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一、前言柚木(Tectona grandis Linn.f.)原产东南亚,是著名的热带珍贵用材树种之一。我国热带、南亚热带地区已有多年引种栽培历史。广东省尖峰岭林业局大面积柚木已郁闭成林。柚木野螟(Pyrausta machaeralis Walker)属鳞翅目野螟亚科(Pyraustinae),在柚木原产地是柚木的一种主要食叶害虫。我国柚木引种地区业已普遍发现为害。据调查,尖峰岭林业局的柚木林植株被害率轻度达45.2％,中等至严重被害占28.6％。该虫发生量大、世代多、为害期长,虫口高峰期正值柚木生长季节,因此,严重影响植物光合作用,致使柚木生长减慢。关于柚木野螟在我国的研究资料,以前未见报导。鉴于柚木的优良特性及重要用途和造林面积的不断扩大,为能及时防治该虫为害,以利于为社会主义建设更多更快地提供优质木材,我们于1973—1976年在海南岛尖峰岭地区对该虫生物学特性及其防治进行了初步研究。
I. Introduction Teak (Tectona grandis Linn.f.) native to Southeast Asia, is one of the famous tropical timber species. China’s tropical and southern subtropical regions have many years of introduction and cultivation history. Jianfengling Forestry Bureau of Guangdong Province has a large area of teak closed forest. The family Pyrausta machaeralis Walker is a member of the family Pyraustinae and is the major leaf-eating pest of teak in teak origin. The introduction of teak in our country has generally been found to be harmful. According to the survey, Jianfengling Forestry Bureau teak plant damage rate of 45.2% mild, moderate to severe damage accounted for 28.6%. Occurrence of the worm large, multi-generation, long-term damage, pest population peak is positive teak growth season, therefore, seriously affect the photosynthesis of plants, resulting in slow growth of teak. Teak borer on the research data in China, no previously reported. In view of the excellent teak characteristics and important uses and afforestation area continues to expand, in order to timely control of the pest damage, in order to facilitate the construction of socialism to provide more and more high-quality timber, we in 1973-1976 in Jianfeng Island, Hainan Island The biological characteristics of the insect and its prevention and treatment of a preliminary study.