Pest plants (Weeds)
Pest plants must be managed because they can have significant impacts on industries and the environment.
Declared pest plants
Pest plants that are a significant threat to agriculture, the natural environment and public health and safety are called declared plants. Land owners have a legal responsibility to manage these plants. The Landscape South Australia Act 2019 (the Act) sets out the legal framework for:
- banning the sale of declared weeds (Plants banned from sale in South Australia)
- controlling the movement of declared weeds
- destroying or controlling infestations of declared weeds (Weed control handbook for declared plants in South Australia - 2018)
- notifying authorities when an infestation is detected.
What is being done to manage pest plants?
The Northern and Yorke Landscape Board has a clearly defined approach to managing pests. This helps improve detection and response to new and existing pests based on their invasiveness, impact, potential distribution and feasibility of containing it.
How we can help you
Northern and Yorke Landscape Board staff are available to help you plan your approach to pest plant control. Staff can provide you with technical support, information resources and in some cases incentives to help you control pest plants. Contact us to find out more.
Our staff also ensure that declared plants are controlled as per the Northern and Yorke Landscape Board's responsibilities under the Act.
Correct use of chemicals for weed control
We can provide advice on the use of chemicals to control pest plants. It is important that chemicals such as herbicides and pesticides are used correctly. Incorrect use can impact human health and the health of the environment. Many people apply up to five times more chemical than is needed to kill the plants being targeted. This is a huge waste of time and money and can be counterproductive as it can kill the foliage of the plant before reaching the roots and so allow the weed to regrow. Excess chemicals can also run off, impacting soils, native plants and animals, and stormwater and waterways.
Priority weeds in the Northern and Yorke region
- Lower Mid North District - Managing pest plants factsheet
- Southern Flinders Upper North District - Managing pest plants factsheet
- Yorke Peninsula District - Managing pest plants factsheet
Each district in the Northern and Yorke region has a Weed Action Plan, which identifies the priority weeds and how we will manage them over a five-year period.
Common name: Alligator weed
Scientific name: Alternanthera philoxeroides
Status: State Alert. Notify Landscape Board immediately if found.
Declared: must be destroyed, banned from sale.
Common name: Arum lily
Scientific name: Zantedeschia aethiopica
Status: Declared: must be controlled (doesn't apply to ones planted >100m from wetland/watercourse). Plant must not be sold.
Common name: Bladder campion
Scientific name: Silene vulgaris
Common name: Boneseed
Scientific name: Chrysanthemoides monilifera
Common name: Bridal veil
Scientific name: Asparagus declinatus
Status: Weed of national significance
Common name: Cutleaf mignonette
Scientific name: Reseda lutea
Common name: Hoary cress
Scientific name: Cardaria draba
Common name: Olive
Scientific name: Olea europaea
Common name: Serrated tussock
Scientific name: Nassella trichotoma
Status: Declared: notify Landscape Board immediately if found, must be destroyed, banned from sale.
Common name: Silverleaf nightshade
Scientific name: Solanum elaegnifolium
Status: Weed of national significance
Silverleaf Nightshade Webinar
Common name: Skeleton weed
Scientific name: Chondrilla juncea
Common name: Texas needlegrass
Scientific name: Nassella leucotricha
Status: Declared: notify Landscape Board immediately if found, must be destroyed, banned from sale
Common name: Water hyacinth
Scientific name: Eichhornia crassipes
Status: State Alert. Notify Landscape Board immediately if found. Declared: must be destroyed, banned from sale.
Common name: Yellow burrweed
Scientific name: Amsinckia intermedia
Status: Priority pest plant