Greenhouse Vegetable Pest Control
First, the main types of diseases include seedbed diseases such as damping-off, gray mold (Botrytis cinerea), Sclerotinia, and other fungal infections. In addition, there are epidemic diseases like root rot, tomato early and late blight, leaf mold, cucumber downy mildew, 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 severe damage to crops by feeding on leaves, transmitting viruses, and reducing plant vigor. Third, effective prevention and control measures are essential to maintain healthy crops. For seedbed diseases, it's important to manage the environment carefully. During cold weather, ensure the greenhouse is well-secured, the roof is clear, and drainage ditches are unblocked. Multiple layers of covering materials such as greenhouses, small arch sheds, straw mats, and sacks can help maintain warmth and reduce humidity. Apply dry soil on the bed surface and ventilate when temperatures are safe to avoid freezing. To prevent Botrytis and Sclerotinia in the field, infected plants should be removed and buried or burned. A 40% sclerotin or 50% acetomide suspension diluted 800–1600 times, or Nongliling at 2000 times, can be used for spraying. For root rot, ensure proper drainage after rain and apply a 3000x solution of Green Hunter No. 1, 1500x of Green Hunter No. 3, or 700x of 70% thiophanate-methyl. For general disease prevention, spray with 72.2% Previcur at 800x or 72% mancozeb at 500x. Cucumber downy mildew can be controlled with appropriate fungicides. Tomato early blight can be treated with a 500x solution of 50% carbendazim wettable powder, while late blight requires similar treatments. Bacterial angular spot can be managed with 72% agricultural streptomycin at 4000x, 77% Kocide at 2000x, or 47% Gnat at 600x. For whitefly control, several methods are available. Fumigation using 12% Coshun tablets in greenhouses is effective, especially when temperatures are low and seedlings are not too small. Use 200 grams per acre, and repeat every 7–10 days. Yellow sticky traps can also be used to attract and trap whiteflies. Hang 30 cm × 40 cm yellow boards at a height of about 20 cm above the crop canopy, with 30 boards per acre. Silver insect nets can act as a physical barrier, preventing pests from entering the greenhouse by repelling them. Chemical control options include 4% avicidacillin EC, 2.5% SM, or 2.5% KF at 15–20 mL per 15 kg of water. Other options include 2.5% Uranus at 1500x, 15% Jin Haonian at 1500x, 0.3% matrine at 1000x, 5% Fantagold at 1000x, or 25% Fenjing net at 1000x. When applying, focus on the underside of leaves and ensure even coverage. Repeat every 7–10 days for three applications, alternating products to prevent resistance. Avoid spraying during high humidity or rainy conditions. For diamondback moth control, use Bt powder at 500x, 2.5% dish hi at 1500x, 5% iodide at 2000x, or 5% fipronil at 2000x. These biological or chemical controls can help manage pest populations effectively without harming beneficial insects. Tiandy Technologies CO.,LTD , https://en.tiandy.com