果梢斑螟对马尾松球果和雄花序枝生长发育的影响

果梢斑螟Dioryctria pryeri Ragonot是我国马尾松雄花、球果和枝梢的重要钻蛀性害虫。幼虫钻蛀主梢,引起枯萎,树干弯曲,影响高生长和材质;钻蛀雄花枝,引起雄花枯萎,影响雌花受粉,雄花枝遭蛀大量折断后,枝基当年萌芽,形成众多的细枝,钻蛀球果,引起萎蔫、落果,造成马尾松种子园种子产量严重歉收。果梢斑螟在浙江省一年一代,以幼虫越冬。翌年3月上旬至5月中旬,是马尾松雄花含苞、开放和二年生球果逐渐膨大时期,果梢斑螟越冬幼虫随即蛀入雄花序枝和球果,但有关该虫对马尾松球果、雄花序枝生长发育的影响迄今未见报道。本文旨在探索果梢斑螟危害对马尾松增枝、枝的生长量等的关系,为确定该虫的防治指标的研究提供参考依据。

INFLUENCE ON THE DEVELOPMENT OF CONES AND STAMINATE BRANCHES OF PINUS MASSONIANA BY DIORYCTRIA PRYERI RAGONOT

Dioryctria pryeri Ragonot is a serious pest that damaged cones and staminate branches of Pinus massoniana in China. The observation of binomics of this insect pest was carried out in Chunan County, Zhejiang Province in 1986-1988.The larvae bore into the cones of Pinus massoniana. The damaged rate is 10.8% in the pine forest in Chunan County. The damaged cones wilt and turn brown and then drop doun by late-fall.The larvae also attack staminate branches. The branches are killed as a result of larval boring. The data obtained were studied by regression analysis. The relationships between the damaged rate of staminate branch(X) and the difference of annual increasing branch rate(Y1), length of health-branch(Y2) were estimated respectively as follows: Y1=77.16 + 2.80X, Y2= 7.63 -8.22 X.The paper is helpful to study of control index of D. pryeri Ragonot.