1. Critical reviews of biological pest control in South Africa. 593 II. The prickly pear, Opuntia ficus-indica (L.) Miller;D Annecke;J. Entomol. Soc. South. Afr,1978
2. Improved biological control of the prickly 596 pear, Opuntia megacantha Salm-Dyck;D Annecke;South Africa through the use of 597 insecticide,1969