. Bacteria in relation to plant diseases. Bacteria; Plant diseases. BACTERIA IN RELATION TO PLANT DISEASES. The gum which thus oozes out in such quantities, if allowed to do so, at last becomes dry, owing to the evaporation of its wTater. In this state it appears as bright yellow stains on the end of the cutting. Sometimes the gum oozes out in a state so nearly dry that it hardens as it issues from the fibers into a yellow, coiled-up, hair-like body, and inasmuch as each fiber gives rise to one such body, all the fibers together originate a yellow, mossy appearance on the end of the cutting. I
. Bacteria in relation to plant diseases. Bacteria; Plant diseases. BACTERIA IN RELATION TO PLANT DISEASES. The gum which thus oozes out in such quantities, if allowed to do so, at last becomes dry, owing to the evaporation of its wTater. In this state it appears as bright yellow stains on the end of the cutting. Sometimes the gum oozes out in a state so nearly dry that it hardens as it issues from the fibers into a yellow, coiled-up, hair-like body, and inasmuch as each fiber gives rise to one such body, all the fibers together originate a yellow, mossy appearance on the end of the cutting. If another stalk, which is apparently sound, be taken from a stool in which one or more stalks have been already blighted by gumming, as above described, such stock will be found to exhibit the same symptoms, except that the cavities and rottenness at the base of the arrow are wanting. More- over, if other stalks be removed from shoots of cane standing nearby in the same field, but which, as yet, show no outward symptoms of this disease, the chances are that some of them will also be found to be more or less gummed. In some cases the amount of gum is so small as to ooze out in but a trifling quantity, to be detected only with a magnifying glass. Finally, the quantity of gum may be so small as not to ooze out at all; in such cases a good microscope is necessary to demonstrate that the gum is present. "Gumming" is considered by Dr. Cobb to be a good descriptive term for this disease, although he states that the substance is not a true gum. I continue to quote from Dr. Cobb's paper: After the cane is cut and ready for the mill, gummed stalks can be recognized not only by the yellow dried-up gum that exists on the cut ends, but also by their color. Gummed stalks generally have an over-ripe appearance. Green and yellow canes, when badly gummed become yellowish or orange, or even somewhat purple in color. The ribbon canes show similar alterations in their yellow stripes whil
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