Science and Education Publishing World Journal of Agricultural Research 2333-0678 2 6 2014 12 19 The Diversity and Antagonistic Ability of Trichoderma spp. on the Aspergillus Flavus Pathogen on Peanuts in North Center of Vietnam 291 295 EN Nguyen Thi Thanh Vinh University, Vinh, Vietnam Ho Thi Nhung Nguyen Thi Thuy Thai Thi Ngoc Lam Phan Thi Giang Tran Ngoc Lan Nguyen Van Viet Vu Trieu Man WJAR2014268 10.12691/wjar-2-6-8 2014 09 09 2014 11 10 2014 12 19 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).