Wood-decay fungi, Pleurotus ostreatus, Lentinula edodes, Neolentinus lepideus, Trichaptum abietinum and Cryptoporus volvatus, were tested for their ability to affect the pinewood nematode population in wood by inoculation experiments. Logs of 1m long and branches of 30cm long, cut from healthy pine trees, were inoculated with P. ostreatus and the pinewood nematode. After inoculation, increases in nematode population in wood were compared with those in logs and branches which were inoculated with nematodes alone. Population in wood inoculated with the fungus was significantly less than that in wood without fungus inoculation. Throughout inoculation experiments of other wooddecay fungi, it was demonstrated that L. edodes, N lepideus and T abietinum also showed their ability to control nematode population in wood. C. volvatus were not recognized for their ability to control the nematode population in wood. Inoculation of P. ostreatus and L. edodes to branches cut from dead pine trees killed by the pinewood nematode did not cause decrease in nematode population in dead wood. Fungi might be unable to grow in dead wood because of lack of food resources, such as parenchyma cells which had been destroyed by the pinewood nematode. Jpn. J. Nematol. 35 (2), 63-70 (2005).

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Inoculation test was conducted to confirm the influence of Pratylenchus penetrans on the infection of adzuki bean by Phialophora gregata f. sp. adzukicola, causal agent of brown stem rot of adzuki bean, in the green house. It was considered that high densities of P. penetrans enhanced the invasion of P. gregata f. sp. adzukicola to adzuki bean and the ratio of the highest brownish node to total nodes of adzuki bean. From the result, P. penetrans was clarified as one factor which enhanced the invasion of P gregata f. sp. adzukicola to adzuki bean. Jpn. J. Nematol. 35 (2), 71-77 (2005).

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Seasonal occurrence of P. penetrans, H.glycines and P gregata f.sp. adzukicola, causal agent of brown stem rot of adzuki bean (BSR), and the damage of adzuki bean as postcrop was determined in a field in Shihoro, Hokkaido where several green manure crops were cultivated in the previous year. The results obtained from the plot planted with wild oats showed that population densities of P. penetrans and P. gregata f.sp. adzukicola in soil remained low, and infection and damage degree of post-crop adzuki bean by BSR was so low that a high yield was obtained. By contrast, in the sweet corn plot, the density of P. penetrans was very high and P. gregata f.sp adzukicola was somewhat high, and the damage of adzuki bean by BSR was so severe that a low yield was obtained. The densities of H glycines was decreased to zero at all green manure crops except adzuki bean. Jpn. J. Nematol. 35(2), 79-86 (2005).

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