Click on images to enlarge. Agrostis monostachya Poir. Hymenachne myosurus Rich. Nees Panicum amplexicaule Rudge Panicum amplexicaule Rudge var. It is spreading throughout the tropical wetlands of northern Australia and is most common in the coastal districts of northern Queensland and the Northern Territory.

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Native to South America, hymenachne is a robust, rhizomatous, perennial grass. Originally introduced to Australia to provide ponded pasture for cattle, it is now found from far north Queensland to Casino in New South Wales, and in the top end of the Northern Territory. Hymenachne has become an unwanted pest of streambanks, shallow wetlands and irrigation ditches, primarily in the coastal Wet Tropics of northern Queensland.

In some areas it has invaded low-lying sugarcane fields, fish habitats and natural wetlands with high conservation value. Hymenachne damages wildlife habitats and irrigation channels, and degrades recreational water quality.

See the Hymenachne fact sheet PDF, 1. Panama disease tropical race 4 confirmed in Far North Queensland. Check if you're registered as a biosecurity entity. Fall armyworm detected in Queensland.

Find assistance and support for coronavirus affected businesses and industries. Restricted invasive plants. Home Industries Farms, fishing and forestry Agriculture Land management Health, pests, weeds and diseases Weeds and diseases Invasive plants Restricted invasive plants Hymenachne.

Hymenachne is a restricted invasive plant under the Biosecurity Act Scientific name Hymenachne amplexicaulis. Similar species Native hymenachne H. Description Robust, rhizomatous, perennial grass, up to 2. Stems are erect and pithy. Leaf blades are cm long, up to 3cm wide. Flower heads are spike-like, cylindrical, cm long. Habitat Prefers streambanks, shallow wetlands and irrigation ditches.

Life cycle Flowering occurs April-June. Seeds set from late autumn to early spring. One flower stalk can produce more than seeds. Affected animals Fish Humans Native Animals. Impacts Environmental Affects drains, lagoons, wetlands, creeks and rivers. Increases flooding by reducing flow capacity of drainage networks. Interferes with wildlife habitats. Economic Interferes with irrigation and infrastructure. Social Degrades water quality for recreational purposes.

How it is spread Seeds spread by water movement and migratory aquatic birds. Prevention Find out how farmers can prevent weed spread. Find out how gardeners and outdoor enthusiasts can prevent weed spread. Heavy earth-moving machinery can be effective. Fire is a tool for the dry season. When integrated with other control methods, fire can improve overall results and reduce cost. Herbicide control No herbicides are currently registered. However, off-label minor use permits are available.

Spraying an entire heavy infestation can cause hymenachne to sink and result in biological hazards from rotting vegetation. Large masses of decomposing hymenachne may use all oxygen in water, leading to fish kills.

Avoid this problem by spraying strips of weed. Biological control No biological control agents released in Australia. Should a biological program commence, agents sought would need to be specific for olive hymenachne to ensure no impacts on native species H. Legal requirements Hymenachne is a restricted invasive plant under the Biosecurity Act It must not be given away, sold, or released into the environment without a permit.

The Act requires everyone to take all reasonable and practical steps to minimise the risks associated with invasive plants and animals under their control. This is called a general biosecurity obligation GBO. At a local level, each local government must have a biosecurity plan that covers invasive plants and animals in its area. This plan may include actions to be taken on certain species. Some of these actions may be required under local laws.

Contact your local government for more information. Last reviewed: 31 Oct Last updated: 19 Jun Print Page. Sign up for biosecurity alerts Panama disease tropical race 4 confirmed in Far North Queensland Check if you're registered as a biosecurity entity Fall armyworm detected in Queensland. I want to Check my biosecurity entity registration Sign up for biosecurity alerts Apply for a biosecurity instrument permit Look up pest and disease biosecurity zone maps Access FishNet Access Macropods Online.

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A large spreading grass with thick pithy stems. These stems are often trailing or creeping sometimes floating on water and regularly produce roots at their joints. Its leaves have large, relatively broad, stem-clasping leaf blades cm long and cm wide. Its elongated seed-heads are spike-like in appearance cm long and 0. They contain numerous individual flower spikelets that are mm long.


Weeds of Australia - Biosecurity Queensland Edition Fact Sheet

Online image request form. This species appears on the following legally prohibited plant lists. Cypress Lake Study Information. Diaz, W. Overholt and J. Hymenachne amplexicaulis is occasionally found growing in wet pastures from the central peninsula to Collier county.

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