黑龙江省主栽杨树品系干部单宁含量与青杨脊虎天牛危害的关系

Relationship between Tannin Content of Main Poplar Strains and Damage of Xylotrechus rusticus (L.) in Heilongjiang Province

为了探讨决定杨树抗性的生理因素,测定了不同品系杨树中木质部、韧皮部的单宁含量,并调查了杨树的被害株率与虫口密度,分析了杨树中单宁含量与青杨脊虎天牛危害的关系。结果表明,不同杨树品系间韧皮部单宁含量差异极显著,木质部单宁含量差异不显著;杨树各品系的单宁含量与杨树的被害株率关系不紧密。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。小青杨单宁含量高,但株被害率高,株平均虫口密度低。小黑杨单宁含量较低但不受害,其抗虫机理有待进一步研究。外源施用单宁对青杨脊虎天牛有忌避作用。

Tannin contents in xylem and phloem of different poplar strains were used to study the physiological factors of poplar resistance, and its relationships with damaged ratio of poplar and larvae density of Xylotrechus rustieus （ L. ） in poplar stems were analyzed. Results showed that a significant difference in tannin content was found in phloem of different poplar strains, while the difference in xylem was not obvious. Negative correlation between tannin content and larvae density of X. rusticus was obvious. Populus pseudo-simonii had high tannin content, but also had high damaged ratio and low average larvae density, while P. simonii × P. nigra had low tannin content, but was not damaged by X. rusticus. The resistance mechanism needs to be further researched. Applying tannin to poplar stems has a repellent effect on the adults of X. rusticus, which has a positive relation with tannin dosage.