Effect of biocontrol agents on wilt management and plant growth of tomato.

摘要

The efficacy of Trichoderma viride, T. harzianum and Pseudomonas fluorescens, singly or in combination, against Fusarium oxysporum f.sp. lycopersici was evaluated in vitro by soil plate technique. The radial growth of the pathogen was significantly inhibited by the antagonists. T. harzianum was the most effective, inhibiting the growth of the pathogen by 76.83 and 77.30% at 4 and 8 days after inoculation, respectively. In a greenhouse experiment conducted for 2 years, tomato seedlings were inoculated with the pathogen and antagonists, and wilt incidence was evaluated at 30 days after transplanting of the seedlings into pots. The biological control agents reduced the incidence of tomato wilt and enhanced the growth of tomato in both years. T. harzianum resulted in the lowest wilt incidence (5.6% on the first year and 6.0% on the second year, which were lower by 86.6 and 85.9%, respectively, compared to the untreated control), and greatest root length (13.50 and 13.80 cm) and shoot length (4.184.2 and 4.0 cm).