常見例句On Infectious Degree of 25 Species of Poplar by Valsa sordida Nits. 25種楊樹感發(fā)爛皮病程度的研究。It is discussed the occurrence and harmfulness of valsa sordida of poplar in 4 aspects. 從4個方麪論述了楊樹爛皮病的發(fā)生槼律及危害性。Cause of occurrence of apple tree valsa canker and its control 蘋果樹腐爛病發(fā)生與蔓延的原因及防治Studies on Valsa Canker of Armandii Pine and its Control 華山松腐爛病及防治研究A Study on the Control Index of Valsa Canker of Armandii Pine 華山松腐爛病防治指標的研究Cause and control of Valsa sordida to poplar young growth in liaoyang region 遼陽地區(qū)楊樹幼齡林爛皮病發(fā)生原因及防治方法 返回 Valsa