陕西凤翔侧柏叶枯病发生规律及防治技术

Outbreak of Platycladus orientalis Blight and Control Measures

为巩固和提高退耕还林成果,对凤翔区侧柏常见病——叶枯病发生现状与规律进行了调查,结果为凤翔区侧柏林面积7519.68 hm^(2),约占林地总面积45%,连续多年侧柏枯枝病发生较重,累计发生面积2000 hm^(2),植株发病率20%~70%,成因主要是大面积单一树种造林,造林中栽植密度大(不低于2800株·hm^(-2)),外地种源苗木抗病性较弱,夏季降雨量集中有利于病菌侵染,春末干旱少雨侧柏树势衰弱有利于病害大爆发等,可采取人工药剂防治、无人机药剂防治、间伐抚育、营造混交林等防治方法。

Platycladus orientalis forest in Feng County,with an area of is 7519.68 hm^(2),accounting for 45%of total forest land,is suffering from blight disease these years,the cumulative area of the disease has reached 2000 hm^(2),with infection rate 20%to 70%.The main cause to the disease is the mono species for afforestation,higher density maintained,external source of seedlings,more rainfall in summer but little in spring.The prevention and control measures and methods were suggested.