Endoclyta signifer Walker is a new wood borer on eucalyptus recorded in Guangxi Zhuang Autonomous Region and Guangdong province in recent years. In this paper, the morphology, biology and distribution of E. sig-nifer were studied. In Guangxi Zhuang Autonomous Region, E. signifer distributes in 232 towns of 49 counties, 12 districts, and its distribution area is 2 894.42 hectares. Most of the individuals take one year to complete a generation, and over-winter with larvae in host stem from mid-December, the pupa occur in March of next year, emergence in April, the 1st instars larvae appear in May, and the larvae begin to transfer boring into host tree in June or July. Only one emergence happens in a year. It distributes mainly in the mountain area, valleys or gully, 1-2 year-old hybrid eucalyptus, Eucaluptus grandis X E. urophylla and E. urophylla x E. grandis are usually damaged seriously. The ratio of timber volume decline in 1-and 2-year-old damaged eucalyptus plantation were 16.70% and 24. 78% , respectively. In valleys and gully area, 1-2 year-old hybrid eucalyptus plantation are the prevention area and the control object.%桉蝙蛾是近年来在广西、广东新发现严重危害桉树的蛀干害虫,本文记述了该害虫的形态特征和生物学特性,该虫在广西分布于12个市49个县,10个自治区直属国有林场,232个乡镇,危害桉树面积达2 894.42 hm2,多数个体1年完成1代,以幼虫于12月中下旬开始在受害树干中越冬,次年2-3月化蛹,4月羽化,5月上旬初孵幼虫出现,6-8月幼虫上树转移危害,1年只有1次羽化；该虫主要分布在丘陵山地,以沟谷和坡底危害较严重,主要危害1～2年生巨尾桉和尾巨桉无性系.1年生和2年生受害桉树单株材积生长量下降率分别为16.70％和24.78％.沟谷和坡底1～2年生速生桉无性系是防治的主要对象.
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