京津大白菜及其他十字花科作物霜霉病菌生理分化的初步研究
A PRELIMINARY STUDY ON THE PHYSIOLOGICAL DIFFERENTIATION OF THE DOWNY MILDEWS (PERONOSPORA PARASITICA (PERS.) FR.) OF CHINESE CABBAGE AND OTHER CRUCIFEROUS VEGETABLES IN THE VICINITY OF PEKING AND TIENTSIN
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