油松球果害虫的危害机理研究

Research on the damage mechanism of the cone insect pests of Chinese Pine in Shaanxi,China

对油松球果生命表的研究表明 ,油松球果小卷蛾和松果梢斑螟是两种主要的油松球果害虫 ,其发生危害主要集中在 5 ,6两月。根据油松生殖生长的特点 ,对两种球果害虫随树龄变化规律的研究结果表明 ,随着树龄的增加 ,油松结实量增加 ,雄花序增多 ,但由于松果梢斑螟的发生和危害与雄花序的多少直接相关 ,松果梢斑螟的虫量增大 ,危害加重 ;在同一林龄中 ,有少雄、中雄和多雄树之别 ,松果梢斑螟的虫量随之变化 ;每果内松果梢斑螟的幼虫数随树龄和雄梢率的增加而增加 。

The research results of the cone life table of chinese pine show that Gravitarmata margarotana Heinemann and Dioryctria pryeri Ragonot are two kinds of main cone pests which occur and damage from mid May to mid June in Shaanxi.The paper deals with the varying law of two cone pests with tree age according to the reproduction characteristics of chinses pine,the results show that the reproductive growth and male inflorescences increase with the tree age increasing.Because of direct correlation between the occurrence and damage of Dioryctria pryeri Ragonot and amount of male inflorescences in chinses pine,the population of Dioryctria pryeri and its damage on chinese pine increase seriously with tree age.And the population of Dioryctria pryeri varies with the amount of inflorescences types little male,middle male and more male inflorescence,of chinese pine.The larvae number of Dioryctria pryeri per cone damaged has positive correlation to the tree age and male inflorescence ratio.However,the population of Gravitarmata margarotana Heinemann decreases with tree age increasing.