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Investigating two different chemical control options for Water poppy
Menzi Nxumalo and Reshnee Lalla - Invasive Species Programme, SANBI
Water poppy (Hydrocleys nymphoides) an aquatic plant native to South America, has demonstrated invasiveness in several countries.
In South Africa, its distribution is limited to one naturalised population, recently detected in a dam in the KwaZulu-Natal Midlands region.
Due to the domestic and agricultural uses of the dam, the use of herbicides as a control options was not feasible and other control methods had to be investigated.
This study aimed to compare two different mechanical control options that are recommended for aquatic systems used for domestic purposes.
The first entails physical removing all parts of the plant using an aquatic rake, and the second is a plant shading method in which target plants are covered with basic plastic that provides 100% shade cover.