It is discussed the occurrence and harmfulness of valsa sordida of poplar in 4 aspects.
从4个方面论述了杨树烂皮病的发生规律及危害性。
In this paper, the occurrence and harmfulness of bacterial wilt in Liangshan were described, and the control measures of this disease were proposed.
本文论述了凉山州马铃薯青枯病的发生、危害情况，提出了防治青枯病的建议。
The article discusses occurrence reasons of hydraulic system pollution and temperature rise and the harmfulness to hydraulic system. It also discusses how to take preventive measures.
论述液压系统污染与温升的产生原因及其对液压系统的危害，并阐述了预防和处理措施。
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