Volume 11 Part 2 Article 25: Control of Bacterial Blotch on Mushroom with Bactericides

Volume 11 Part 2 Article 25
Year 1981
Title: Control of Bacterial Blotch on Mushroom with Bactericides
Authors: C.C. Tu and Y.M. Liao


Bacterial blotch (Pseudomonas tolaasi) is one of the most prelavent diseases of mushroom (Agaricus bisporus) in Taiwan. Brown and slightly concaved spots appear on the surface of diseased fruit bodies (Tolass, 1915; Paine, 1919), resulting in the loss of commercial value of mushroom (Hu et al., 1954; Dough, 1975). The disease occurs at a temperature ranging from 8 to 18°C (Hsu and Chen, 1974; Sinden, 1971) and becomes especially severe when a higher moisture condition is supplied. For the control of the disease, various chemicals such as hypochloride, hexachlorophane and some halgon compounds with bromide or chlorine have been used (Gandy, 1966, 1958). Stoller (1978) reported that application of terramycin at the rate of 9 mg/sq.ft mushroom bed was effective in controlling the disease and was harmless to human health. But Fletcher (1978). emphasized that the application of terramycin was apt to induce resistant isolates of the pathogens. The antibiotics have been used for controlling bacterial blotch since 1975 in Taiwan. It was reported that 55% control of the disease was obtained with 2 applications, one before fruiting and the other 2 weeks later, of 200 ppm streptomycin or 100 ppm oxytetracycline at the rate of 300 ml/sq.m (Dough, 1976). However, no other information on,these two antibiotics was available at that time.

The purpose of this study was to confirm the efficacy of, these antibiotics for the control of the disease and also to obtain further information needed for the practical use of these antibiotics.

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