Article: Blue Billygoat
Common Name
Floss Flower, Blue Billygoat weed, Bluemink, Pussy foot, Mexican Paintbrush
Scientific Name
Ageratum houstonianum
Family
Asteraceae
Lifecycle
Annual or Short-lived Perennial
Seasons of Growth
Blue Billygoat Weed flowers throughout the year in suitable climates, particularly thriving in the warmer months.
Key Distinguishing Feature
Leaves: Triangular to ovate with bluntly toothed margins and soft hairs. Opposite at the base and alternate higher up the stem. Flowers: Small, fluffy flower heads in terminal clusters, colors include blue, purple, pink, and white. Stems: Soft, hairy, and can emit a strong odor when crushed. Fruit: Brown, dry fruit containing black seeds about 2 mm long, topped with chaff-like scales.
Blue Billygoat Weed, scientifically known as Ageratum houstonianum, is an annual or short-lived perennial herb that typically grows to a height of 0.3 to 1 meter. It is native to Mexico, Central America, and the Caribbean and has been introduced to many other regions, including Australia, where it is considered a significant environmental weed. The plant is characterized by its soft, hairy stems and leaves, and produces showy, fluffy flower heads in shades of blue, purple, pink, or white. The leaves are simple, triangular to ovate in shape, and finely serrated.
Methods of Control
Physical Removal:
- Hand-pulling small plants, ensuring the removal of all roots to prevent regrowth.
- Mechanical removal for larger infestations, followed by herbicide application to manage regrowth.
Chemical Control:
- Metsulfuron-methyl: Applied at a rate of 1 g/10 L with a surfactant. It is effective for broad-leaved weed control and has low toxicity to non-target organisms.
Prevention:
- Avoiding the spread by cleaning vehicles, machinery, and footwear that have been in infested areas.
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