Trichoderma  isolate Mycelial growth (mm) Reduction over control (%)
THK 27.7 c* 69.0 c
THA 23.0 a 74.0 a
TVP 38.3 e 57.0 d
TVE 35.7 d 59.6 d
TVC 36.0 d 59.2 d
THO 25.0 b 71.7 b
THN 25.7 b 71.0 b
Control 88.3 f -
THK: Trichoderma harzianum Karur; THA: Trichoderma viride Annamalai University-Chidambaram; TVP: Trichoderma viride Periyakualm; TVE: Trichoderma viride Erode; TVC: Trichoderma viride Coimbatore; THO: Trichoderma harzianum Ooty; THN: Trichoderma harzianum Nasiyanur
*Means of four replications. Values in each column followed by the same letter are not significantly different according to the DMRT method (P<0.05).
Table 1: Screening of Trichoderma isolates against Alternaria alternata in the dual culture test.