. Fig. 7.—The appearance of rust: A, lower surface of leaves ; B, upper surface. Rust pustules are usually most conspicuous on the undersides of the leaves. (From Cir. 326.) crop is much reduced both in quality and quantity. The same treatment is recommended as for leaf spot. Stem Nematode.—This nematode, or eelworm, Ditylenchus dipsaci (see p. 68), lives in the stems of the alfalfa aboveground, with the effect that some of the stalks and branches are short, swollen, and deformed (fig. 8). The yield is reduced and the life of the stand shortened. This parasite is a strain of the bulb nematode,
. Fig. 7.—The appearance of rust: A, lower surface of leaves ; B, upper surface. Rust pustules are usually most conspicuous on the undersides of the leaves. (From Cir. 326.) crop is much reduced both in quality and quantity. The same treatment is recommended as for leaf spot. Stem Nematode.—This nematode, or eelworm, Ditylenchus dipsaci (see p. 68), lives in the stems of the alfalfa aboveground, with the effect that some of the stalks and branches are short, swollen, and deformed (fig. 8). The yield is reduced and the life of the stand shortened. This parasite is a strain of the bulb nematode, which attacks narcissus and other flowering bulbs. Other strains of the same species attack garlic, strawberries, cereals, certain weeds, and other plants. The strain from one host does not usually pass to another : the alfalfa stem nematode, for instance, does not attack bulbs or strawberries, although the worms in the different hosts seem to be of the same species.
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Keywords: ., bookcentury1900, bookcollectionamerica, booksubjectplantdiseases
