Efficiency of Trichoderma spp. for induction of foliar disease resistance in tomato (Thai)
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Abstract
The efficiency of 4 isolates of Trichoderma spp. isolated from cultivated soil of the northeastern region, T9 (T. harzianum), T13 (T. asperellum), T17 (T. asperellum) and T18 (T. asperellum) on the folia disease resistance induction in tomato was studied. The fungi was cultivated on sterilized sorghum grains and mixed in soil (2 % w/w). Tomato plants were transplanted into pots for two weeks, and then inoculated with folia disease pathogens, Xanthomonas campestris pv. vesicatoria (XCV), Stemphylium solani and Corynespora cassiicola. The number of leaf spot symptoms for each pathogen was evaluated. The results show that isolate T9 (T. harzianum) reduced bacterial spot numbers the most at 69.32 %. The T13, T17 and T18 expressed spot reduction in descending order. For Stemphylium leaf spot, the isolate T18 reduced leaf spot of 19.23 % more than isolate T9. However, T13 and T17 did not reduce spot numbers (P>0.01). The isolate T18 exhibited target spot reduction of 11.00 %. Isolates T9 and T13 followed and T17 was not able to induce target spot resistance in tomato. This present study suggests the induction of folia diseases of tomato by using the antagonistic fungus, Trichoderma spp.
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