What is meant by alien plants?
The Department of Environmental Affairs defines invasive alien plants as plant species that are exotic, non-indigenous or non-native to an ecosystem.
What are alien invasive plants?
Invasive alien plant species (IAP) are species whose introduction and/or spread outside their natural distribution threaten biological diversity. They are non-native to an ecosystem, and may cause economic or environmental harm.
Where do alien plants come from?
A great deal of South Africa’s water is used by plants that do not belong here. They are called “invading alien” plants. These plants are invasive because they spread and displace our natural trees and plants. They have invaded large areas of good agricultural land and some of our most scenic areas.
Why alien plants were imported to South Africa?
Many alien species were imported for commercial rea- sons (such as forestry) or as ornamental garden plants. … About 10% of these are considered inva- sive plants. This is because of their aggressive qualities, and their capac- ity to invade natural habitats and overwhelm some, or even all of the indigenous vegetation.
What are examples of alien plants?
The most threatening alien plants in the Western Cape according to Cape Nature are:
- Black Wattle.
- Port Jackson.
- Silky hakea.
- Long-leafed wattle.
- Australian Myrtle.
- Spider gum.
How do alien plants spread?
Invasive plants are plants that are intentionally or accidentally introduced by humans into areas outside of their natural habitat. These species can spread rapidly with negative consequences for native species. … Once an alien plant has invaded a habitat, it changes the conditions of that environment.
Are pine trees alien to South Africa?
The earliest record of introduced alien tree species (pines) invading natural vegetation in South Africa is from about 1855, when Pinus halapensis was noted to be spreading into the fynbos biome (Richardson and Higgins, 1998). … pinea reached South Africa in about the middle of the eighteenth century, while P.
How can people spread the seeds of alien plants without knowing?
Question – How can people spread the seeds of various alien plants without knowing that they are doing this? … By clothes – Seeds may stick to clothes like socks, shoes, sweaters etc. By cars – They may stick to any vehicle on the tire or by wind.
How do I get rid of alien plants?
Some alien plants require just a foliar spray while others will need to be cut down first and herbicide applied to the stump of the plant. Foliar spraying is more effective when the plant is growing vigorously, usually in the summer months. Avoid spraying during hot weather, rain or on windy days.
What is the difference between alien invader plants and indigenous plants?
A plant is indigenous to an area, if it would naturally be found there without mans influence. … Naturalised plants are those that have been introduced into an area, but are surviving and spreading without man’s help. Naturalised plants tend to become aliens if they are particularly well suited to their environment.
Why are invasive species so successful?
Invasive species are often successful in their new ecosystems because they can reproduce and grow rapidly or because their new environment lacks any natural predators or pests. As a result, invasive species can threaten native species and disrupt important ecosystem processes.
What plants are indigenous to South Africa?
12 edible indigenous South African plants
- Pelargonium culallatum (wild malva) …
- Pelargonium tomentosum (peppermint-scented pelargonium) …
- Coleonema pulchellum (confetti bush) …
- Oxalis pes-caprae (wild sorrel) …
- Artemesia afra (African wormwood) …
- Carissa macrocarpa (num-num) …
- Tulbachia violacea (wild garlic)
Is the most effective method of controlling the invasive species in the ecosystem?
This includes digging, flooding, destruction and removal of nests, hand-pulling, burning and general destruction of the invasive species by hand. … The least labour-intensive option, chemical control on its own is usually the most effective option, as it can target specific species and will kill them guaranteed.