[1] Agr Res Council Plant Hlth & Protect, Biosystemat, Nematol Unit, Private Bag X134, ZA-0121 Queenswood, South Africa
[2] North West Univ, Unit Environm Sci & Management, Private Bag X6001, ZA-2520 Potchefstroom, South Africa
[3] North West Univ, Lab Electron Microscopy, Private Bag X6001, ZA-2520 Potchefstroom, South Africa
[4] Univ Johannesburg, Dept Zool, POB 524,Auckland Pk, ZA-2006 Johannesburg, South Africa