. Un manuale di erbacce : con le descrizioni di tutti i più perniciosi e fastidioso piante negli Stati Uniti e in Canada, le loro abitudini di crescita e di distribuzione, con metodi di controllo . Le erbacce. COMPOSITAB {famiglia composito) 547 seme-tempo: da luglio a settembre. Intervallo: Wisconsin nelle pianure del Saskatchewan, verso sud in Missouri e del Nuovo Messico. Habitat: Praterie; asciugare i campi e i prati. Un fastidioso, persistente erbaccia, difficile da sopprimere, che appare localmente in alcuni degli stati orientali, viaggiando da agenzie di semi di erba o balle di fieno. Animali al Pascolo respingerla quando la crescita

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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. COMPOSITAB {COMPOSITE FAMILY) 547 Seed-time: July to September. Range: Wisconsin to the Plains of the Saskatchewan, southward to Missouri and New Mexico. Habitat: Prairies; dry fields and meadows. A troublesome, persistent weed, difficult to suppress, which is appearing locally in some of the Eastern States, traveling by the agencies of grass seeds or baled hay. Grazing animals reject it when growing because of the copious, bitter, and milky, juice; and when dried in hay its stems are too hard and woody to be eaten. It has a thick, deep-boring, woody root, from which several tufted stems arise, eight to eighteen inches high, erect, stiff, branching, round, and finely grooved. Lower leaves a half-inch to two inches in length, narrowly, lance-shaped to linear, the upper ones becoming much smaller, until near the top they are mere awl- like scales. Heads erect, solitary and terminal, about a half-inch broad, usually five-flowered, the rays five-toothed at the tips, rosy pink or light purple; involucre about a half-inch high, cylindric, with an inner row of five to eight linear bracts, scarious-margined, united at the base, and surrounded by several very short outer ones. Achenes very slender, nearly a Flo 379 _ Rush-iike quarter-inch long, round, tapering, truncate Lygodesmia (Lygodesmia at summit, with a copious, light brown iuncea:>- xi pappus by which they are freely wind-distributed. (Fig. 379.). Means of control Prevent seed development and distribution by early and repeated cutting*. Infested grass lands should be harvested before the first flowers mature, and should later be broken up for a cultivated cleansing crop before reseeding. For newly infested areas the. Please note that these images are extracted from scanned page images that may have been digitally enhanc

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectweeds
• bookyear1919