Soil type, phosphate application, and soil pH all influence the incidence of black root rot caused by Phomopsis sclerotioides

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  • ホモプシス根腐病の発病に及ぼす土壌の種類,施肥リン酸,土壌pHの影響
  • ホモプシス ネグサレビョウ ノ ハツビョウ ニ オヨボス ドジョウ ノ シュルイ,セヒ リンサン,ドジョウ pH ノ エイキョウ

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Abstract

We examined the effects of soil type, soil pH, and the concentration of available phosphate on the growth of Phomopsis sclerotioides hyphae and the incidence of Phomopsis diseases. Autoclaved samples of humic Andosol, non-humic Andosol, Brown Lowland soil, Gray Lowland soil, and Red-Yellow soil were inoculated with the pathogen, and the extent of disease suppression by each soil was evaluated. The humic Andosol most strongly suppressed the incidence of disease; it also suppressed P. sclerotioides hyphal growth on soil agar medium supplemented with it. The addition of excess phosphate reduced these suppressive effects. As the addition of phosphate decreased the amount of soluble aluminum in the humic Andosol, active aluminum may be responsible for the suppressive effects of the soil. We also examined the effects of increasing the soil pH from 5.5 to 7.5 on hyphal growth and the incidence of disease: both were greater at low pH and were suppressed at pH 6.5 or higher. Thus, although humic Andosol can suppress Phomopsis, excessive application of phosphate and soil alkalinification both reduce its capacity to suppress pathogen growth and increase the incidence of disease.

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