A 10-fold-diluted suspension of a fertilizer paste (product name: TP, Taki Chemical, Hyogo) was tested for suppression of violet root rot of apple caused by
Helicobasidium mompa in infested kuroboku soil (soil texture: L), gray lowland soil (SL, LiC) and brown forest soil (HC, SL). In pot experiments with infested soils, disease severity on apple rootstocks (
Malus prunifolia var.
ringo) in all soils treated with TP was lower than on those treated with tap water. These results suggested that a fertilizer paste applied to the soil surface around the trunk bases of apple trees will suppress disease in most apple orchards.
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