Horticulture, a text book for high schools and normals, including plant propagation; . nners or rootstock thatare difficult to cut with tillage implements; among them may bementioned quack grass, Johnson grass (Fig. 246), Canada thistleand Bermuda grass. Weeds of the wild onion type which have 347 348 CONTROL OF WEEDS bulbs that will grow in any position are also difficult to get rid ofby a limited amount of tillage. Thorough and frequent cultivationhowever, will destroy weeds of this type. Weed Dissemination.—All three classes of weeds bear seeds andare spread by this method for long distance
Horticulture, a text book for high schools and normals, including plant propagation; . nners or rootstock thatare difficult to cut with tillage implements; among them may bementioned quack grass, Johnson grass (Fig. 246), Canada thistleand Bermuda grass. Weeds of the wild onion type which have 347 348 CONTROL OF WEEDS bulbs that will grow in any position are also difficult to get rid ofby a limited amount of tillage. Thorough and frequent cultivationhowever, will destroy weeds of this type. Weed Dissemination.—All three classes of weeds bear seeds andare spread by this method for long distances. Weeds that formtheir seeds in burs, such as burdock, cockle bur, sand bur, bidens,Spanish needles and others are often carried on the coats of animalsfor long distances. They literally catch rides to their new homes. Tickle grass, tumble weed,and a few others of that typespread by the whole body car-rying seeds, rolling m the windfor miles and miles. Occasionallythese are carried high in the air,but usually are found rollmg onthe ground. Many seeds, such as Fie. 244. Tig.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgardeni, bookyear1922
