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Influence of mutant contamination on biocontrol efficacy of CHA0 inoculants. Cucumber seeds were treated with suspensions of wild-type CHA0 inoculum contaminated by adding a gacS (CHAS17) or gacA (CHAS33) mutant at a range of concentrations from 0 to 100%. Seeds were grown in soil infested with P. ultimum. The percentages of seedlings that emerged and were standing after 10 days are shown. The values are means based on six replicates; the error bars indicate standard errors.
