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本文报道了几种不同抗虫性能木麻黄的基本营养物质、酚类等化学物质及木材纤维形态等检测结果，分析了木麻黄化学和形态因素与星天牛危害的关系，探讨了木麻黄抗虫机理。木麻黄树皮中的基本营养物质含量的分布差异不显著，木质部的则有明显差异，即随抗虫性能增强而含量降低，造成各品系木麻黄木材内部环境差异，形成蛀干害虫星天牛生存环境的差异。高感品系Ｃ２３可溶性总糖含量（２．８０％）明显高于高抗品系Ｃ４４（０．６２％），是高抗品系的４．５２倍；游离氨基酸含量：高感品系Ｃ２３（１．８５７ｇ）是高抗品系Ｃ４４（０．９５５ｇ）的１．９４倍；同时采用葡萄糖溶液和清水对比浸泡木段，木段模拟蛀道接星天牛幼虫饲养试验，也验证了葡萄糖含量的增加有利于星天牛幼虫生存率的提高，说明木质部营养物质的含量与星天牛幼虫生长发育密切相关。酚类化合物中如邻苯二酚、咖啡酸在高抗品系Ｃ４４中含量明显高于其它品系。木材纤维形态，高抗品系Ｃ４４木材纤维平均长度为０．７７ｍｍ，平均宽度为１２．０７μｍ，长宽比为６３．６，是所有参试品系中最大的，说明该品系木材韧性最强，抗弯强度最高，造成星天牛啃食困难，与其既抗虫又抗风的性能相吻合。
In this paper, we report the detection results of several basic woody yellow nutritious substances such as Casuarina equisetifolia, phenols and other chemical substances and the morphology of wood fiber. The relationship between the chemical and morphological factors of Casuarina equisetifolia and the damage of Astrodia formosa was also discussed. Insect mechanism. The distribution of essential nutrients in Casuarina equisetifolia bark was not significantly different, but significant differences were observed in xylem, that is, decreased with the increase of insect resistance, resulting in the differences in the internal environment of Casuarina wood var. Differences in living environment. The total soluble sugar content (2.80%) of high susceptible strain C23 was significantly higher than that of high resistant strain C44 (0.62%), 4.52 times higher than that of the high resistant strain. Free amino acid content: C23 (1.857g ) Was 1.94 times higher than that of high resistant strain C44 (0.955g). Meanwhile, compared with the soaking of wood blocks by glucose solution and water, the experiment of simulating tunneling with Asteroidus larvae in mulching stage also verified that the increase of glucose content was in favor of Astrology larvae survival rate increased, indicating that the content of xylem nutrients is closely related to the growth and development of asteraceae larvae. Phenolic compounds such as catechin, caffeic acid in the high resistant line C44 content was significantly higher than other strains. Wood fiber morphology, high resistant C44 wood fiber average length of 0.77mm, the average width of 12.07μm, aspect ratio of 63.6, is the largest of all the tested strains, indicating that the strains of the strongest wood toughness, resistance Bending strength is the highest, resulting in difficulty eating gypsophila, which is consistent with its performance of insect-resistant and wind-resistant.