Overwintering spinach refers to the cultivation of early spring vegetables based on the cultivation mode of small arches. Due to the long-term high temperature and high humidity environment during the growth process, it is easy to cause diseases. The main common diseases are damping-off, heart rot, downy mildew, and viral diseases.
1. Triploid disease: It is the main disease during the seedling stage of spinach. After the cotyledon develops, the disease is seen. The base of the seedling stem shows a light brown water stain, and the base rot occurs. The seedling has not yet withered and fallen down. When the humidity is high, the disease minister produces a layer of white cotton flocculent mycelium, and the low temperature and humidity greatly expand rapidly.
2. Heart rot: The main damage to the stem base of spinach, leaves, stems, roots can be victimized, seed-borne spinach germination not found after the emergence of the disease, unearthed seedlings and some heart leaves rot, and some stem base browning, contracture , causing tripping, resulting in lack of seedlings broken ridge.
3. Downy mildew: The main damage to the spinach leaves, the sick class began to pale yellow dots, the edge is not obvious, gradually produce gray mold layer on the lesions on the back, gray purple later, the leaves were positive macular. The lesion expands upward from the lower part of the plant. Mainly through the use of air currents, rainwater, agricultural implements, insects and agricultural operations spread. The temperature was heavy at low temperatures and high humidity at 10°C and 85% relative humidity.
4. Viral disease: It is a major disease of spinach. After onset, the leaves were not evenly crushed, the leaves were small, some of the hearts were distorted, and the new leaves turned yellow. Aphids and migratory locusts are the main routes for transmission of viral diseases.
Control methods:
1. Blemishes: Use 58% Methodyl Manganese Zinc Wettable Powder 800 times, or 72.2% Prolactin 400x Spray.
2. Heart rot: At the beginning of the disease, use 36% Thiophanate Suspension 500x, or 72.2% Precq 400x.
3. Downy mildew: In the early onset of the disease, use 58% of methyl frost Mn wettable powder 500 times, or 75% of chlorothalonil wettable powder 600 times, or 75% of DuPont Ke Lu wettable powder 800 times spray.
4. Viral diseases: (1) Control locusts in time and reduce mediators. (2) In the initial stage of disease, spray with a 1.0% 1000% solution of Lingzhi Emulsion or 20% of a virus A WP 500 times.
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