執行成果摘要
Soil samples were collected from three nature forests in Soil baiting method was used to isolate Phytophthora and Pythium. More than sixty Phytophthora and eighty Pythium isolates were isolated from those soil samples. Three species of Phytophthora including P. cinnamomi, P. katsurae and P. lateralis has been identified; Ten species of Pythium including P. splendens, P. spinosum, P. ultium, P. vexans, P. gracile, P. aphanidermatum, P. carolinianum, P. helicandram, P. deliense and P. oligandrum has been identified P. cinnamomi was the most dominant species in Phytophthora. The 52 isolates of P. cinnamomi were used to test their mating types. A1 and A2 mating types were 28 and 24 isolates, respectively that the ratio is about 1:1. The pathogenicity test of P. cinnamomi to two Taiwan Chamaecyparis species showed that it caused root rot of Chamaecyparis spp. but not showing symptoms on foliage.