马尾松林油松球果小卷蛾发生及防治

油松球果小卷蛾钻蛀马尾松雌球花，２年生球果和嫩梢。该虫在浙江省一年发生１代，以蛹在土内越冬。本文报道了成虫的羽化规律，幼虫钻蛀及转移习性。该虫各虫态发生期与松实小卷蛾，芽梢斑螟等钻蛀性害虫发生的相关性；马尾松林中油松球果小卷蛾与松实小卷蛾的种群比率。通过试验，提出马尾松种子园４月中旬喷洒２０％杀灭菊酯乳油１５００倍液，防治效果达９０％以上。

Studies on the Occurrence and Control of Gravitdrmata margarotana Heinemann

Gravitarmata margarotana Heinemann is one of the most important insect pests damaging shoots and cones of Pinus massoniana in China. The studies on its bioecology and control were carried out in Yuhang and Kaihua Counties, Zhejiang Province in 1985-1992. G.margarotana has one generation a year. Pupae overwinter in the soil. The habits of adult emergence and larval damage were observed.The relationship of insect occurrence to tree height, crown diameter, crown position and periodic biological phe-nomena are also narrated. Chemical pesticides could be used to control, the insect in masson pine seed orchard. The results showed that the spraying of 20% F'envalerate in mid-April is effective.