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林业科学 ›› 1995, Vol. 31 ›› Issue (1): 81-85.

• 研究简报 • 上一篇    下一篇

大青叶蝉防治指标的研究

王爱静1,王成祥1,李中焕2   

  1. 1. 新疆林业科学研究院, 乌鲁木齐 830063
    2. 新疆阿克苏地区林业处森防站, 阿克苏 843000
  • 收稿日期:1993-11-29 出版日期:1995-01-25 发布日期:1995-01-25

ON CONTROL INDEX OF TETTIGONIELLA VIRIDIS(LENNAEUS)

Aijing Wang1,Chengxiang Wang1,Zhonghuan Li2   

  1. 1. Porest Protection Group of Xinjiang Institute of Forestry Sciences Urumqi 830063
    2. Forest Protection Station of Aksu Djqu Prefecture Aksu 843000
  • Received:1993-11-29 Online:1995-01-25 Published:1995-01-25

关键词: 大青叶蝉, 新疆杨, 防治指标

Abstract:

Tettigoniella viridis (Lennaeus) damages trees principally by ovipositing activities.When saplings or young trees of Populys alba var. pyramidalis (Bunge) are infested, the thinner bark becomes rough, and its colour turns yellow, growth of the saplings slows down, leaves fall earlier while sprouting delays, What is more that the scars caused during oviposition on the bark multiply saplings'water losses, greatly decrease water content of the stemsand branches, and make tops of the young trees wither easily, Number of the oviposition scars on the stems of one-year saplings of Populus alba var.Pyramidalis (Bunge) distinctively correlates to the latio of water decrement.The regressive equation is y=8.5001+0.1809x. Its coefficient of interrelation is 0.9482, which is extremely significant.The younger saplings are, the more serious damage is.It is worked out through three years' experiment that ec onomic injury level(EIL) of Tettigoniella viridis(Lennaeus) to one-year poplar trees is 19.54 egg lumps/0 -50cm, to two-year trees is 24.98 egg lumps/0 -50cm. Control index of adult pests for the former is 10.7 heads per sapling, for the latter is 13.7 heads per sapling. Tettigoniella viridis(Lennaeus) is less harmful to trees older than three years since they possess more branches and their stem bark becomes lignified.

Key words: Tettigoniella viridis L., Populus bolledna Lauche, Control index