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黑荆树流胶病是黑荆树(Acacia mea-rnsii De Wild.)常见的一种病害。染病株生长缓慢,严重时全株枯死。为了弄清流胶病的发生原因和发生规律,近年来我们进行了试验观察,现将结果报道如下。一、自然发病程度调查对全区范围内多数引种栽植点进行了调查,根据流胶病表现特点统计发病率和感病指数划分等级标准为: 级别分级标准代表数值一无病; 0二轻微流胶,泌胶呈滴状; 1
Vitex negundo is a common disease of Acacia mea-rnsii De Wild. Infected strains grow slowly, severe whole plant died. In order to clarify the occurrence of the occurrence of melasma and the occurrence of law, in recent years we conducted a pilot study, the results are reported below. First, the natural degree of disease survey of the region most of the introduction of planting sites were surveyed, according to the performance characteristics of meningitis disease statistics and morbidity index classification criteria for grade: level grading standards on behalf of the value of a disease-free; 0 two slight flow Gum, secretosa plastic drop; 1