Farm weeds of Canada . fly on limestone and on gravellyor poor soil. Injury: Most troublesome in rocky pastures. .Seed occasionally found111 clover and other crop seeds and as a bur in wool. Remedy: This biennal weed is easily destroyed on cultivated landand is seldom seen in fields kept under crop, but is much dreaded and en-quired about by farmers, presumably on account of its showy and weedyappearance. Pigeon Weed, Lithoxpermum, arvense, L. A seed which in form verymuch resembles that of Blueweed, and which is much oftener found in com-mercial seeds, is that of the Pigeon Weed, also called
Farm weeds of Canada . fly on limestone and on gravellyor poor soil. Injury: Most troublesome in rocky pastures. .Seed occasionally found111 clover and other crop seeds and as a bur in wool. Remedy: This biennal weed is easily destroyed on cultivated landand is seldom seen in fields kept under crop, but is much dreaded and en-quired about by farmers, presumably on account of its showy and weedyappearance. Pigeon Weed, Lithoxpermum, arvense, L. A seed which in form verymuch resembles that of Blueweed, and which is much oftener found in com-mercial seeds, is that of the Pigeon Weed, also called Red-root, Wheat-thief and Field Gromwell. The size and general shape of the two seeds is similar. That of PigeonWeed [Plate 56, fig. 70—natural size and enlarged 4 times] is rather lessangular and the surface is much smoother. Instead of having rough pro-jections, it is deeply and irregularly grooved, with prominent ridges betweenthe grooves. It may be easily recognized by the basal scar, which is oval or 68 Plaie OD. BLUEWE&D OR VIPE-RS BUOLOSSlEchium ,.> obtusely 3 to 5-angled in outline, and instead of the pit at inner angle andthe two conical projections on an excavated surface, has a convex surfacewith two light-coloured distinct cones, one at the inner angle and the otheropposite beyond the middle of the area. This weed is abundant in westernOntario and is troublesome in fields of fall wheat. It is a widely branchingbiennial or winter annual with white flowers, and produces a large crop ofseeds, which ripen early. The seed is commonly found in poorly cleaned fallwheat and rye and also in timothy, mammoth clover and alsike seeds. Landis best cleaned by adopting a short rotation, including grain sown in springinstead of in autumn. Plants which germinate in autumn can be destroyedby fall or spring ploughing. 69 PLATE BUR, Echmospermum Lappula, Lehm. Other Englisli names: Stictweed, Sheep Bur. Other Latin names: Myosotis Lajrpula, L.; Lappula Lappula (L.
Size: 1370px × 1824px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
