【摘要】 品穴星坑小蠹Pityogenes scitus Blandford是近几年在北京地区白皮松Pinus bungeana上发现的新害虫,大量发生可致白皮松死亡。作者通过对景山公园内危害白皮松的小蠹取样调查,明确其种名为品穴星坑小蠹,纠正以前的错误报道;通过生物学特性观察,发现该小蠹在北京地区1 a发生2代,以成虫和幼虫越冬,越冬成虫和幼虫的比例为1∶0.6;成虫年发生高峰有2次,分别在5月和7月;该小蠹有一雄多雌现象;坑道蛀在韧皮部,稍嵌在边材上,多侵入生长势弱的白皮松,从而加剧树势的衰弱。防治应以增强树势为主,其他措施为辅。更多还原

【Abstract】 The bark beetle Pityogenes scitus Blandford was found on the lacebark pine,Pinus bungeana,in Beijing area recent years. Heavy infestation of the pest causes the whole pine to death. We investigated the bark beetle on the lacebark pine in Beijing Jingshan Park. We confirmed that it is Pityogenes scitus,previously identified as Pityogenes chalcographus. Through the study on the biological characteristics of P. scitus,we found that it occurred two times a year,with overwintered as adults and larvae( ratio = 1∶ 0. 6). The adults’ occurrence peaked in May and July. It had polygynous phenomenon,with male boring tunnels in the phloem,slightly embedded in the sapwood. It can easily penetrate the tree in weak growth conditions,further exanerbating the tree’s vigor. The control methods should be focused on enhancing trees’ vigor and supplemented by other measures such as using the chemicals to kill adults or prevent their enterence.更多还原