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Abstract: Chlorine dioxide, a vigorously oxidizing agent now available in a stabilized formulation, was examined and compared with sodium hypochlorite solutions in controlling bacterial blotch of mushrooms, caused by Pseudomonas tolaasii. An artificial infection of the casing soil with P. tolaasii, resulted in control yields of which 86-93% was severely affected by brown blotch. Successive treatments with activated chlorine dioxide solutions (50 ppm), applicated 3 days before the first flush and at watering in between flushes, reduced blotch incidence significantly to only 15-27% of the yield. Moreover, these mushrooms were only lightly affected. Standard sodium hypochlorite solutions of 125 and 250 ppm active chlorine were only capable of reducing the blotch-affected mushrooms to only 55% of the yield.
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