File:CSIRO ScienceImage 3265 Damage caused to Scotch thistle Onopordum sp by the biological control agent Lixus cardui a weevil.jpg
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editDescriptionCSIRO ScienceImage 3265 Damage caused to Scotch thistle Onopordum sp by the biological control agent Lixus cardui a weevil.jpg |
English: The Thistle Stemborer Weevil , Lixus cardui, is an introduced biological control agent for the pasture weed Onopordum sp. Adult weevils are elongate, up to 15 mm long and 5 mm wide. They are brownish when young, turning blacker with age. This is the only stage normally visible, as eggs are laid into holes bored into the stem. The large white larvae remain inside the stem and feed on plant tissue. The stem-boring weevil was first released in Australia in 1993. This was followed up by an active redistribution process that lasted until 2000. The stem-borer is now distributed across the range of Onopordum thistles in eastern Australia. |
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Source | http://www.scienceimage.csiro.au/image/3265 |
Author | division, CSIRO |
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current | 05:30, 19 September 2014 | ![]() | 1,622 × 1,058 (1.98 MB) | File Upload Bot (99of9) (talk | contribs) | {{User:99of9/CSIRO_template |id=3265 |Title=Damage caused to Scotch thistle (Onopordum sp) by the biological control agent Lixus cardui, a weevil. |Creator=division |Creator_scheme=LCNA |Date=2006-10-20 |Date_scheme=ISO8601 |Description=The Thistle Ste... |
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Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop 7.0 |
File change date and time | 13:21, 20 October 2006 |
Color space | Uncalibrated |
Writer | Sharon Corey |
IIM version | 2 |