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Johannesburg City Parks and Zoo tackle invasive species
Johannesburg City Parks and Zoo launches the National Invasive Species Week in Roodeport on 11 October, 2016.
National Invasive Species Week is an awareness and action programme that aims to protect the environment, agriculture and other industries from the threats of invasive plants.
The City Park’s key message for this year’s Invasive Species Week celebration says “Don’t lose water or natural resources to alien invasive species!”
The public is encouraged to remove any invasive plants that grow on or near watercourses as they take up a lot of water.
Some of the water invaders in South Africa were introduced as ornamentals. They have now successively spread to the environment causing a negative transformation on our water bodies.
Aquatic invasive alien plants invade wetlands, rivers, dams and estuaries, causing problems such as oxygen deficiencies in the water, dense biomass that block pump inlets, restrictions to the use of boats for fishing and recreation and reduced flow of water in canals.
On 11 October, a joint operation will be conducted at Helderkruin in Region C to fight the spread of alien plants growing in the area, specifically black wattle trees (Acacia mearnsii) and bugweed (Solanum mauritianum).
Some examples of invasive plants found near rivers, dams and streams include:
- Water hyacinth (Eichhornia crassipes) – Category 1b
- Yellow flag iris (Iris pseudacorus) – Category 1a
- Giant reed (Arundo donax) – Category 1b
- Indian shot (Canna indica) – Category 1b