萧氏松茎象不同寄主的为害部位调查初报

萧氏松茎象(Hylobitelus xiaoi Zhang)是危害松科植物的重要钻蛀性林业有害生物,对不同的寄主其为害部位不同,造成的损失也不相同。通过实地观察和调查统计分析发现,萧氏松茎象在绥阳县为害湿地松蛀道在松树树干基部4.6 cm的左右位置,连续为害蛀道高度可达41 cm,为害华山松蛀道在树干基部以下2~5 cm,危害马尾松蛀道在基部0.2 cm左右的位置。3种不同的寄主受害后损失也不相同,湿地松受害损失最大,死亡率达到15%以上;对华山松的死亡率达到5%以上;危害马尾松后很少造成死亡,损失最小。

Study on the Damage Characteristics of Hylobitelus xiaoi Zhang on Different Host Plants

Hylobitelus xiaoiZhang is an important new boring pest on Pinaceae plants,and has different damage characteristics and different losses on different host plants.According to the field investigation and statistical analysis,tunnelling location of the pest was at an average of 4.6cm above ground on Pinus elliottii Engelmann,and at 2~5 cm above ground on Pinus armandii Franch,and at 0.2cm above ground on Pinus massoniana Lamb.As to the damage resulted from the feeding of the pest,highest loss was found on Pinus elliottii Engelmann with a mortality rate up to 15%,and medium loss was found on Pinus armandii Franch with a mortality rate up to 5%,while the lowest loss was found on Pinus massoniana Lamb.was lowest with seldom death of the trees.