April and May is a period of vigorous growth of fruit branches and leaves, in which the pear tree fruit begins to swell. As the temperature and relative humidity increase, various diseases and insect pests occur gradually. In this regard, the management at this stage is centered on protecting flowers and fruits, with a focus on the following tasks:
Sparse fruit bagging requires the fruit to be set before mid-May, generally leaving 1 fruit every 20 cm or so to maintain a leaf-fruit ratio of 25 to 30: 1. Pear orchards with low natural pollination and fruit setting rate may not be sparse or sparse. Strive to complete bagging before mid-May. Prior to bagging, focus on spraying the fruit surface with 1 to 2 insecticides and sterilization mixture.
Plastic pruning When the new shoots grow to about 20 cm in early May, the tip is removed 5 to 10 cm to promote the second shoot. For the dorsal branch, topping is done 2 to 3 times, and the resulting shoot group is cultivated. For trees with strong growth potential, the stubby branches occur frequently, and the strong branches can be pulled apart at a 40-degree angle at an appropriate location, which can improve the light of the tree body and slow the growth of the branch tips, which is conducive to the formation of flower buds and beneficial to the results of the following year. The branches are too dense, and upright branches with nowhere to pull can be cut off at the base.
Fertilizer and water management Newly planted young trees and 2 to 3 year old young trees can be applied thinly depending on the weather, using urea, human excrement and compound fertilizer. In the fruiting period, pear trees see the tree vigor and the amount of fruit is 0.2 to 0.3 kg per plant. In combination with the prevention of plant diseases and insect pests, 0.3% urea and 0.2% potassium dihydrogen phosphate are sprayed on the canopy every 15 days or so. In case of drought, water should be poured once to meet the fruit's demand for water.
Pest rust prevention and control: 2500 times solution of 10% difenoconazole water granules, or 3000 times solution of 12.5% ​​tebuconazole wettable powder, etc., spray control, can also cure black spot disease and ring vein disease.
Pear brown spot: 800% solution of 70% thiophanate-methyl wettable powder, or 600% solution of 50% carbendazim WP, spray control.
Pear lice, aphids: 1.2% matrine and nicotine EC 600-800 times solution, or 10% imidacloprid wettable powder 2000 times solution, etc., spray control.
Pear gall midge: spraying 50% phoxim emulsifiable concentrate 1000 times on soil surface.
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