First, the variety of greenhouse vegetable virus disease
In recent years, more than 50 viral diseases common to vegetables have shown a trend of development, and almost all vegetables have viral diseases. In addition, there are several viral diseases on a crop. Once the disease occurs, lighter people reduce production by 3 to 50%, and those who suffer severe diseases will never produce. Here are the main symptoms of four viral diseases:
1. Mosaic virus disease
The top leaves showed: leaf shrinkage, yellow and green spots on the leaves. For example, cucumber mosaic virus disease.
2, fern leaf virus disease
The top leaves appear to be thicker or thinner in the leaf deformation, flushed on the veins, upright, or linear in leaves. Such as tomato fern leaf virus disease.
3, roll leaf virus disease
Leaf curl virus disease is characterized by leaf distortion and upward curling. Physiological rolling leaf disease, is the whole plant leaf rolling, leaf wrapped, cylindrical; virus disease is the top young leaf curl. The cause of physiological leaf curling is due to high temperature, drought, or excessive desiccation or aging.
4, streak virus disease
Stripe virus disease mainly occurs on fruits and tender stems. For example, chilli stripe virus disease turns yellow upwards from the tip of the pepper, and the vegetable grower is often referred to as "yellow tip". A short brown streaks and depressions appear on the yellowed areas. Tomato stripe virus disease, the surface of the fruit is bluish-white, gradually turning greenish-brown and non-colored. The vegetable grower is often referred to as "Pink fruit." Cross-sectioning the fruit with a knife reveals brown stripes outside the skin. Severe brown-brown spots appear on the leaves and dark brown patches appear on the stems.
Second, prevention and control measures
1. Immediately after transplanting, spray and irrigate with “Tianda-2116†1000 times solution and Tianda Yufeng 1000 times solution to promote disease prevention.
2. Use "Tianda-2116" 1000 times solution + Tianda Yufeng 1000 times solution or 7.5% Keduling agent 600 times solution, 20% virus Ning 500 times solution, Ningnanmycin agent 500 times solution, etc. After the planting, the first fruit period and the full fruit period, spray once. The drug was stopped 5 days before harvest.
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