切梢小蠹蛀食云南松枝梢行为研究

横坑切梢小蠹(Tomicus minor)和云南切梢小蠹(Tomicus yunnanensis)是两种重要的松属(Pinus)蛀干害虫,通过蛀梢危害与蛀干危害共同致死云南松(Pinus yunnanensis)。通过林间自然调查,对横坑切梢小蠹和云南切梢小蠹蛀食枝梢影响因素进行了探讨。结果表明,蛀梢坑道长度与枝梢长度和蛀梢直径呈显著相关,且切梢小蠹侵入枝梢的部位也很大程度上决定了蛀梢坑道的长度,二者显著相关。研究发现,影响横坑切梢小蠹蛀梢坑道长度的主要因素为侵入孔位置,而影响云南切梢小蠹的主要因素为枝梢长度,枝梢直径,侵入孔位置。

Shoot Feeding by Tomicus (Coleoptera: Scolytinae) on Pinus yunnanensis Trees

Tomicus minor and Tomicus yunnanensis are two important pine shoot beetles on Yunnan pine(Pinus yunnanensis Franchet) in Yunnan Province.Shoot feeding and trunk attack are two factors of tree death.The current studies were conducted under field conditions that the beetles were allowed to attack the shoots.Factors influencing shoot feeding by T.minor and T.yunnanensis were discussed.Result shows that there is a remarkable relationship between gallery length and shoot length,and this correlation is also noticeable between gallery length and shoot diameter.Positions of invading holes on the shoots(lower,middle,or upper) attacked by Tomicus determine the gallery length to a great extent,and there is a significant relationship between them.The main influence factors on shoot feeding by T.minor are positions of invading holes,while those on shoot feeding by T.yunnanensis are shoot length,shoot diameter and positions of invading holes.