Tiny biocontrol insects, released by the Centre for Biological Control, are preventing flowering and suppressing growth — a long-term solution to South Africa’s most problematic aquatic invasive plant
Without biocontrol, Hartbeespoort Dam could be 70% covered in superweed
The tiny planthoppers are biological control agents and natural enemies of the world’s worst aquatic weed
About 80% of the country’s dams are so enriched with nutrients they could produce toxic algal blooms
Biological control is effective but the real solution would be to fix wastewater treatment plants in Joburg and Pretoria and stop sewage spills
Landowners and businesses in the Unesco World Heritage Site are up in arms over municipal sewage pollution
More than half of the sites showed a high health risk if water
was used for irrigation
Heavy rain and pollution has led to the aquatic weed increasing its coverage to about 50% of the dam
The coverage of the invasive superweed has been reduced to 12.5% from 40% in February
About 300 000 planthoppers have been released on Hartbeespoort Dam to control the green horror
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