How can apple pest control after bagging be more scientific and effective?
After bagging, it's crucial to understand the types of pests and diseases that may affect the apples. Many growers mistakenly believe that once the fruit is bagged, it's completely protected. However, this isn't the case. Even with bags, certain pests and diseases can still develop. Experts remind farmers not to become complacent—this is a critical time for monitoring and managing potential threats.
Common pests and diseases that appear after bagging include brown spot disease, black spot disease, red spot disease, apple leaf roller moth, gold thread moth, red spider mites, peach borer, beetles, and yellowing (jaundice). Each of these requires specific attention and treatment strategies.
For brown spot disease, early symptoms include round, magnolia-like, or mixed lesions on leaves. These spots eventually lead to defoliation if left unchecked. The disease thrives in high humidity and warm temperatures, especially when orchards are overcrowded or spraying practices are inadequate. To manage it, mix Polaroid with Tianda 2116 at 6000 times dilution, which improves coverage and prevents leaf drop.
Black spot and red spot diseases have different causes and symptoms. Black spot typically appears as small, dark, needle-like spots on the fruit surface, often caused by fungal infections like pink trichothecium or fusarium, or due to calcium and boron deficiencies. Red spot, on the other hand, occurs mainly after bag removal, showing small red spots on sun-exposed areas, caused by bacterial infections.
To prevent black spot, apply 80% mancozeb at 800 times dilution before bagging, along with 3.0% polyoxin. Also, treat mealybugs using 20% acetamiprid WP at 1500 times or 99.1% insecticide at 400 times. Spraying calcium and boron solutions before bagging can also reduce incidence.
For red spot, use 3.0% polyoxin or 10% polaroid at 1000 times dilution. Mix with Tianda 2116 at 1000 times for better results and protection against sunburn.
Red spider mites require timely and repeated spraying. Use 2% avermectin with a surfactant or combine it with diflubenzuron. Adding Tianda silicone at 6000 times helps penetrate the mites’ waxy layer, reducing the need for reapplication after rain.
For pests like peach borer and beetles, pheromone traps and light traps are effective. Pheromone lures attract adult moths, while light traps catch them. Biological methods, such as hanging watermelon rinds with Wan Ling powder, can also help control pests naturally.
Sex attractants and light traps are key tools in modern, eco-friendly pest management. They reduce pesticide use and support pollution-free fruit production.
Apple yellow husk, caused by aphids, leads to mosaic patterns on leaves and affects growth. Control measures include applying oil emulsions in winter, followed by insecticides like 3% acetamiprid or 20% chlorpyrifos. Protecting natural predators like ladybugs and lacewings is also important.
All treatments should be mixed with organic silicon at 6000 times dilution to enhance effectiveness, save labor, and avoid re-spraying after rain. By adopting these scientific and environmentally friendly methods, farmers can ensure healthier, higher-quality apple crops.
Animal Feed Protein Powder,Animal Feed Probotics,Insoluble Water Powder,Bacillus Subtilis Probiotic Feed
CANGZHOU HUAYOU IMPORT & EXPORT TRADE CO., LTD. , https://www.huayoutrade.com