To make sure his plants are virus-free, this nursery owner never allows the roots to come into contact with the soil. Producing virus-free citrus plants for sale takes rigorous management, says Trevor McKenzie of Nucellar Nursery in Simondium, Western Cape. He produces under the Citrus Superplant Scheme, which means all the plants he grows must be certified by inspectors to ensure they conform to the scheme standards.
