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Bacteriocinogenic strelitzia strain (Str-10) of Pseudomonas solanacearum was tested for its ability to suppress development of bacterial wilt of tomato in a greenhouse. The spontaneous avirulent mutant of strain Str-10 i.e. strain Str-10 op type, significantly protected tomato plants from bacterial wilt. The strain suppressed the development of bacterial wilt incited either by bacteriocin-sensitive or bacteriocin-resistant strains. The protection was more pronounced when the temperature was low (18-25°C). However, at high temperature (30-37°C) the protection effect was lost. Population of strain Str-10 op type was maintained in the rhizosphere and rhizoplane. At 28 days after inoculation, population of strain Str-10 op type in the rhizoplane was 2×106cfu/g fresh weight of root and 2×105cfu/g dry weight of soil in the rhizosphere. The bacterium also invaded root and stem tissue a few centimeters above ground. The promising protection due to the strain Str-10 op type was obtained when the population ratio of the challenge strains to Str-10 op type was smaller than 1. Although the strain Str-10 op type exists in the greater amount in the root system, the bacteriocin was unlikely involved in suppression of bacterial wilt of tomato. The ability of strain Str-10 op type in suppressing the development of bacterial wilt was presumed to be derived from induced resistance of host plant.

Biological Control of Bacterial Wilt of Tomato by an Avirulent Strain of Pseudomonas solanacearum Isolated from Strelitzia reginae.