First, fruit thinning techniques: Syrian pear fruit begins one week after the flowering and is completed within one month. Late fruiting is better than early sparse. The amount of fruit should not affect the formation of flower buds in the second year, guarantee the output and quality of the year and not weaken the tree vigor. And there is a certain principle of nutrient reserve, leaving fruit indicators should consider the following factors:
1. According to tree vigor, age, planting density, fertilizer and water conditions, establish the yield per unit area, calculate the average yield per plant, and then set the production according to the tree. Calculate the fruit weight per plant according to the average weight of single fruit 250g-350g, and then The load capacity of each branch allocated fruit set.
2, according to the ratio of 25 ~ 30:1 leaf fruit to determine the amount of fruit left.
3, according to the fruit and fruit ratio of 4:1 decide the amount of fruit left. For young trees, the tree vigor is stronger, and the branch to fruit ratio can be reduced to 2.5 to 3:1. For weak trees and old trees, the ratio of branch to fruit should be appropriately increased to 4.5:1.
According to the reasonable fruit-retention index, in order to ensure the tree's high yield and stable production, the following methods should be used:
1, sparse middle fruit, leaving edge fruit, sparse small fruit, malformed fruit, leaving large fruit, correct fruit.
2, strong branches stay less sparse, weak branches more sparse stay.
3, within the canopy, sparsely sparsely stayed, stayed sparsely and stayed at the middle and outer levels, stayed sparsely and stayed on the crown, and sparsely stayed under the crown.
4, the main lateral branch base and the top of the sparse and stay more, the central sparse and stay more, and ultimately achieve even fruit distribution, sparsely appropriate.
Second, bagging technology:
1, Pear fruit bag selection: Pear Pears best choice of toughness, good permeability of wax bags or sulfuric acid paper bags, bagging the first week with 6% lindane powder 50 times liquid immersed into the bag mouth 1/4 , Drying after use, can reduce the rate of tenebrio meal.
2, bagging period: Pear Pears from mid-May to early June is appropriate.
3, bagging operation technology: After selecting pear fruit, open the paper bag, so that the bag body bulge, and then put the bottom of the bag with a little force upwards and lift it up with a "W" shape, so that the bottom corners on both sides are lower, ventilation The water outlet is slightly opened, and the fruit is put into the bag so that it is suspended in the center of the bag. The bag is held about 2cm below the mouth of the bag. The bag is folded in a “folding†manner from the middle to both sides, and the wire (or iron sheet) is bundled along the bag mouth one week. You can tighten it.
4, after the bagging pest control: After bagging, we must often investigate the damage situation of the tenebrio in the bag, spot check more than 3%, found that 0.3% to 0.5% when the bag has Tenebrio when sprayed 50% anti-influx Super Micro WP 3000 Double or 50% dichlorvos EC 1000 times, wet the bag. If the mealworms are heavy, bags should be taken out of control.
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