福建樟蚕的研究

<正>樟树是我国重要的珍贵用材和芳香油料树种,又由于树姿壮丽,冠层浓密、四季常青,而成为四旁绿化、庭园风景的优良树种。樟树广泛分布于我国南方11省区,天然资源丰富,福建省许多林场和香料厂自60年代起陆续营造了大面积的樟树人工林,樟树虫害日趋严重,其中樟蚕是一种重要害虫,它以幼虫吃叶,经常吃光全树,严重影响樟树的生长和发育,不仅直接影响樟树人工林的发展,还影响绿化效果和庭园美观。

STUDIES ON THE ERIOGYNA PYRETORUM COGNATA IN FUJIAN

Eriogyna pyretorum cognata Jordan is one of the worst pest of the camphor tree ( Cinnamomum camphora Nees. et Eberm. ) in Fujian Province This paper reports the results of the studies on the biological characteristics and control measures of ths froml983 to 1984. This insect has one generation each year and overwinters as a pupa. Adult moths begin to appear in late February and are most abundant in mid-March the next year. They lay their eggs on the branches. The egg stage lasted 18-32 days. Six to eight in stars were observed in the larval development which lasted 57-89 days. The cocoons adhered to the branches trunks of the camphor tree. The pupal stage lested 246-268 days. The adult moth stage lasted 2-14 days. The following two control measures are effective: (1) Spraying 80% DDPV emulsion or 50% Tamaron emulsion with a concentration 1: 500-2000 to kill the larvae; ( 2 ) Spraying nuclear polyhedrosis virus of pyretorum cognata suspension to kill the larvae.