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DescriptionSenecio madagascariensis plant13 (16143326805).jpg | Introduced, yearlong-green, annual or biennial, erect herb to 70 cm tall. Leaves are variable, mostly 2-8 cm long and lanceolate or elliptical, but never deeply dissected. Fllowerheads are loose clusters of yellow heads, each to 2 cm diameter. There are usually 13 (12-15) outer (petal-like) ray flowers and one row of 20-21 bracts. Flowering is year-round, but mostly from autumn to spring. A native of southern Africa, it is a common weed of pastures and disturbed sites. Most prolific on lighter-textured, acid, well-drained, low to medium fertility soils. Seeds are spread long distances by wind. More abundant where pastures are overgrazed or disturbed. Contains toxins that cause irreversible liver damage. Poisoning is usually chronic, leading to ill-thrift and eventually death if stock continue to graze it. Horses and cattle (especially young stock) are most susceptible, sheep less so, and goats the least. Not very palatable for cattle or horses, but goats and sheep will seek it out. More likely to be eaten if stock graze after slashing, as they cannot discriminate between fireweed and pasture. Best controlled using a number of methods, including strong pastures, grazing and herbicides. A dense, well-managed pasture can limit fireweed establishment, plant size and seed production. Hand pulling and bagging is very effective for controlling small/light infestations. Herbicides are most effective if used on smaller plants, preferably before flowering. |
Date | |
Source | Senecio madagascariensis plant13 |
Author | Harry Rose from South West Rocks, Australia |
This image was originally posted to Flickr by Macleay Grass Man at https://www.flickr.com/photos/73840284@N04/16143326805. It was reviewed on 26 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 May 2015
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current | 17:31, 26 May 2015 | 2,000 × 1,500 (1.39 MB) | Amada44 | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot A650 IS |
Exposure time | 1/640 sec (0.0015625) |
F-number | f/4 |
ISO speed rating | 80 |
Date and time of data generation | 12:52, 10 September 2008 |
Lens focal length | 9.855 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Picasa |
File change date and time | 13:45, 30 December 2014 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 12:52, 10 September 2008 |
Meaning of each component |
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Shutter speed | 9.3125 |
APEX aperture | 4 |
Exposure bias | 0 |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 13,745.704467354 |
Focal plane Y resolution | 13,698.630136986 |
Focal plane resolution unit | inches |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Unique image ID | 36bfae6952af1aa0eeffd5da48d3aede |
Keywords |
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IIM version | 4 |