日本落叶松伐期短,是造林的适用树种。近十年来造林面积急剧增加,现已将近70万公顷,而且今后每年仍要栽植5—6万公顷。这些落叶松林有80%在北海道、东北及关东北部地区。但是近两三年来,在日本落叶松造林最盛的北海道及东北各地的造林地上很快地发生了日本落叶松枯梢病。这些地区内有50万公 Japan larch cut short, is suitable for afforestation species. The area of ​​afforestation in recent ten years has risen sharply, and now it has nearly 700,000 hectares. In the future, 50,000 to 600,000 hectares are still to be planted every year. Eighty percent of these larch forests are in Hokkaido, northeast and northern Kanto. However, in the recent two to three years, Japan’s Larix kaempferi blight occurred very rapidly on afforestation land in Hokkaido, where afforestation is most abundant in Japan and northeastern China. There are 500,000 males in these areas