研究制定出青杨虎天牛的防治指标，为科学合理、经济有效地治理该虫提供了理论依据。

The research has provided the prevention standards, providing the theory basis for resolving the problem of the pest in scientific, proper, economical and effective ways.

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单宁含量与青杨脊虎天牛虫口密度之间存在比较明显的负相关性。

Negative correlation between tannin content and larvae density of X. rusticus was obvious.

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