Cucumber downy mildew is one of the most common and most serious diseases occurring on cucumbers. It can occur during the entire growth period of cucumbers, and mainly damages the leaves. After the leaves were damaged, water-stained pale green spots appeared and gradually became yellow-green and yellow. All parts of our city have occurred, causing great threats and losses to the production of cucumbers. Therefore, we must take preventive measures for cucumber downy mildew.
First, use resistant varieties. According to a few years of cultivation practice, it has been shown that the Jinyan series cucumbers and the Jinchun No. 4 cucumber have certain resistance to downy mildew. Those cucumber species that are self-retained and some local varieties, such as white cucumbers in Dongyang, are susceptible to downy mildew. Some farmer cucumbers have just started to suffer serious downy mildew resulting in an unrequited harvest. Therefore, special attention should be paid when selecting seeds.
Second, strengthen the cultivation and management, so that fitness training. The cucumbers should be planted in high-lying, well-drained sandy soil plots. Fertilization should be combined with nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer to increase the disease resistance of plants. Greenhouse plastic greenhouses and other protective cultivation must grasp the temperature of the greenhouse and the greenhouse. In the field, there should be no water in the ditch, and after the rain, the loose soil should be taken and the soil should be properly cultivated. The straw and wheat straw can be used to cover the surface of the mound. To timely pruning, leafing, in the late growth period can be used 0.3% urea or 0.2% potassium dihydrogen phosphate for foliar dressing.
Third, chemical control. When the central diseased plant is found in the field, it can be sprayed with 40% alfa-aluminum 300-fold or 25% metalaxyl 600-fold, 64% antiviral 500 times, 70% mancozebite 500 times, etc., at intervals of 7-10 days. , determine the number of medications based on the condition and weather conditions. Flue-cured shelters such as plastic greenhouses can also be used, such as 45% chlorothalonil smoke agent 200-250 grams per acre, in the evening after the closing shed split 4-5, with dark fire ignited smoke overnight, the next day ventilation , every 7-8 days, can effectively control the incidence.
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