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- W2164949820 abstract "Currently, the world avocado industry relies almost solely on phosphorous acid to control Phytophthora cinnamomi root rot. Alternative chemicals must be sought to prevent any potential resistance from developing. The present study examined the use of liquid potassium silicate for activity against several types of phytopathogenic fungi. In-vitro dose-responses towards soluble potassium silicate (20.7% silicon dioxide) were determined for Phytophthora cinnamomi, P. capsici, Sclerotinia sclerotiorum, Sclerotium rolfsii, Pythium F-group, Mucor pusillus, Drechslera spp, Fusarium oxysporum, F. solani, Alternaria solani, Colletotrichum coccodes, Verticillium fungicola, Curvilaria lunata and Stemphylium herbarum. The standard agar amended method was used for these tests. Inhibition of mycelial growth was dose-dependant with 100% inhibition at 80 ml (pH 11.7) and 40 ml (pH 11.5) soluble silicon (20.7% silicon dioxide) per litre of agar, for all fungi tested in two experiments with the exception of Drechslera at 40 ml in one experiment. In addition, for the fi rst experiment, Colletotrichum coccodes, Mucor pusillus, Sclerotium rolfsii, Sclerotinia sclerotiorum and Phytophthora cinnamomi were completely inhibited at 5, 10 and 20 ml of soluble silicon per litre of agar. For the second experiment, Sclerotinia sclerotiorum and Phytophthora cinnamomi were completely inhibited at concentrations between 5 and 80 ml soluble silicon per litre of agar. For both experiments, Phytophthora capsici, Pythium F-group, Drechslera spp, Fusarium oxysporum, F. solani, Alternaria solani, Verticillium fungicola, Curvularia lunata and Stemphylium herbarum were partially inhibited at 5, 10 and 20 ml soluble silicon per litre of agar but percentage inhibition was positively correlated with dosage concentrations. Soluble silicon raised the pH of unameliorated agar from 5.6 to 10.3 and 11.7 at concentrations of 5 and 80 ml silicon per litre of agar respectively. Subsequent investigations into the effect of pH 10.3 and 11.7 in the absence of silicon, showed that Phytophthora cinnamomi was only partially inhibited (12.6%) at pH 10.3. Clearly, silicon had an inhibitory effect on fungal growth in vitro and this was mostly fungicidal. Pot and fi eld trials are necessary to confi rm effi cacy of silicon against plant pathogenic fungi in vivo." @default.
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- W2164949820 date "2005-01-01" @default.
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- W2164949820 title "In-vitro inhibition of mycelial growth of several phytopathogenic fungi, including Phytophthora cinnamomi by soluble silicon" @default.
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