Influence of Environmental Factors and Cultivation Measures on Bacterial Black Spots in Walnuts
In order to identify the relationship between the occurrence of black spot disease in walnuts and walnut varieties,growing environment,and cultivation measures,the disease index of 17 walnut varieties,environmental factors such as habitat elevation,topographic slope,rainfall,temperature,canopy density,and ground coverage rate,as well as cultivation measures including irrigation frequency,prevention and control frequency,and the necessity of clearing the orchard were investigated.Principal component analysis and correlation method were used to analyze the relationship between environmental factors,cultivation measures,and the occurrence of bacterial black spots in walnuts.The results show that:(1)according to the disease index of 17 walnut varieties,Zhongqiangtele,Liaohe 1,and Xifu are disease-resistant varieties;(2)the disease index of black spots in walnuts has a strong correlation with canopy density,prevention and control frequency,and necessity of clearing the orchard;it is positively correlated with canopy density and negatively correlated with the prevention and control frequency and necessity of clearing the orchard;in addition,it is negatively correlated with average temperature,ground coverage rate,and disease index;(3)the incidence rate of black spot disease in walnuts is significantly positively correlated with rainfall and negatively correlated with elevation.It is suggested that the habitat conditions should be considered during the promotion,and a reasonable layout that the distance between the two trees should be more than 6 m,and the canopy density should be controlled below 0.6,is favorable.Tree management work such as orchard clearing,irrigation,and prevention and control should be done to reduce the occurrence of walnut diseases.
bacterial black spots of walnutsenvironmental factorscultivation measures
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NSTL
万方数据
