The Causes and Control of Cucumber Downy Mildew

Downy mildew is a kind of epidemic disease. It mainly damages the leaves. When the cotyledon suffers, irregular chlorotic spots appear on the front. On the back of the wet conditions, a layer of gray and black mold develops. As the disease progresses, the cotyledons turn yellow and dry. When the temperature is at 15~20°C and the relative humidity is above 85%, especially when there are more frequent rains or heavy fog days, when the water film is on the leaves, the bacteria rapidly spread. Therefore, controlling temperature and reducing humidity are key measures to prevent cucumber downy mildew.

Control methods:

1, according to local conditions, select disease-resistant varieties.

2, using the rotation, mulching, keep the soil temperature to prevent evaporation.

3, strengthen ventilation.

4. Chemical control, spraying 80% mancozeb 600 times liquid before disease occurred, 7 days to 10 days to protect cucumber from downy mildew. Once the central disease strain is found, 75% chlorothalonil wettable powder can be sprayed with 600 times of liquid, and the disease can be effectively controlled every 7 to 10 days.

Handheld Glycohemoglobin HbA1c Analyzer

Hba1C Device,Diabetes Test,Glycohemoglobin Test,Glycosylated Hemoglobin Test

Wuxi BioHermes Bio & Medical Technology Co., Ltd. , https://www.biohermesglobal.com