Skip to main content
CORESTA Meeting, Agronomy/Phytopathology, Cape Town, 2001, PPOST 07

Study on the antagonistic mechanism of Trichoderma sp. for Phytophthora nicotianae and it's biocontrol effect

WANG Ge; LI Song; MA Yongkai; WANG Yingqi; ZHU Weiming; LI Zhengguo
HongTa Tobacco Group Co., R&D, Yuxi, Yunnan, China

In order to control the tobacco black shank disease by biological means, one isolate of Trichoderma sp. TR17 was obtained by the method of baiting. The antagonistic effect of TR17 against Phytophthora nicotianae (causal agent of the tobacco black shank disease) was assessed using P. nicotianae strains from diseased tobacco stems coming from different areas of Yunnan. Tests were carried out by pairing cultures on PDA. Results showed that TR17 was a strong antagonist to the black shank fungus. The antagonistic mechanisms appeared to be competitive growth and antibiosis. In the greenhouse, tobacco black shank control obtained using TR17 was as high as 97.6% (106 cfu/ml). In the field, with TR17 applied in the soil around the tobacco root at 4 g/root, the control was 67%.