| 平榛白粉病发生规律的研究 |
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| 引用本文： | 王忠.平榛白粉病发生规律的研究[J].防护林科技,2016(7):46-48. |
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| 作者姓名： | 王忠 |
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| 作者单位： | 铁岭市林业科学研究院,辽宁 铁岭,112000 |
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| 摘 要： | 采用野外定点观察、抽样调查和室内试验测定等方法,对平榛白粉病的发生规律进行了研究,结果显示:平榛白粉病各个发生阶段症状特点明显,每年发病初期为5月下旬~6月初,叶面和叶背均能出现明显的褐斑,表面覆盖白粉状物;发病高峰期为6月下旬~7月下旬;8月末秋季在白粉层上散生闭囊壳。病原菌侵染循环周期为1年,1、2年生植株相对抗侵染能力较弱,随着林龄增加,抗侵染能力增强。榛林密度大,病害发生率较高,北坡榛林病害发生程度较南坡严重。可通过调整榛林密度增加通风透光度,控制病害发生与发展。
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| 关 键 词： | 平榛 白粉病 发生规律 |
Occurrence Law of Powdery Mildew Damaged Corylus heterophylla |
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| Abstract: | Occurrence law of powdery mildew were studied by using sentinel field observations,sampling and labora-tory tests .Result shows that symptoms characteristic of powdery mildew damaged Corylus heterophylla in each stage are significant;incidence in initial stage is from late May to early June every year;foliage and dorsal can appear obvious brown spots;surface was covered with white powder substance.Peak incidence is from late June to late Ju-ly.Small particles scattered on a layer of white powder (closed capsule shell)in late August.Cycle of pathogen in-fection is one year;anti-infection capacity of 1 & 2-year-old plant are weak,anti-infection capacity increase with the increase of the forest age;density of hazel forest is great and incidence of disease is higher;extent of disease damaged hazel forest in northern slope is more serious than that in the southern slope .The ventilation transmittance can be increased by adj usting density of hazel forest and occurrence and variation of disease can be controlled. |
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| Keywords: | Corylus heterophylla powdery mildew occurrence law |
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