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Prevention of Cauliflower Stripe Virus Disease at the time
According to the author's field investigation, the actual occurrence of the striae spot virus in Shouguang City, our province, presents specific symptoms. The affected plant tissues show brown necrotic spots, with visible stripe-like patterns, mottled areas, and ring-shaped lesions. On sweet pepper fruits, distinct brown streaks and stripe spots are commonly observed. In severe cases, the symptoms may appear on the stems or shoots below the growing point.
To effectively manage this viral disease, several preventive measures should be implemented:
**Virus Inactivation and Disease Spread Control:**
- **Seed Treatment:** Soak seeds in 10% trisodium phosphate for 20 minutes before germination. This method is more effective than using potassium permanganate.
- **Environmental Management:** Viral diseases often have a long incubation period when conditions are not ideal. However, high temperatures and drought can accelerate viral replication, leading to symptoms such as mosaic patterns, stripes, and dry tops. Controlling temperature and humidity within greenhouses can significantly reduce the risk of infection.
**Key Production Management Techniques:**
- **Temperature Regulation:** Sweet peppers thrive at around 25°C during the day and no higher than 15°C at night. If temperatures exceed this range, shading should be increased, especially during the day.
- **Moisture Control:** Maintaining proper soil moisture and air humidity is crucial to prevent the onset of virus diseases.
- **Fertilization:** A balanced application of micronutrients, particularly zinc, helps enhance plant health and resistance to viral infections.
- **Removal of Infected Plants:** As soon as infected plants are identified, they should be removed from the field and either buried or burned to eliminate potential sources of infection.
**Transmission Route Interruption:**
- **Pest Control:** Insects such as aphids, whiteflies, thrips, and grasshoppers are common vectors of viral diseases. When these pests are detected, spraying with insecticides like Acetamiprid (1000 times dilution) or Imidacloprid (2000 times) can help control their population. Fumigants or systemic sprays like Aketai (2500 times) can also be used for long-lasting protection.
**Chemical Control:**
- At the early stages of infection, apply 20% copper hydroxide (500 times), 7.5% streptomycin (600 times), or 5% bacillus subtilis (300 times). Spray every 4 days for 3–5 applications.
- A combination of pyrimidomycin (2500 times) with a micro-fertilizer mix has shown good results.
- For an alternative solution, mix 25 ml of "Disease Resistance Wei," 15 ml of "Virus Ling," 30 g of "Virus A" or "Antiviral Feng," and 2 g of natural alizarin in 15 liters of water. This mixture is effective for both prevention and treatment.
These strategies, based on technical research and field trials, offer practical solutions for vegetable farmers to manage the striae spot virus effectively. Timely application and consistent monitoring are essential for long-term success.