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The Kariega facility focuses on the rearing of agents for alien invasive cacti, which are serious environmental and agricultural weeds throughout South Africa. Biological control of cacti has been very successful in both South Africa and Australia. The very first biological control agent introduced into South Africa was a cochineal insect which targeted the drooping prickly pear Opunita monocantha over years ago. Drooping prickly pear was a major problem in the Eastern Cape Province at that time, covering large areas of bush and grazing land in high densities. After the release of the cochineal insect there was a dramatic decline in drooping prickly pear populations and it is no longer considered a problem. At present, six species of agents are being mass-reared on six cactus weeds at the Kariega facility see table below. All but one Pereskia stem-wilter of the agents are types or species of cochineal. Cochineal insects are a genus of scale insects which feed only on cacti in the genus Opuntia. Each different cochineal species specialises in feeding on one particular weed species so it is essential that the correct type of cochineal is used to control the correct weed. A team of eight people are employed to mass-rear and release these agents. Farmers, conservationists and landowners make requests and the agents are provided free of charge. The team is also involved in monitoring how effective the releases are in controlling the weeds. If you have a problem with invasive cacti please contact the CBC and we will advise on the best way of controlling that species and provide you with control agents if appropriate. The Kariega mass-rearing facility is managed by Ruth Scholtz and she can be contacted on: Phone: Email: scholtzruth4 gmail. Imbricata cochineal Dactylopius tomentosus 'imbricata type'. Pereskia aculeata Pereskia. Please let us know if there are any broken links or outdated content on this page Click here to report Sent your message successfully! Error Sorry there was an error sending your form. Invasive Plant. Biological Control Agent. Opuntia aurantiaca Jointed cactus. Jointed cactus cochineal Dactylopius austrinus. Cylindropuntia imbricata Ibricated cactus. Opuntia monacantha Drooping prickly pear. Monacantha cochineal Dactylopius ceylonicus. Opuntia stricta Australian pest pear. Stricta cochineal Dactylopius opuntiae 'stricta type'. Queen of the nigh mealy bug Hypogeococcus festerianus.