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桤术(Alnus cremastogync Burk.)生长迅速,喜生长于河岸、溪旁等比较潮湿的地方,是护岸固沙的良好树种,也是制作胶合板、矿柱以及拦洪水椿的良好用材。在四川的川西平原,不仅沿岷江两岸有天然或人工栽植的桤木林,而且在田边、溪旁、沟旁及住宅四周到处都有散生桤水。可是在桤木生长过程中,经常遭受到许多食叶害虫的为害,严重影响其生长。笔者于1958年5至9月在四川灌县作了调查,并对主要虫种的生活习性及防治方法进行过一些观察和试验。现兹将结果初步整理于后,供进一步研究和防治的参考。
Alnus cremastogync Burk. Grows rapidly and likes to grow in wet places such as riverbanks and brooks. It is a good tree species for sand bank protection and a good material for making plywood, pillars and flood blocking piles. In Sichuan’s western Sichuan plain, there are not only natural and cultivated alder wood along both sides of the Minjiang River but also scattered water around the fields, streams, ditches and houses. However, during the alder growth process, it is often damaged by many leaf-eating pests and seriously affects its growth. From May to September 1958, the author made a survey in Guan County, Sichuan Province, and made some observations and experiments on the living habits and control methods of major insect species. Now the results will be initially sorted for reference for further research and prevention.