Effect of Wild Oats and Sugar Beet Cultivar Cultivation on the Population of Polymyxa betae as a Fungal Vector of Rhizomania Disease of Sugar Beets in Infested Soil

概要

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The objective of this study is to evaluate the effect on change in the population of Polymyxa betae, a BNYVV vector, by the cultivation of wild oats and resistant and susceptible sugar beet cultivars. The viruliferous population of P. betae in infested soil cultivated for 9 months by wild oats was 0.18 infection units per gram (IU), 0.43 IU in resistant and 5.22 IU in susceptible sugar beet cultivars, and 0.36 IU where no plants were cultivated. IU was significantly reduced by wild oat cultivation and increased by susceptible sugar beet cultivar cultivation compared to no planting. IU after resistant cultivar cultivation was the same as no planting. The number of P. betae sporesori using direct observation microscopy from infested soil cultivated with sugar beet cultivar were 3 times as great as wild oats and no planting. The rate of empty resting spores treated with root exudates of wild oats and sugar beet for 21 and 37 days was higher than in distilled water treatment.
北日本病害虫研究会の論文