Erect annual, herb, 0.15-1.5 m high. Fl. white, Jan to Dec. Variety of soils. Weed of cultivation, waste places & roadsides.
Beard’s Provinces: Eremaean Province, Northern Province, South-West Province.
IBRA Regions: Avon Wheatbelt, Carnarvon, Central Kimberley, Coolgardie, Dampierland, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Murchison, Nullarbor, Pilbara, Swan Coastal Plain, Victoria Bonaparte, Warren, Yalgoo.
IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Cape Range, Central band, Nullarbor Plain, Eastern Goldfield, Eastern Mallee, Eastern Murchison, Edel, Fitzgerald, Fortescue, Geraldton Hills, Hamersley, Mount Eliza, Northern band, Carlisle, Northern Jarrah Forest, Perth, Pindanland, Recherche, Roebourne, Southern Jarrah Forest, Victoria Bonaparte P1, Warren, Western Mallee, Wooramel.
IMCRA Regions: Abrolhos Islands, Central West Coast, Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs): Albany, Armadale, Ashburton, Bayswater, Bridgetown-Greenbushes, Broome, Canning, Carnarvon, Cockburn, Cocos Islands, Collie, Coolgardie, Dandaragan, Dardanup, Derby-West Kimberley, East Pilbara, Esperance, Gingin, Gosnells, Greater Geraldton, Irwin, Joondalup, Kalgoorlie-Boulder, Kulin, Lake Grace, Manjimup, Menzies, Merredin, Narembeen, Narrogin, Northampton, Perth, Port Hedland, Ravensthorpe, Rockingham, Serpentine-Jarrahdale, Shark Bay, South Perth, Swan, Trayning, Wyalkatchem, Wyndham-East Kimberley.
Alternative Names. Argentine Fleabane, Wavy-leaf Fleabane.
General Biology. Growth form. Herb. Life form. Annual. Reproduction. Seed. Dispersal. Wind, water run-off. Seedbank persistence. At least 3 years. Fire response. Likely resprouts.
Notes. Does not compete well under high plant density or cover and requires disturbance to establish and persist. Light stimulates germination. Soil type and burial depth has significant effects on seed persistence and emergence. Predominantly emerges from the soil surface or burial depths of 0.5 cm. Has small lightweight seed that allows it to readily be dipersed long distances. Some biotypes have herbicide-resistance in parts of the world, however no glyphosate-resistant Conyza populations are recorded in the southeast of Western Australia.
Additional information. Origin. Neotropics. Similar exotic species. Conyza sumatrensis, C. parva, C. canadensis.
Suggested method of management and control. Generally more difficult to control than other species of Fleabane. Hand remove small and/or isolated infestations prior to seed set. Resprouts from basal buds after top removal. Timing of application is key to the efficacy of any herbicide treatment. Most susceptible to glyphosate at the rosette stage and least susceptible at flowering. Apply glyphosate when plants are small (at rosette stage <10cm across) 25 ml/ 10L after stem elongation and before flowering and actively growing. Otherwise 50% glyphosate can be used to wipe the stems of plants. At later stages, it is difficult to control with any single herbicide treatment. 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.
Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/