trouble which occa-sionally affects as much as one per cent of the crop in certainlocalities. It is suggested, however, that all affected fruitsshould be gathered up and burned in order to reduce the num-ber of spores in the orchards. Brown spot of Navel orange The brown spot of the Navel orange may be described asoccurring irregularly over the surface of the orange. Fromone to fifty or more spots may develop on a single fruit. Thespots vary in size from a mere point to one inch in diameter,averaging about one-fourth inch. In outline the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcitrusfruits, bookyea
