前言日本因木材价格下跌、进口木材压力以及林业劳务恶化等原因,而使林业陷于极端困难阶段。应急对策之一是尽可能不投放过多人力就能成林,或者是育成可减少人力培育的优良品种。特别是最近由于气象害、病虫害等造成的森林被害有加剧趋势,所以抵抗性育种研究成为重要课题。 Foreword Japan is experiencing extremely difficult stages of forestry due to falling timber prices, pressure on timber imports and deteriorating forestry services. One of the emergency measures is to forestall as much as possible without putting too much manpower or to cultivate fine varieties that can reduce manpower cultivation. In recent years, due to the aggravating trend of forest damage caused by meteorological hazards, pests and diseases, the research on resistant breeding has become an important issue.