虽然它们都依靠吸铁杉的树汁存活，但球蚜同时还把有毒的化学液体注进了树木。
Although both feed by draining the hemlocks of their juices, the adelgids also inject toxic chemicals into the trees.
球蚜的分布与寄主植物的分布相一致，主要是北半球温带和亚热带高山。
The distribution of Adelgidae is coincident with their host plants, mainly in temperate zone and sub-tropical mountainous areas of the Northern Hemisphere.
球蚜具有包括异寄主全周期、异寄主不全周期、同寄主不全周期等复杂的生活周期，形成虫瘿是其主要的为害特征；
Adelgidae has multifarious life history that consist of heteroecious holocyclic, heteroecious anholocyclic and monoecious anholocyclic. Its primary injured symptom is to form galls.
球蚜具有包括异寄主全周期、异寄主不全周期、同寄主不全周期等复杂的生活周期，形成虫瘿是其主要的为害特征；
Adelgidae has multifarious life history that consist of heteroecious holocyclic, heteroecious anholocyclic and monoecious anholocyclic. Its primary injured symptom is to form galls.
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