From late April to mid-May, the pears fell off one after another, the young fruit began to grow, and the leaves began to grow.
Eliminate the insect fruit. Remove the fruit damaged by the pear heartworm and remove the fruit falling from the weevil. Fertilization, in the second half of May, the amount of nitrogen fertilizer applied for the whole year should be applied 1/3 to 2/3. If there is potassium fertilizer such as grass ash, it can also be applied at this time. After topdressing, water, loose soil and weeding should be applied. Timely thinning and thinning and summer pruning.
On the basis of thinning fruit, the young fruit with thick stem, long fruit shape, and closed end of the scorpion is selected, leaving no diseased fruit, small fruit, deformed fruit, and young fruit that does not protrude. When the pear is set to be fruitful, attention should be paid to selecting the young fruit from which the bracts are shed.
Prevent fruit drop. By early thinning and thinning, topdressing and irrigating, concentrated nutrient supply and retention of young fruit, spraying anti-falling and other comprehensive management measures to prevent "June drop".
Fruit bagging. After the fruit is fixed, the bag should be bagged as soon as possible. The time requirement is to start 15 days after the flower has not yet formed.
Topdressing and watering. This period is the competition period of nut nutrient in pear trees. The requirements for fertilizer and water are high. It is timely to topdress and fertilize water, which is beneficial to prevent the development of fruit drop and young fruit.
Summer trim. Appropriately remove the long branches and competition branches that affect the growth and development of the tree, and ease the tree potential by pulling the branches to improve the flower bud formation.
Beginning in late May, spray urea (0.3% to 0.4%) or potassium dihydrogen phosphate (0.2% to 0.3%), fennel or green wind 95 foliar fertilizer every 15 days or so, continuous spraying 2 to 3 times. According to the weather conditions, it can be irrigated 1 or 2 times, and the ploughed soil after irrigating.
In this period, pear powdery mildew and rust began to be harmful. Pear scab, black spot, round rot, brown spot disease also began to infest; Pear mites first generation eggs and nymphs, pear stem eggs and larvae, and larvae entered In the worst of the season, the orchard is also a favorable period for prevention and control. Other pests such as pear star caterpillar, aphid, heartworm, and pear fruit are all active and need to be controlled. In this period, it is generally necessary to use a mixture of fungicides and insecticides .
In order to reduce the impact on young fruit, it is advisable to use some irritating and high-efficiency fungicides. Generally, the following agents can be used:
70% mancozeb wettable powder 1000～1500 times liquid+50% iprodione wettable powder 1000～1200 times liquid, 70% mancozeb wettable powder 800～1000 times liquid+25% triazolone Wet powder 1000 times liquid spray.
Insecticides can be used: 20% sulphur sulphur emulsifiable concentrate 1500-2000 times liquid, 20% fenpropathrin emulsifiable concentrate 1000-1500 times liquid, 20% methomyl emulsifiable concentrate 1000-2000 times liquid, 25% quetia oxalate emulsifiable concentrate 1000 times solution + 2.5% cyhalothrin emulsifiable concentrate 2000 times solution, 50% thiophosphorus emulsifiable concentrate 1000 times solution, 40% triazophos emulsifiable concentrate 1000 times solution spray.
If a part of young fruit is removed, 25% of the carbaryl WP can be used in combination with insecticide, 600-800 mg/kg + naphthaleneacetic acid 10 mg/kg. During this period, in order to protect the young fruit from the external environmental conditions, it can be used together: seaweed glue 250 times solution, 0.1% silica aqueous solution, 27% non-toxic high-fat film emulsion 200 times solution, 0.3% to 0.5 Spray of % paraffin emulsion.
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