核桃溃疡病发生相关因子的调查与研究

Investigation and prevention of walnut canker disease

在溃疡病普遍发生的河北省唐县核桃林进行系统调查,分析影响发病的主要因素。发现在唐县核桃林内,绿岭、辽系、清香3个核桃品种上溃疡病发生率分别为66.43%,52.34%,75.22%,不同品种对溃疡病的抗性无差异。树皮厚度与病害发生无相关性,树皮含水量是影响发病的关键因素,随着树皮含水量减少,树体衰弱,病害发生变重。健康核桃树的树皮含水率均保持在70%以上,病树的树皮含水率基本在60%以下。土壤的毛管孔隙度越大、含水量越低、容重越大,核桃溃疡病发生越重。

We systematically investigated the walnut forest in Tang County,Hebei Province,where walnut canker disease commonly occurred,and analyzed the main factors affecting incidence.The results showed that the incidence of walnut canker disease in Lvling,Liaoxi,and Qingxiang walnut cultivars was 66.43%,52.34%,and 75.22%,respectively.There was no difference in resistance to canker disease among different cultivars.There was no correlation between bark thickness and disease occurrence.The bark water content was the key factor affecting the disease.With the decrease in bark water content,the tree weakened and the disease became heavier.The bark water content of healthy walnut trees remained above 70%,while the bark water content of diseased trees was basically below 60%.The experimental study also found that the larger the soil capillary porosity,the lower the water content,and the greater the soil bulk density,the more serious the walnut canker.Through the prevention and control of walnut canker,it was found that Bacillus amyloliquefaciens G1 had an inhibitory effect on walnut canker,and the indoor inhibition rate was 48.62%.