久树(Schleichera trijuga Willd)是南亚和东南亚产紫胶国家紫胶虫的优良寄主树。印度利用库斯弥(Kusum)胶虫品系,在久树上放养夏代和在儿茶(Acacia catechu(L.f.)Willd)上放养冬代,通过轮流交替放养,获得质量最好的紫胶产品。六十年代,中国科学院西双版纳植物园从国外引进久树。1978—1979年我所与植物园协作,对久树进行放养紫胶虫鉴定,与此同时将久树引种到云南景东进行繁殖栽培和 Schleichera trijuga Willd is an excellent host tree for lacongoides in South and Southeast Asia. In India, the best quality shellac product was obtained from the Kusum gumworm strain in the summer and in the winter on Acacia catechu (L.f.) Willd, alternately by turns. Sixties, the Chinese Academy of Sciences Xishuangbanna Botanical Garden from abroad for a long time. 1978-1979 I collaborate with the Botanical Garden, the long-tree stocking lactea identification, at the same time the long-tree introduced to the Jingdong in Yunnan for reproductive cultivation and