| Sumario: | Sterile soil of Montenegro (Quindío, Colombia) was inoculated with the bacterium Ralstonia solanacearum Race 2, causal agent of Moko or banana bacterial wilt in plantain, under greenhouse conditions to evaluate the effect of alternative non-polluting products other than formol on the population of this bacterium. The following treatments were evaluated in a random complete block design, with five replications, and results were compared with those obtained with the formol 20% treatment (9.3 L/m2): incorporation of marigold (Tagetes patula) at 1 kg/m2; incorporation of calfos (0.5 kg/m2); Fulvan® liquid fertilizer (20 L/m2); and plantain compost lixiviate (2.7 L/m2). Non-treated inoculated and sterile soil was used as controls. The experimental unit consisted of two pots with 250 mL of soil. After treatment, the bacterial population was evaluated weekly over a period of 51 days. The population of the bacterium was reduced by 84,7 % by incorporating marigold as compared with 100 % with the application of formol; this difference, however, was non-significant (DMS ?=5 %). Reductions of 58.2 %, 50.8 %, and 31.6 % were also achieved with the application of Fulvan®, calfos, and lixiviate, respectively. Marigold and Fulvan® were the most effective treatments, 20 days after application, reducing the bacterial population 80 % and 90%, respectively. Because its low solubility, calfos took 20 days to act on the bacterium. Based on the results, it concludes that there are safe and efficient ecological alternatives to reduce the population of this pathogen in the soil.
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