Although Emex control within pasture may not result in immediate profits, it is important in the long term to reduce the seed bank (Peirce, 1993) allowing the legume component of the pasture to enrich soil nitrogen within a pasture/crop rotation farming system (Gilmour, 1996).

In Australia, the grain industry (cereals, pulses and oilseeds) has restrictions on levels of contamination with Emex seed, ranging from 0 (zero) Emex seed/500mls of malt barley in South Australia to 20 Emex seed/500ml of feed barley or lupins in Western Australia.

Emex australis Steinh. Polygonaceae Juss. - Buckwheat family P.

Rumex hypogaeus (synonym Emex australis), commonly known in English as southern threecornerjack, [2] devil's thorn, [citation needed] or double gee[3] (also doublegee, from the old Afrikaner name dubbeltge-doorn - 'double thorned'), is a herbaceous plant of the Polygonaceae.

Lesser Jack, with its erect growth habit and a seed size similar to grain makes it potentially a far larger problem to the Australian grain-growing industry than the currently widespread Spiny Emex (CABI 2021).

Originally from southern Africa, Spiny Emex (Rumex hypogaeus) is a low-growing green annual herb with very sharp-pointed woody fruits. It is a widespread represented in all mainland states of Australia, particularly in temperate to arid and humid regions, and near absent from tropical areas.

[Cal-IPC] Mediterranean native, Ecological Threat: Emex spinosa (spiny Emex, devils thorn) is an annual (family Polygonaceae) found on California south coast. This Mediterranean native is not yet common in California, but it is spreading rapidly and is known to crowd out native species.

Doublegee or Spiny Emex is a ground-hugging or sprawling herb with 3 pronged prickles. The leaves are ovate, hairless and 20-70 mm long. It forms a rosette of leaves when young then produces sprawling weak vines up to a metre long.

Doublegee is a very widespread weed that can grow on a range of soil types. In WA it is mainly found on red-brown soils with neutral to slightly alkaline pH. Just 8–9 doublegee plants/m2 can reduce wheat yield by up to 50%. Doublegee first emerges as …

Aug 22, 2022 · This datasheet on Emex australis covers Identity, Overview, Distribution, Dispersal, Hosts/Species Affected, Diagnosis, Biology & Ecology, Environmental Requirements, Natural Enemies, Impacts, Uses, Prevention/Control, Further Information.