黑翅土白蚁在金秋梨上的发生危害调查初报

金秋梨是南方主栽优良晚熟梨品种，在对其病虫害种类调查中首次发现黑翅土白蚁危害十分严重。采用抽行式的调查方法，对该虫在梨山分布危害情况进行了系统调查分析，摸清里了该虫在梨山发生危害特点和蔓延趋势。该虫危害金秋梨树有一定的选择性，树干光滑，裂缝细小没有被害，树干粗糙，裂缝多且深的被害严重，梨树被害率从2005年的0.91%上升到2009年的41.39%，呈指数增长态势。该虫由老蚁巢向四周漫延扩散趋势。缓坡地带比陡坡地带发生严重。危害时期是每年的4月到11月。

A Preliminary reporter on the occurrence and harmfulness of Odontotermes formosanus in jinqiu pear

Jinqiu pear is a fine late-maturing variety in the south of china. Serious Harmfulness of Odontotermes formosanus in Jinqiu pear was first found in its survey of pest species. The distribution and harmfulness of this insect in the pear garden was investigated systematically by drawing-lined method. The characteristics of its occurrence and harmfulness and spreading trends were ascertained. This insect has a certain selectivity. The trunk of the tree is smooth and small cracks on it was no damaged and the trunk rough and deep cracks on it was more serious damaged. The rate of damage of pear trees went up from 0.91% in 2005 to 41.39% in 2009, which shows index growth. The insects spread to the surrounding by the old nest. Trees in the gentle slope is more serious than that in the steep slopes. Damage period is from annual April to November.