File:Spotted Knapweed (Centaurea maculosa).jpg
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DescriptionSpotted Knapweed (Centaurea maculosa).jpg |
Spotted knapweed is an invasive weed. The weed is a prolific seed producer with 1000 or more seeds per plant. Seed remains viable in the soil five years or more, so infestations may occur a number of years after vegetative plants have been eliminated. Spotted knapweed has few natural enemies and is consumed by livestock only when other vegetation is unavailable. The plant releases a toxin that reduces growth of forage species. Areas heavily infested with spotted knapweed often must be reseeded once the plant is controlled. Historical records indicate that spotted knapweed was introduced from Eastern Europe into North America in the early 1900s as a contaminant in crop seed. It now infests several million acres of grazing land in the northwestern United States and Canada. Reference <a href="http://www.ag.ndsu.edu/pubs/plantsci/weeds/w842w.htm" rel="nofollow">www.ag.ndsu.edu/pubs/plantsci/weeds/w842w.htm</a> Observed in a Canadian Provincial park at Lake Lakelse |
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Date | |||||
Source | Flickr: Spotted Knapweed (Centaurea maculosa) | ||||
Author | Alan Vernon | ||||
Permission (Reusing this file) |
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:04, 14 September 2011 | 1,024 × 683 (431 KB) | Flickr upload bot (talk | contribs) | Uploaded from http://flickr.com/photo/32541690@N02/6125996856 using Flickr upload bot |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 7D |
Copyright holder | Alan Vernon 2011 |
Exposure time | 1/500 sec (0.002) |
F-number | f/8 |
ISO speed rating | 800 |
Date and time of data generation | 13:17, 19 July 2011 |
Lens focal length | 400 mm |
Width | 3,996 px |
Height | 2,664 px |
Compression scheme | Uncompressed |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop Elements 8.0 Windows |
File change date and time | 17:13, 2 September 2011 |
Exif version | 2.21 |
Date and time of digitizing | 13:17, 19 July 2011 |
APEX shutter speed | 9 |
APEX aperture | 6 |
APEX exposure bias | 0 |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 5,715.5458984375 |
Focal plane Y resolution | 5,808.4033203125 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |