During 1988~1990, many diseased tissues and soils infected with foot rot of citrus were collected from citrus orchards in Hainan and Zhanjiang. A total of 48 isolates of Phytophthora spp. were obtained and all isolates were identified to be:P. parasitica Dast, P. Citrophthora R. E. & E. H. Smith and P. Capsici Leonian. P. Capsici is a new record in citrus orchard. in China All ofthem were pathogenic to citrus. It was considered that P. parasitica and P. citrophthora were the main causal agent of foot rot of citrus in those two regions because they have a high frequency of occurrence A1 mating type of P. parasitica is dominant.
Zhang Kaiming, Li Yidong, Zheng Fucong.
IDENTIFICATION AND MATING TYPE OF PHYTOPHTHORA SPECIES ON CITRUS TREES IN HAINAN AND ZHANJIANG[J]. Acta Phytopathologica Sinica, 1993, 23(2): 179-185