Host: The Japanese Forestry Society
Population dynamics of the pine wood nematode were investigated throughinoculation tests to pine logs. The pine wood nematode was inoculated to pine logs prepared from pine trees just after felling. Other treatments were established as follows; inoculations were made to pine logs from pine trees felled 1month before, 2 months before, 3months before, respectively. The nematode population increased in log wood after inoculation. Nematode reproduction was rapid and a large population developed in the wood. Populations reached a maximum level on 1 month after inoculation and then decreased gradually. Although a trend of population dynamics was almost similar among treatments, populations in log wood of treatments other than the treatment in which nematode inoculation was made just after tree felling were fewer than those of the latter treatment. In log wood from pine trees felled 3 months before, no population growth was observed. These results suggested that the pine wood nematode might feed on living wood tissues, such as parenchyma sells, and reproduce vigolously in wood. After deterioration in the quality of wood tissues, nematode reproductiondeclines. Inoculation of oyster mushroom and shiitake mushroom to pine logs were made 1 month after inoculation of the pine wood nematode. In pine logs inoculated with oyster mushroom, nematode population was significantly controlled. This result might indicate that microorganisms might affect on population dunamics of the pine wood nematode in pine wood.
