Citrus tristeza closterovirus in Morocco
Two major citrus germplasm blocks, Souihal and El-Menzeh, containing 372 and 560 species and cultivars, respectively, were investigated for Citrus tristeza closterovirus (EPPO A2 pest) by ELISA using CTV-specific polyclonal and monoclonal antibodies. A total of 1749 trees at Souihla and 2130 trees at El-Menzeh were tested. Nineteen cultivars represented by 67 in the first block and 6 cultivars represented by 23 trees in the second block were positive to CTV. The infection did not seem to have a random distribution in the two blocks. It was rather associated with some cultivars and limited to individual trees suggesting lack of natural spread of the virus.
Sources
Nadori, E.B.; Zebzami, M. (1992) Citrus germplasm blocks control for citrus tristeza virus by enzyme-linked immunosorbent assay in Morocco.
Arab and Near East Plant Protection Newsletter 14, 20.