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一字竹象(Otidognathus davidisF.)在江苏主要为害桂竹,故名桂竹象.幼虫蛀食笋秆,成虫补充营养取食笋肉,致使95%以上的桂竹被害、断头烂梢,竹材僵硬多孔,人称“烂头桂”,严重影响生长,降低使用价值.此虫在江苏一年发生一代.以成虫在地下8—20厘米的土室中越冬,次年5月下旬桂竹出笋时,成虫出上(成虫有假死习性和较强的飞翔能力,24小时累计飞行距离523—613米),经补充营养、交尾后产卵于高121.55±43.95厘米的笋内.幼虫共5龄,3龄后食量增大,被害部位逐渐扩大,竹梢多沿受害部折断.幼虫在笋中历朝5—13天,由于发生期不整齐.为害期可延续一个半月.
The word ichthyopsis (Otidognathus davidisF.) Is the main damage in Jiangsu, Guizhu, hence the name of the lavender as bamboo shoots, larvae eating bamboo shoots, adult nutrition feeding bamboo shoots, resulting in more than 95% of the victims of bamboo, broken rotten, bamboo Stiff and porous, known as “rotten Gui,” seriously affecting the growth and reduce the value of use of this worm occurs in Jiangsu a year generation to adults in the ground 8-20 cm soil overwintering in the following year in late May when bamboo shoots , The adult out (adult parachute habit and strong ability to fly, 24 hours total flight distance 523-613 meters), after nutritional supplementation, after mating spawning in shoots 121.55 ± 43.95 cm high larvae total of 5 years, After 3 years of age, the appetite increases and the damaged part gradually expands, and the bamboo shoots break along the affected part, and the larvae die during the period of 5-13 days in the bamboo shoots.