Locations within which Ageratina adenophora is naturalised include Australia, southern Europe, Africa, Asia, New Zealand, south-western USA and many. Photo: Bart Wursten Ballantyne Park, Harare. Ageratina adenophora. Photo: Bart Wursten Ballantyne Park, Harare. Ageratina adenophora. Photo: Bart Wursten. A. adenophora has proved to be a very aggressive invasive species in some parts of the world, notably Australia, where it forced some farmers.

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Biological control has also been attempted in New Zealand and South Africa where both the gall fly and the fungus are established but, again with little impact on the weed Kluge, Though a number of agdratina plant species are noted as having negative health effects via the allergenic nature of their pollen e.

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This species tends to locally dominate exposed sites, where it excludes native species. Then, because of drought, a shortage of fertilizer and overgrazing, A.

There does not appear to be any specific preference for soil types, with A.

History of Introduction and Spread Top of page Introduced intentionally to many parts of the world as an ornamental during the s, this native of Central America is now naturalized and widely established as a serious weed in many tropical and sub-tropical areas, especially north-eastern and southern India between sea level and m, also Nigeria, South-East Asia, Pacific Islands, New Zealand and Australia.

Sheldon Navie the branched flower clusters at the tips of the stems Photo: Winning the war of Weeds: Carmichaelia exsul and Calystegia affinis.


Vector Transmission It is possible that seeds could attach to the hair, skin or feathers of animals with mud thus facilitating their spread.

Seeds may also contaminate stockfeed. In Australia, it was introduced as an ornamental species to the north coast of New South Wales around Trounce and Dyason, and soon colonized much of the newly cleared lands on both sides of the border between New South Wales and Queensland, where in it was recorded as naturalized on the Springbrook plateau above the Tweed Valley.

US Fish and Wildlife Service, When in flower, they can be easily distinguished by their bluish, purplish or pinkish-coloured flower-heads.

These multiple means of introduction mean that many pathways are possible for the accidental importation of A.

Ageratina adenophora (Croftonweed)

However, like so many flowering plants, it can set down a significant seed bank in the soil so that other mechanical control can become continuous.

Diversity and Distributions12, These restrictions agdratina prevent the use of one or more of the methods referred to, depending on individual circumstances. This species is a weed of roadsides, railways, pastures, fence-lines, disturbed sites, waste areas and waterways in sub-tropical and warmer temperate regions.

Small infestations can be dug out and exposing the roots.

A combination of fungal infestation of plants during wet periods and the impact of the stem galler has resulted in other plants growing in A. In Queensland and New South Wales, this species colonises forest margins, stream banks and disturbed areas, preferring shaded wetter areas but also growing in open sunny sites.

Factsheet – Ageratina adenophora (Crofton Weed)

It is also commonly found in urban open spaces, open woodlands, forest margins and rainforest clearings. Cattle find it unpalatable, sheep and goats eat it without apparent ill effect if other pasture is present, but horses, eating it readily, die as a result. Recovery Plan for Oahu Plants. One or more of the features that are needed to show you the maps functionality are not available in the web browser that you are using.


The small flower-heads i. The small compound flowers occur in late spring and summer, and are found in clusters at the end of branches. This page was last edited on 9 Novemberat Eupatorium adenophorum is a synonym. Silene lanceolata no common name. Notes on Natural Enemies Top of page Natural enemies were surveyed in the native range of the weed in Mexico by Osborne who drew attention to organisms of possible value as biological control agents.

Recovery Plan for Oahu Plants: Further details may be available for individual references in the Distribution Table Details section addenophora can be selected by going to Generate Report. It adenophira a declared noxious weed or Class A noxious plant in a number of US states where it is not yet present USDA-ARS,indicating its potential risks and impacts, and desire ageraatina it not to be introduced.

Ageratina adenophora reproduces by seeds which are easily dispersed by wind and float on water.