Author Affiliations +
J.H. Hofmeyr,1,* J. Pretorius2
11Citrus Research International (Pty) Ltd, P.O. Box 212, Citrusdal, 7340 South Africa
22Paragon System Design (Pty) Ltd, P.O. Box 3087, Somerset-West, 7129 South Africa
*To whom correspondence should be addressed. E-mail: hofmeyr@xsit.co.za