1. Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
2. Nematology Unit, Biosystematics, Agricultural Research Council – Plant Health and Protection (ARC-PHP), Private Bag X134, Queenswood 0121, South Africa
3. Agricultural Research Council – Tropical and Subtropical Crops (ARC-TSC), Private Bag X11208, Mbombela 1200, South Africa