A SYNOPSIS OF THE OCCURRENCE AND PATHOGENICITY OF PHYTOPHTHORA SPECIES IN MAINLAND CHINA

To date, 26 species of Phytophthora have been reported in mainland Chi na but only 23 are accepted as good taxa. Phytophthora nicotianae (P. parasitica) is the single most important species causing over 40 diffe rent plant diseases; P. boehmeriae is widespread attacking Gossypium, Boehmeria, Citrus, Broussonetia papyrifera and Pterocarya stenoptera; P. ''fragariae var. oryzo-bladis'' is unique to mainland China causing blight of Oryza sativa seedlings; P. megasperma sensu late has been i solated from Glycine max, Asparagus officinalis and Spinacia oleracea. In Hainan Province, P. heveae is present in the soil without causing apparent diseases to Hevea brasiliensis there.