. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. CRUCIFERAE {MUSTARD FAMILY) 185 branches, bright yellow, fragrant, each about a half-inch broad, the calyx-lobes spreading; they begin to open at the bottom of the cluster, which lengthens as the season advances and the pods form and ripen, so that there may be emptied pods below and forming buds above. Silique, or pod, one to two inches long, round and somewhat constricted between the seeds, ^veined
. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. CRUCIFERAE {MUSTARD FAMILY) 185 branches, bright yellow, fragrant, each about a half-inch broad, the calyx-lobes spreading; they begin to open at the bottom of the cluster, which lengthens as the season advances and the pods form and ripen, so that there may be emptied pods below and forming buds above. Silique, or pod, one to two inches long, round and somewhat constricted between the seeds, ^veined and ribbed, and tipped with a long, two-edged beak; it may contain three or four to a dozen or more seeds, one of which is usually sticking in the beak when the pod splits. Seeds globular, dark reddish brown, under a lens seen to be delicately pitted. They are a common impurity of grass and clover seeds. (Fig. 128.) Means of control In grain fields seedlings should be harrowed out, with one of the light harrows known as weeders, when the grain is but a few inches tall; or later, but before the grain begins to head, the Mustard may be almost entirely destroyed by the use of Iron sulfate or Copper sulfate spray. Stubbles should be surface-cultivated immediately after harvest in order to stir into growth such seeds as may be lying on the ground; the young plants to be plowed under, or they may be profitably grazed off by sheep. Plants of waste places, fence rows, and roadside should be hand-pulled or closely cut when the flowers are first noticed. INDIAN MUSTARD Brdssica jtincea, Cosson Introduced. Annual or biennial. Propagates by seeds. Time of bloom: May to July. Seed-time: June to August. Range: Ontario to Manitoba, southward to Georgia and Kansas. Habitat: Grain fields, roadsides, and waste Fig. 128. — Char- lock (Brassica arven- sis). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
