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Abstract: Bacterial brown blotch (Tolaas 1915) caused by Pseudomonas tolaasii (Paine, 1919), is considered as the most common and serious bacterial disease on cultivated mushrooms throughout the world. The appearance of brown spots and sunken lesions on the mushroom caps is responsible for poor crop quality and results in loss of economic value. Losses from at least 10 percent, due to Pseudomonas tolaasii infection, occurred in Belgium. This paper proposes a procedure for the correct identification of Pseudomonas tolaasii. These findings can be considered as one of the essential conclusions from an extensive phenotypic and genotypic study, which was carried out in our laboratory (Goor et al., 1986). Since there is a need of valuable pesticides for the control of bacterial brown blotch, we screened the bactericidal activity of several chemical compounds against pathogenic pseudomonads from cultivated mushrooms. One hundred and two chemicals were tested in vitro, including 23 antibiotics. The majority of the chemicals were food additives harmless to human health. Active selected chemicals were further tested against P. tolaasii in mushroom nursery conditions.
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