Doing a good job of pear tree bagging before and after the management is a key link in the production of high-quality, non-pollution fruit. Focus on the following points:
I. Pest control
1. pear hibiscus. To spray 80% of pears, spray the first dose, spray the second dose before bagging, and spray the third dose 7-10 days after bagging. The agent can choose bright pear glycoside (avermectin + spirotetracycline) 2000-3000 times, or 1.8% abamectin 3000-4000 times.
2. Tenebrio. Red storm (10% imidacloprid) 2000-3000 times solution, or 5% acetamiprid 4000-5000 times solution, or Hanbang beta cypermethrin 1500 times solution can be used for both treatment of green locust.
3. Cornell mealworms. After bagging, it was treated with 48% chlorpyrifos 1500-2000 times. It is forbidden to use organophosphorus pesticides after flowering and before bagging. Sprayer spray atomization is better, to prevent damage to young fruit, resulting in rough fruit or fruit rust.
4. Scabs, black spots. After the flower is dropped, before the bagging, these two times can be used with Kai Tai (Difenoconazole + Pyraclostrobin) 4000-6000 times, or 80% Carbendazim 2000 times, or Taicang (28% Jingganga Ling) 1200 times liquid for prevention. When spraying carbendazim, spray in strict accordance with the prescribed concentration, do not blindly increase the amount of medication in order to avoid safflower disease. After bagging, 10% difenoconazole 3000-4000 times solution can be sprayed for prevention and treatment.
Second, fruit thinning
Timely fruit thinning can reduce the nutrient loss of fruit trees, and should be used for fruit thinning when the size of the fruit is like a bean. How much fruit should be retained according to the tree potential strong and reasonable load, leaving the fruit density generally grasp every 40 leaves to leave a fruit, fruit spacing should be 15-20 cm. The circumference of the canopy is airy and light-transmitting, and the density of the fruit can be dense enough.
Third, bagging
Pear fruit bagging can improve the quality of fruit and reduce pests and diseases. Fruit bag selection should focus on quality. The outer layer of the three-layer bag is better in waterproofness. The density of the black bag in the inner layer is higher. It must have a pulling force, good shading, and no fading. Plastic bags must be breathable. The bagging time will be between late April and mid-May and will be completed by May 25 at the latest. When bagging, the bag should be blown open so that the pear fruit can be placed in the center of the bag and the bag can be tied to prevent pests from getting into the bag.
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