Conyza parva Cronquist
Bull.Torrey Bot.Club 70:632 (1943)

Conservation Code: Not threatened
Naturalised Status: Alien to Western Australia
Name Status: Current

Brief Description
Amanda Spooner, Tuesday 4 April 2000

Erect annual, herb, 0.2-2.5 m high, stems & leaves not noticeably hairy. Fl. white-cream, Jan to Mar. Sandy & loamy soils. Road verges, waste places.


Beard’s Provinces: South-West Province.

IBRA Regions: Esperance Plains, Jarrah Forest, Swan Coastal Plain, Warren.

IBRA Subregions: Fitzgerald, Perth, Southern Jarrah Forest, Warren.

IMCRA Regions: Leeuwin-Naturaliste, WA South Coast.

Local Government Areas (LGAs): Albany, Armadale, Augusta Margaret River, Busselton, Cambridge, Cockburn, Cranbrook, Donnybrook-Balingup, Gosnells, Joondalup, Manjimup, Nannup, Perth, Rockingham, Serpentine-Jarrahdale, South Perth, Wanneroo, Waroona.

Management Notes (for the Swan NRM Region)
Kate Brown and Karen Bettink, Monday 26 August 2019

General Biology. Growth form. Herb. Life form. annual. Reproduction. By Seed. Dispersal. Wind Dispersal. Seedbank persistence. Closely related species are viable in the soil for 1-2 years.

Notes. Erect annual herb 50 cm to 80 cm high, sparsely hairy, stems leafy and unbranched. Leaves linear to oblong, mostly 3–4.5 cm long, 1–5 mm wide..

Additional information. Origin. Native to South America.

Suggested method of management and control. Hand pulling is effective but prevent the plant from breaking as it will regrow from the base. A mixture of 1 L glyphosate(450g/L) plus 2 L water can be used to wipe the stems of plants. Lontrel®750 at 200 g/ha or 4 g plus 25 mL wetting agent in 10 L water can be used for fairly selective control in bushland. Isolated patches can be sprayed with a mixture of 50 mL Tordon®75-D in 10 L water for control of plants and residual control of seedlings. For large, old infestations, split sprays using 2 L/ha glyphosate(450g/L) or 2 L/ha 2,4-D amine(625g/L) followed 3-7 days later by 2 L/ha paraquat(250g/L) has provided the best control. Read the manufacturers' labels and material safety data sheets before using herbicides. For further information consult the Australian Pesticides and Veterinary Medicines Authority to determine the status of permits for your situation or state.

Management Calendar

Calendar Type Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Comments
Flowering Y Y Y Y Y             Y  

Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.



Project information and acknowledgements