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flag South Africa’s invasive oxygen weed has been fully eradicated from New Zealand’s Lake Ngatu after a five-year effort.

flag South Africa’s invasive oxygen weed has been eradicated from New Zealand’s Lake Ngatu after a five-year effort involving herbicide treatment, community collaboration, and ongoing monitoring. flag The 56-hectare lake, infested since 1988, was treated with Aquathol K in 2020, leading to rapid decline of the weed and recovery of native plants. flag No regrowth has been detected since 2020, marking the first known successful eradication of the species from a lake. flag Officials emphasize continued vigilance to prevent reinvasion by other pests like freshwater clams.

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