The presence of scales kept the adelgid's numbers down, which led to less toxin and healthier hemlocks.
介壳虫在与球蚜同栖时挤掉了部分数量的后者,减少了铁杉的中毒量及树木受害的程度。
aphidicolous:蚜栖的, 喜蚜的
aphides | 蚜虫 | aphidicolous | 蚜栖的, 喜蚜的 | aphidilutien | 蚜黄液