林业科学 ›› 1995, Vol. 31 ›› Issue (1): 81-85.
• 研究简报 • 上一篇 下一篇
王爱静1,王成祥1,李中焕2
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Aijing Wang1,Chengxiang Wang1,Zhonghuan Li2
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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 Populus 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 stems and 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 ratio 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
王爱静,王成祥,李中焕. 大青叶蝉防治指标的研究[J]. 林业科学, 1995, 31(1): 81-85.
Aijing Wang,Chengxiang Wang,Zhonghuan Li. ON CONTROL INDEX OF TETTIGONIELLA VIRIDIS(LENNAEUS)[J]. Scientia Silvae Sinicae, 1995, 31(1): 81-85.
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表1
大青叶蝉卵痕对新疆杨为害症状[2]"
表2
大青叶蝉卵块量对一年生新疆杨树干含水量的影响"
表3
回归方程显蓍性测定①"
表4
卵块数量对一年生新疆杨生长量的影响"
表5
回归方程显著性测定"
表6
树干上卵块数与二年生新疆杨生长量的关系"
表7
表8
树干卵块数量对三年生幼树生长量的影响"