Greenhouse Vegetable Pest Control
First, the main types of diseases include seedling diseases such as gray mold (Botrytis cinerea), Sclerotinia, damping-off, and other fungal infections. In addition, there are also epidemic diseases like root rot, early and late blight in tomatoes, leaf mold, downy mildew in cucumbers, and bacterial angular leaf spot. These diseases can significantly impact crop health and yield if not managed properly. Second, the primary pests to watch out for are whiteflies (Bemisia tabaci) and the diamondback moth (Plutella xylostella). These pests can cause serious damage by feeding on plant tissues, transmitting viruses, and reducing overall productivity. Third, effective prevention and control measures are essential for managing these issues. For seedbed diseases, proper management is key. During cold weather, it's important to reinforce greenhouses, clear snow from the roof, and ensure good drainage. Multiple layers of covering materials—such as greenhouse films, small arch sheds, straw bags, and cotton waste—can help maintain warmth and reduce humidity. Applying dry soil to the surface of the seedbed and ensuring proper ventilation (without causing frost) can also prevent disease development. Additionally, applying 50% carbendazim at a rate of 8 grams per square meter can help protect young plants from infection, while avoiding direct contact with the seedlings. To manage Botrytis and Sclerotinia in the field, infected plants should be removed and deeply buried or incinerated. Spraying with 40% sclerotin or 50% acetomide suspension diluted 800–1600 times, or Nongliling at 2000 times, can effectively control these diseases. For root rot, maintaining good drainage after rainfall is crucial. Root irrigation with solutions such as Green Hunter No. 1 at 3000 times, Green Hunter No. 3 at 1500 times, or 70% thiophanate-methyl at 700 times can help prevent and treat the condition. Disease prevention can also be achieved through regular spraying with products like 72.2% Previcur at 800 times or 72% Topsin-M at 500 times. For cucumber downy mildew, timely application of appropriate fungicides is necessary to avoid severe losses. Tomato early blight can be controlled using a 500-fold dilution of 50% acetaminophen wettable powder, while late blight should be treated as soon as symptoms appear. Bacterial angular leaf spot can be managed with sprays such as 72% agricultural streptomycin at 4000 times, 77% Kocide (2000) at 600 times, or 47% Garnet at 600 times. It’s important to apply these treatments thoroughly, especially on the underside of leaves, for maximum effectiveness. For whitefly control, several methods can be used. One approach is fumigation using 12% Coshun tablets in greenhouses, applied at 200 grams per acre every 7–10 days when temperatures are low and seedlings are not too delicate. Another method involves using yellow sticky boards (30 cm x 40 cm) placed at 20 cm above the crop canopy, with around 30 boards per acre to trap adult whiteflies. Installing silver insect nets at the entrance of greenhouses can also help repel pests and reduce infestations. Chemical control options include 4% avicidacillin EC, 2.5% SM at 15–20 mL per 15 kg water, or combinations like 2.5% KF 2000 times + 4% Aviadine 20010 times, 2.5% Uranus 1500 times, 15% Jin Haonian 1500 times, 0.3% matrine 1000 times, 5% Fantagold 1000 times, or 25% Fenjing net 1000 times. These should be sprayed evenly, focusing on the underside of leaves, and repeated every 7–10 days for three consecutive applications. Rotating between different products helps prevent resistance. Avoid spraying during high humidity or rainy conditions. For diamondback moth control, Bt powder at 500 times, 2.5% dish hi at 1500 times, 5% iodide at 2000 times, or 5% fipronil at 2000 times can be used effectively. These biological or chemical controls target larvae and help reduce population levels without harming beneficial insects. 16MP PTZ Camera,63X Polar Day Panoramic AEW PTZ Camera,16MP Camera Tiandy Technologies CO.,LTD , https://en.tiandy.com