دانلود پاورپوینت بیماری‌های cucumber

 قسمتی از اسلاید متن پاورپوینت :  تعداد اسلاید : 20 اسلاید عنوانبیماری‌های cucumber Powdery Mildew caused by the fungus Erysiphe cichoracearum, affects cucumber, muskmelon, pumpkin, and squash. It is caused by a fungus that appears as a white powdery growth on leaves. Crown leaves are affected first and may wither and die. The fungus can be introduced on greenhouse-grown plants or by wind from areas with relatively warm winter climate where the fungus can over-winter. Disease de ...