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Causes of yellow spots on cucumber leaves
According to your description, it should be cucumber downy mildew, commonly known as "running horse", the diameter of the diseased leaf lesions 0.2-0.5 cm, when the back of the lesion produces a gray brown moldy material, when severe leaves from the yellow dry. 90% triethylphosphonate (ethylaluminophosphate) wettable powder 400 to 500 times liquid, 38% causticus copper (30% oxaclophane; 8% pyraclostrobin) 800 times, 25 % Metalaxyl (Drupoviral) WP 800 times, Corvo fluorescein Fermilab 1200 times; 64% WP WP 600 times, 70% EDP Zn WP 500 times , 72% Ke Kang Ling (Ke Lu, Ke Frost Cyanide, Cream Urea Manganese Zinc) WP 800 times, 75% chlorothalonil WP 500 times, spray every 5 to 7 days, the above agents should be Alternate use to prevent drug resistance.