. 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. 24 GRAMINEAE (GRASS FAMILY) with fine appressed hair; the two lateral spikelets have pedicels and are staminate or empty. So rapid a grower is the grass that two, three, even four, heavy crops of hay may be harvested yearly, if cut before it blooms; the hay is much relished by all kinds of stock and is very fattening; even the rootstocks are tender and sweet, and hogs eat them eagerly; were it not so
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. 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. 24 GRAMINEAE (GRASS FAMILY) with fine appressed hair; the two lateral spikelets have pedicels and are staminate or empty. So rapid a grower is the grass that two, three, even four, heavy crops of hay may be harvested yearly, if cut before it blooms; the hay is much relished by all kinds of stock and is very fattening; even the rootstocks are tender and sweet, and hogs eat them eagerly; were it not so ag- gressive it would be a most valued plant (Fig. 4.) Means of control With a view toward finding some means of eradication, J. S. Cates, of the Bureau of Plant Industry at Washington, was employed by the Government to make a special study of the plant, and the results of his experiments and conclusions are embodied in Farmers' Bulletin 279 of the U. S. Department of Agriculture. He states that the rootstocks are of three kinds, which he classifies as primary, secondary, and tertiary. "Primary rootstocks embrace all the rootstocks alive in the ground at the begin- ning of the growing season in the spring. "Secondary rootstocks are those which arise from the primaries, come to the sur- face and there form crowns, thus producing new plants. "A tertiary rootstock is one starting later in the season, about flowering time, from the base of the crown of this new plant. "These tertiary rootstocks, when the ground is soft, and especially when a large top is allowed to develop, grow to a large diameter and penetrate to a great depth, sometimes as much as four feet and normally from fifteen to thirty inches; at other times, when the soil is compact, and especially when the plant above ground is not allowed to develop by reason of mowing or grazing, or both, the tertiary rootstocks grow to but small diameter and run along just under the surface, cropping out at inter