杉木种子园不同无性系和不同着生方位球果对病虫害的抗性

On insect and disease resistance of cones in different Chinese fir clones

１９９３～１９９５年在浙江省新安江开发公司姥山林场杉木种子园检测了１４个无性系，７６２株标准株，５０４０个球果。结果表明，引起球果死亡的主要病害是杉木雌雄花序幼果枯萎病、杉木球果赤枯病和杉木球果炭疽病。球果害虫主要是杉木球果瘿蚊、杉木球果麦蛾和杉木扁长蝽等。不同无性系球果对病虫害的抗性有极显著的差异，并筛选出龙泉２０和开化０为抗性无性系，确定临安１３１为敏感无性系以及其他推荐和建议淘汰的无性系。着生于北面的球果死亡率极显著高于东、南、西３个方位。

The Chinese fir cones were mainly harmed by three diseases,i e Botrytis cinerea,Pesealotiopsis apiculatus and Giomerella cingulata,and three pests,i e galls in Chinese fir cones,Dichomeris sp and Sinorsillus piliferus There were obvious variances between the resistances of the cones in different clones Two clones,Longquan 20 and Kaihua 0,could resist the damage of diseases and pests,and Lin′an 131 was sensitive to diseases and pests Mortality rate of cones at the north of crowns was obviously higher than that at the other directions