This paper studied the density and the condation of Pseudopeziza medicaginis (Clib) Sacc with the method of sampling, investigation and measurement in definite spots and times.
采用定点定期采样、调查、测定的方法，研究了紫苜蓿褐斑病的发生危害的程度及发病条件。
This paper studied the density and the condation of Pseudopeziza medicaginis (Clib) Sacc with the method of sampling, investigation and measurement in definite spots and times.
采用定点定期采样、调查、测定的方法，研究了紫苜蓿褐斑病的发生危害的程度及发病条件。
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