|Copyright: Anastasia Gansula (TurquoiseRose) (10)|
|Date Taken: 2006-07-17|
|Photo Version: Original Version|
|Date Submitted: 2008-11-22 10:43|
|[Note Guidelines] Photographer's Note|
|A native annual or biennial weed of arable land and waste ground, common on all lowland soils except chalk. Scentless mayweed is abundant throughout the UK but the distribution is determined by the location of cultivated land. It is recorded up to 1,750 ft. It is moderately resistant to trampling and compaction but it does not thrive in high summer temperatures or drought. It is intolerant of dense shade and waterlogging. It responds to increased levels of soil fertility, particularly to applications of manure. |
Scentless mayweed is very variable in size and habit. Some populations have developed resistance to certain hormone herbicides. A diploid form predominates in Britain and Northern Europe. In continental Europe, a tetraploid form is predominant that may exhibit perennial growth. There is some evidence that winter and summer annual forms occur. Hybrids have been reported with other mayweed species but these were sterile.
Scentless mayweed is not palatable to livestock and is avoided by hens. It is a host of several insect pests but is also a source of nectar and pollen for beneficial insects. The sap contains an anti-viral agent that inhibits the growth of polio and herpes viruses.
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