Environmental weeds are plants that do not naturally occur in an area and can invade areas of natural habitat. They are usually introduced from other countries or areas and spread to bush land and areas of natural vegetation, where they become weeds, threatening the survival of native species. Over 170 species of environmental weeds occur in Mackay.
Site Specific Weeds Below you will find a detailed list of the local priority weeds. However they are not really relative to the site where we will be located as a lot of them are commonly found around waterways, wetlands or coastal areas. We are conducting site surveys currently and will be providing another detailed list. One that comprises all the site specific weeds and a map that shows that hot spots. Stay tuned for more info.
Priority weeds The Central Queensland Regional Pest Management Group has chosen the following 15 pest plants as high priorities for control in the region. Not all of them are present on the Tree Psyde site, but we wish to educate you on all the local weeds so that you may help eradicate them where ever you may be.
\\ Mimosa pigra Giant Sensitive Tree forms dense, impenetrable thickets, 3-6m high, establishing on waterways, floodplains and wetlands. In the Northern Territory, over 80,000 ha of floodplains have been invaded by Giant Sensitive Tree.
\\ Giant Rat's Tail Grass Giant Rat's Tail Grass is an aggressive grass that can reduce pasture productivity and out-compete desirable pasture grasses. It was introduced from Africa during the 1960's as a contaminant in pasture seed. It has adapted well to Queensland conditions.
\\ Sicklepod Sicklepod (Senna obtusifolia) is a vigorously growing, very competitive, woody shrub which grows 1.5-2.5m tall and 1m wide. It is normally an annual, but plants which have been slashed or survive chemical treatment often re-shoot, flower and last for a further year.
\\ Parthenium Parthenium weed is an annual herb with a deep tap root and an erect stem that becomes woody with age. As it matures, the plant develops many branches in its top half and may eventually reach a height of 2 meters.
\\ Hymenachne Originally introduced to provide ponded pasture for cattle, Hymenachne has become a pest of stream banks, shallow wetlands and irrigation ditches. In some areas it has invaded low-lying sugar cane, fish habitat and natural wetland areas with high conservation value.
\\ Rubbervine Rubbervine is a vigorous climber with twining, whip-like shoots which can grow unsupported as an untidy, many-stemmed shrub, 1-2m high. It can also scramble up to 30m high in trees.
\\ Salvinia Salvinia molesta is a Weed of National Significance in Australia. It can rapidly form mats that completely cover water storages, affecting water quality, water flow, wildlife, irrigation and recreational activities including fishing and swimming.
\\ Water Hyacinth Originally introduced to Australia as an aquatic ornamental plant, Water Hyacinth has become a major pest of rivers and dams. Not only does it destroy native habitats, but it also seriously depletes water bodies of oxygen, increases water loss and provides a breeding ground for mosquitoes.
\\ Water Lettuce Water Lettuce is a free floating aquatic weed that rapidly forms dense mats covering rivers, dams and irrigation canals. It can restrict water flow, increase water loss by transpiration and serve as a breeding ground for mosquitos. Water Lettuce spreads both by vegetative reproduction and by seeds.
\\ Singapore Daisy Singapore Daisy is a vigorous ground cover with lush, glossy green leaves. The leaves are usually three lobed and in pairs up the stem. It produces yellow to orange daisy flowers about 2 cm across. It flowers all year round. The flowers are held above the leaves on short stalks.
\\ Bellyache Bush Bellyache Bush (Jatropha gossypiifolia) is often confused with Castor Oil Plant (Ricinus communis). Both plants are frequently found in the same areas. Bellyache Bush is a squat, thick-stemmed shrub 2.5-4m tall, which develops from a short, single stemmed plant, with three or four young leaves sprouting from the top.
\\ Prickly Acacia Prickly Acacia is a thorny shrub or small tree growing 4-5m high, although in ideal conditions it can reach up to 10m. The umbrella shape of the prickly acacia tree and the distinctive pods are characteristic features. The young shrubs form dense thorny thickets, while mature trees are usually single stemmed, with spreading branches that are mainly thornless.
\\ Parkinsonia Parkinsonia aculeata is a thorny shrub or small tree. It was introduced as an ornamental shade tree in around 1900. Since then, it has progressed to be a major weed and today infests large areas of Queensland and other states, amounting to 800,000 ha nationally, primarily along waterways.
\\ Giant Sensitive Plant Giant Sensitive Plant is a shrubby or sprawling annual, that can behave like a perennial vine in certain years. Stems bunching, often scrambling over other plants, with a line of sharp, hooked prickles.
\\ Mother of Millions Mother of Millions (Bryophyllum species) are escaped ornamental plants from Madagascar. Five species are commonly naturalised in Queensland; three of these are spreading over substantial areas. Mother of Millions is highly toxic to stock and because of its succulent features, is well adapted to dry areas.