eng Science and Education Publishing World Journal of Agricultural Research 2333-0678 2014-12-19 2 6 291 295 10.12691/wjar-2-6-8 WJAR2014268 article Nguyen Thi Thanh phuongthanh1908@gmail.com 1 Ho Thi Nhung 1 Nguyen Thi Thuy 1 Thai Thi Ngoc Lam 1 Phan Thi Giang 1 Tran Ngoc Lan 2 Nguyen Van Viet 3 Vu Trieu Man 4 Vinh University, Vinh, Vietnam Institute of Regional Research and Development, Ha Noi, Vietnam Vietnam Academy of Agricultural Sciences, Ha Noi, Vietnam Phytopathological Society of Vietnam, Research Centre for Plant and Animal Health, Hanoi, Vietnam Among 1000 peanut soil samples were collected from Nghe An province, Thanh Hoa province and Ha Tinh province, 44.90% samples occurred Trichoderma. The appearance ratio of Trichoderma in Nghe An, Thanh Hoa, Ha Tinh is 44.30%, 52.00% and 39.50%, respectively. By using in the dual culture method on PDA, The Percent Inhibition of Mycelial Growth (PIRG) was determined to be very high in 28 Trichoderma strains (made up 28.3% in total), 29 others strains was dertermined that to be high PIRG (made up 29,3% in total). The highest PIRG was 100%, occurred on T. harzianum (Tri.019(4).NC; Tri.053(1).TG; Tri.011(1).NL; Tri.002(2).NX strain), T. atroviride (Tri.020(2).NC; Tri.011(1).NC strain), T. reesci (Tri.007(1).N?), T. hamatum (Tri.039(1).TG), T. virens (Tri.014(4).NC) and T. pseudokonigii (Tri.014(1).NL). http://pubs.sciepub.com/wjar/2/6/8/wjar-2-6-8.pdf Antagonistic ability Aspergillus flavus Diversity PIRG Trichoderma