黔东地区萧氏松茎象危害情况调查

目的]找出萧氏松茎象在玉屏县未造成危害的原因。方法]以人工采脂松树为对照,从蛀道的横向长度和流脂量研究萧氏松茎象危害松树的情况。结果]萧氏松茎象割面负荷率远远小于标准0.4的规定,所形成的蛀道不足以危害松树。有萧氏松茎象的松树平均单株年流脂量40.95g,每厘米胸径流脂量2.95g,采脂树平均单株年流脂量1500.00g,每厘米胸径流脂量79.74g,表明萧氏松茎象造成松树流脂仅有人工采脂的数十分之一。有萧氏松茎象的松树与周围松树的生长状况、树高与胸径没有明显差异。从古到今玉屏县从未发现萧氏松茎象致死松树的现象。结论]流脂量和蛀道的横向长度都不足以对马尾松造成实质损害,是萧氏松茎象在玉屏县危害不严重的主要原因。

Primary Study on the Damage Status of Hylobitelus xiaoi Zhang in Eastern Guizhou Area

Objective The study aimed to find the reason of Hylobitelus xiaoi Zhang causing no harm in Yuping County.Method With manual resin-tapping pine as CK,the harmful status of H.xiaoi against pine was studied from the transverse length and resinosis amount of its eating path.Result The load rate of the dipping area of H.xiaoi was far less than the ruled standard of 40 %,the formed eating path was deficient to harm pine.The average annual resinosis amount per pine with H.xiaoi was 40.95 g and that of resin-tapping pine was 1 500.00 g.The resinosis amount per centimeter of stem diameter per pine with H.xiaoi was 2.95 g and that of resin-tapping pine was 79.74 g,showing that the resinosis amount of pine caused by H.xiaoi was only 1/10 of manual tapping resin.The pine with H.xiaoi had no obvious difference from the growth status of pines around,the tree height and stem diameter.The pine died from H.xiaoi had never happened in Yuping County from the ancient to now.Conclusion Both the resinosis amount and the transverse length of eating path are deficient to make essential harm on masson pine.It is the main reason of H.xiaoi causing no serious harm in Yuping County.