咸安区地处鄂南，为山区丘陵地带。近几年来，由于持续暖冬，马尾松毛虫越冬基数高，今年入夏以来，长期晴雨相间，气温高，湿度大，光照充足，极有利马尾松毛虫的发生，加上地形对其发生有利，致使马尾松毛虫１９９９年大暴发。由于其成虫趋光性强，迁飞扩散性大，导致城... Haman District is located in southern Hubei, a mountainous area. In recent years, due to continuous warm winter, the Dendrolimus punctatus high base of winter, since the beginning of summer this year, long-term barren, high temperature, humidity, adequate light, very favorable for the occurrence of Dendrolimus punctatus, coupled with its favorable terrain, resulting Masson Pine Caterpillar outbreak in 1999. Because of its strong adult photophobia, migration and diffusion of large, leading to the city ...