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泡桐在许昌地区已栽植3千余万株,是一大优势。但是,1981年在林木病虫害普查中,发现片林、四旁林木和农桐间作林中,泡桐腐烂病发生普遍,个别地块比较严重。使泡桐的成材质量和数量都受到较大影响。为此于1981年秋对此病害进行多点防治试验,其结果如下:
Paulownia in Xuchang area has planted more than 30,000 strains, is a big advantage. However, in 1981, in the census of forest diseases and pests, it was found that there were common occurrences of paulownia decay in the inter-crop forests of the patch forests, four-sided trees and agrofotophora, and the individual plots were more serious. So that the quality and quantity of Paulownia are greatly affected. To this end in the fall of 1981 to carry out more control of the disease test, the results are as follows: