دانلود پاورپوینت بیماری‌ های 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 overwinter. Disease development is favored by high temperatures Downy Mildew on cucumber and muskmelon is caused by t ...