论文部分内容阅读
松树枯梢病是一种树木衰退病。其病原至少可分为诱导因素、激化因素、促进因素三类。诱导因素包括立地条件中的母岩种类、土层及腐殖质层厚度、土壤水分、气候及污染等;激化因素为松毛虫、介壳虫、松梢螟和其它病虫的危害,以及风折、雪压、干旱、水涝等;促进因素主要为病原真菌——松色二孢菌Diplodia pinea的侵染。不同病原因素,不同立地条件和不同树龄出现不同的症状,主要有:顶(芽)死型、枯叶型,枯梢型、丛枝(多头)型、根腐(枯萎)型、软枝型、生长不良型。
Pine blight is a tree recession. The pathogen can be divided into at least inducing, exacerbating and promoting factors. The inducing factors include the types of parent rock in site conditions, the thickness of soil layer and humus layer, soil moisture, climate and pollution; the exacerbating factors are the damage of pine caterpillars, scale insects, pine stem borers and other pests and diseases, Pressure, drought, waterlogging and so on. The promotion factor is mainly the infection of the pathogenic fungus Diplodia pinea. Different pathogenic factors, different site conditions and different age showed different symptoms, there are: top (bud) dead type, dead leaf type, dry shoot type, Congzhi (long) type, root rot , Poor growth.