Cirsium vulgare rosette CWS 1_Jenene Kidston : 無料・フリー素材/写真
Cirsium vulgare rosette CWS 1_Jenene Kidston / Macleay Grass Man
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Introduced, cool-season to annual to yearlong-green biennial C3 herb. It forms a rosette when young before sending up stems to 1.5 m tall. Leaves are dark green and warty, leaf edges lobed and spiny. Flowerheads are branched, with solitary (or clusters of) purple heads at the end of main branches; each head is bell-shaped, to 5 cm wide and surrounded by spiny bracts. Florets are tubular. Flowering is in late winter to summer. A native of Europe, North Africa and Asia, it is a common weed in disturbed, moister and more fertile areas of pastures and wastelands. Wind blown seeds are viable for up to 10 years and can travel large distances. Reduces the forage potential of pastures and the spines render it unpalatable to livestock and can cause eye injuries. Managed using a number of methods, but it is most important to use pasture management to avoid bare areas. Herbicides may be needed in the first year to reduce populations; they are most effective at the seedling to rosette stage. Slashing when the purple flowers just begin to emerge will minimise regrowth; earlier slashing can stimulate branching and flowering; considerable seed set can occur with later slashing. Low rates of herbicide followed by heavy grazing can be effective, especially if other broadleaf weeds are targeted. |
| 撮影日 | 2006-10-11 00:28:04 |
| 撮影者 | Macleay Grass Man , Dungog, Australia |
| タグ | |
| 撮影地 | |
| カメラ | FinePix S7000 , FUJIFILM |
| 露出 | 0.002 sec (1/450) |
| 開放F値 | f/6.3 |
| 焦点距離 | 15 mm |