1 Integrated control 2 What is biological control? Water lettuce - - PDF document

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Oct 21, 2023 259 likes •334 views

Aquatic weed management in the Sand River Catchment Sand River Catchment Chandre L Rhoda & Chandre Rhoda & Louise Stafford Louise Stafford Aquatic weeds in the Sand River Catchment Red water fern Kariba weed Azolla filiculoides

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1 Aquatic weed management in the Sand River Catchment

Chandre L Rhoda & Louise Stafford

Chandre Rhoda & Louise Stafford

Sand River Catchment

Red water fern Azolla filiculoides Kariba weed Salvinia molesta Parrot’s feather Myriophyllum aquaticum Water lettuce Pistia stratiotes Water hyacinth Eichhornia crassipes

Aquatic weeds in the Sand River Catchment

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2 Integrated control

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3 What is biological control?

Using host specific natural enemies (insects, pathogens) to control invasive weeds It is not a quick fix Long-term (5 – 10 years) Sustainable, cost effective, environmentally friendly Works best when combined with other methods Monitor, evaluate, adapt

Water lettuce – Neohydronomus affinis

Parrot’s feather – Lysathia sp Salvinia – Cyrtobagous salviniae

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4 Azolla – Stenopelmus rafinasus

Relying 100% on biological control during western leopard toad breeding season

Mocke River Before Lysathia

Mocke River After Lysathia

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5 Bio-mass removal

Aquatic and Terrestrial weeds
Rubbish

Re-vegetation – Westlake River Re-vegetation Keyser’s River

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6 Annual Plan of Operation

Sand River Catchment schedule Jan – June 2014

Team 1 Team 2 Team 3 River Wardens NBAL January February March April May June

Westlake River Keysers River Prinskasteel River Prinseskasteel River Spaanchemat Princess Vlei Little Princess Vlei Mocke River Die Oog Paggasvlei Westlake wetlands Zandvlei