Spinach Downy Mildew: Prevention and Control Methods and Fungicide Recommendations (with pictures)

Spinach is one of the most commonly eaten vegetables; every time I go to eat hot pot I always order a portion of spinach to blanch and eat. Spinach sells well in all four seasons, and nowadays many farmers generally grow spinach in greenhouses so that it can be supplied to the market normally. During the growing process, what cannot be avoided is spinach downy mildew, so how should the downy mildew you encounter be prevented and controlled? What fungicide is good to spray? Here is a summary for everyone:

I. Key points of spinach downy mildew

1. Introduction to the symptoms of spinach downy mildew

It first damages the upper surface of the spinach leaves; the lesions are pale yellow and of varying sizes. In drought the diseased leaves turn withered and yellow, while when humidity is high the leaves rot, and in severe cases the entire plant's leaves turn yellow until they wither and die.

2. Introduction to the causes of spinach downy mildew

Spinach plants that are not vigorous or planted too densely, damp conditions, or sowing too early can trigger downy mildew.

3. Introduction to the conditions for spinach downy mildew

The pathogen of spinach downy mildew overwinters as mycelium in overwintering spinach and on seeds, or as oospores in diseased plant residues, and is spread by airflow, rain, irrigation water, farming tools, insects and cultivation operations, becoming the primary infection source; under conditions of 7-16 degrees temperature and rainy, humid weather it carries out repeated infection.

II. How to prevent and control spinach downy mildew?

If spinach downy mildew occurs every year when growing spinach, it will affect the spinach yield, and affecting the yield will reduce farmers' income, so prevention and control is the most important thing. The prevention and control methods are introduced as follows:

1. Select spinach varieties resistant to downy mildew.

2. Pull out diseased plants. In early spring, if downy mildew diseased plants are found in the spinach field, pull them out promptly and carry them out of the field to be burned.

3. Practice crop rotation. Before sowing, treat the seeds with New High Lipid Film, sow at the appropriate time, and then spray the surface with New High Lipid Film to keep it warm and preserve soil moisture, improving the emergence rate.

4. Field management: reasonable close planting, scientific watering, preventing flood irrigation, strengthening ventilation, and reducing humidity.

Doing the above 4 points of prevention and control work will greatly reduce the incidence of spinach downy mildew.

III. What fungicide is good to spray for spinach downy mildew?

During the spinach growth stage, spray Zhuangjingling at the appropriate time to make the plant stems thick and the leaves plump, improve the spinach's disease resistance, reduce the amount of pesticide and chemical fertilizer used, lower residual toxicity, and improve the spinach's natural taste.

In the early stage of spinach downy mildew, you can spray with Ridomil wettable powder, thiophanate-methyl wettable powder, chlorothalonil wettable powder, Daconil, metalaxyl mancozeb, fosethyl aluminum wettable powder, Previcur aqueous solution, Shuangke suspension concentrate, etc. For all the above prescriptions, apply the pesticide at the early stage of disease, spraying once every 6 days, for 3 consecutive sprays. It should be noted that spraying must be stopped 15 days before spinach harvest; if the disease occurs after growth, harvest and bring to market promptly, and there is no need to spray, so that the pesticide will not remain on the spinach and harm the human body.

Summary: The above content is an introduction to the prevention and control of spinach downy mildew and its treatment with fungicides, and I hope it can help grower friends in need. This article is compiled from relevant professional knowledge.