Some of the exposed cucumbers were vulnerable to viral infections in July, which were caused by three main viruses: Cucumber Mosaic Virus (CMV), Melon Mosaic Virus (MMV), and Tobacco Mosaic Virus (TMV). During the growth period of cucumbers, mixed infections often occur. Symptoms typically appear on the upper parts of tender leaves, where some leaves show dark green discoloration, wrinkled surfaces, uneven texture, or even fern-like deformities. These conditions may lead to stunted growth, wilting, and overall plant decline.
To effectively manage these viral diseases, a comprehensive approach is essential. This includes planting resistant varieties, improving cultivation practices, and applying proper disease control measures. First, it's important to cultivate strong, healthy seedlings and apply adequate amounts of phosphorus and potassium fertilizers to enhance the plants' natural resistance. Field hygiene is also crucial—farmers should wash their hands with soap after handling infected plants or tools.
Insect vectors like aphids play a major role in spreading these viruses, so controlling them is vital. Especially during the seedling stage, regular monitoring and early intervention are needed. When aphids are detected, insecticides such as imidacloprid, acetamiprid, or avermectin can be used for effective control. In the early stages of viral infection, spraying 20% virus A wettable powder diluted at 500 times or 20% virus wettable powder at 600 times can help reduce the spread. Other agents like fluoroquinolone (norfloxacin) have shown good inhibitory effects on the virus.
Plants affected by viral diseases often continue to grow, though they may not thrive as well. Applying growth regulators that stimulate plant development can help maintain productivity even under infection stress. These products encourage blooming and support the plant’s overall health.
If the infection is severe, a combination spray is recommended. The mixture includes 0.16% anti-sick Wei (virus K), 0.16% virus will be grams (or other virus-inactivating agents), medical norfloxacin (one tablet per liter of water), 0.16% zinc sulfate, and either natural cloudworm (Jinyunda-120) or naphthaleneacetic acid at 5 mg/L. The first application should be more concentrated, followed by regular sprays every 1–2 days.
For each sprayer containing 15 liters of water, the recommended quantities are: 25 mg of anti-disease agent, 25 g of virus control agent, 25 tablets of norfloxacin, 30 g of zinc sulfate, and 1.5 g of natural cloudworm. This combination has proven effective in managing viral outbreaks and supporting plant recovery.
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