Abstract
The effect of seed dressing with the antagonist Streptomyces griseoviridis on root rots and yields of wheat and barley was studied in field experiments. In long-term field experiments, where different levels of soil-borne inoculum of root rots were maintained with different crop sequences, seed treatment with the antagonist increased yields slightly on average over all experimental years. However, variations between years, crops and crop sequences were considerable. The highest yield increases were in excess of 600 kg/ha, whilst treatment occasionally resulted in slight yield losses. In experiments in which seed naturally infested with Fusarium spp. was used, seed treatment with S. griseoviridis increased yields of wheat but not those of barley. Seed dressing with an organomercurial fungicide resulted in higher yield increases than the biopreparate.
Highlights
Yield losses caused by common root rot may exceed up to 10% (Uoti 1976, Kurppa 1985).The damage is most severe in cereal monoculture
This study investigates the efficacy of S. griseoviridis seed dressing on barley and spring wheat against foot rot diseases in field conditions and its effect on spring wheat and barley yields
The performance of the antagonist Streptomyces griseoviridis in the field was studied in two crop-rotation experiments, with rotations maintaining different levels of soil-borne inoculum of root-rot pathogens, Fusarium spp., Gaeumannomyces graminis and B. sorokiniana
Summary
The effect of seed dressing with the antagonist Streptomyces griseoviridis on root rots and yields of wheat and barley was studied in field experiments. In long-term field experiments, where different levels of soil-borne inoculum of root rots were maintained with different crop sequences, seed treatment with the antagonist increased yields slightly on average over all experimental years. Numerous soil-inhabiting micro-organisms, e.g. Tahvonen R. el ai: Effect of seed dressing treatment ofstreptomyces griseoviridis. Preliminary studies of Tahvonen and Avikainen (1990) indicated that the antagonist has potential for controlling common root, Fusarium spp. and B. sorokiniana, of cereals. This study investigates the efficacy of S. griseoviridis seed dressing on barley and spring wheat against foot rot diseases in field conditions and its effect on spring wheat and barley yields
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