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榆树是我国北方的重要用材树种,榆属中的白榆(Vlmus Pumilα)在我省分布广泛,生长迅速,材质优良,适应性强,耐干旱,耐盐碱,是四旁绿化及盐碱地造林的主要树种之一。但白榆在栽培中普遍受到榆兰金花虫的危害,严重时常常把树叶全部吃光,影响榆树的正常生长。我省因榆兰金花虫为害每年约损失木材50多万立方米,价值达5500余万元,给榆树的生产和发展带来了很大的困难。 1983年,河北省林业科学研究所白榆良种选育课题组,在榆树选优过程中,发现了白榆的抗榆兰金花虫个体。1985年开始对其进行专
Ulmus is an important timber species in the north of China. Vlmus Pumilα in Ulmus is widely distributed in the province, with rapid growth, good material, adaptability, drought tolerance and salt-tolerance. It is the main plantation of afforestation and saline- One of the species. However, Elm Ulmus is generally harmed by Ulmus pumilum in cultivation. In severe cases, the leaves are often eaten and affect the normal growth of Elm. In our province, about half a million cubic meters of wood is lost due to the damage of Ulmus lactiflora, reaching a value of more than 55 million yuan, which has brought great difficulties to the production and development of elm trees. In 1983, Hebei Academy of Forestry Institute of fine white elm seed selection project, in elm selection process, found elm anti-Ulmus gilt’s individual. 1985 began to carry out its special