For inspection of Helicobasidium mompa, causing violet root rot disease of mulberry in soil, the authors used two methods in this experiment.One method is that five dead mulberry branches, about 1.5-2.0 cm in diameter and 30 cm in length, bundled up as a wattle, had been buried 15-20 cm deep in the soil of every forest near the three mulberry fields, and were examined for inspecting the fungus strands or mycelial mats spreading over branches after three months. The other is that the root and basal portion of trees in the forests were examined for the same purpose.
By these methods the fungus could be trapped in each forest near the two fields, infested with violet root rot fungus, and could not in the forest near the healthy field. This fact shows that these two methods aiming early detection of violet root rot fungus in soil may be practically effective for determination whether a forest will be suitable for planting of mulberry trees or not. And it may be said that the latter method will make the inspection of the fungus easier than the former.