Apple tree summer tube catch five defense

Summer is the most vigorous growth period of apple trees. It not only increases the long leaves, accumulates nutrients, but also completes the expansion of young fruit and forms flower buds, laying a foundation for high yield in the next year. However, during this period, the weather and climate change are impermanent, and various disasters occur frequently, which often have a greater impact on the high quality and high yield of apples. Production practice shows that in addition to the routine management of apple trees after entering the summer, we should also do a good job of five defenses.

First, prevention and treatment of insects. In the summer, the temperature and humidity are high, and it is most prone to breeding and breeding of various germs and pests. Therefore, it is especially important to grasp the defense of pests and diseases. Its defense measures include: comprehensive drug prevention, manual prevention, and targeted prevention.

Second, anti-fertilization and lack of fertilizer. In summer, the apple tree needs a fat peak. If it is not timely, it will cause de-fertilization and affect the normal development of the tree and young fruit. Therefore, it should be topdressed in time. Usually for general large trees, 50 kg of excrement or urea, superphosphate, potassium sulfate can be applied to each well and mixed into 2 kg at 3:10:5. For fields with significant de-fertilization, it is also possible to spray a 2% aqueous solution of urea in the spray at the time of spraying. At the same time, for apple trees with symptoms of deficiency, targeted remediation should be applied. For fruit trees with calcium deficiency and calcium heart disease, it can be remedy by spraying 2 to 4 times of 0.5% calcium nitrate aqueous solution from the fruit expansion period to 10 weeks or 8 weeks before harvesting.

Third, anti-sunburn. In summer, the temperature is high, the sunshine is strong, and the local temperature of the apple fruit sometimes rises above 45 °C. The symptom is that black spots appear first on the fruit surface, and then gradually enlarge until it rots, which has a great influence on the yield. The defense method is to water or spray water in a timely orchard to reduce the temperature and humidify the high temperature and strong light to directly harm the fruit. Second, white, sticky or bagging the fruit that is prone to sunburn. The whitening agent is made of lime and water at a ratio of 1.5:4. Add a little salt and mix it into a paste.

Fourth, prevent premature aging. Summer is the peak period of apple tree nutrition consumption, often due to insufficient fertility, or premature aging caused by waterlogging disaster. Therefore, in the summer, in addition to timely fertilizer to prevent premature aging, it should also pay attention to anti-staining. Because waterlogging is the main cause of premature aging of apple trees, it is necessary to clear the ditch in time to make the rain dry, the garden does not accumulate water, and the garden soil is dry.

Fifth, prevent wind and hail. The summer weather has a large climate change, which is a frequent occurrence of meteorological disasters such as wind and hail, and should be strengthened. For the hail disaster, the road to group defense should be taken. That is, when there is a hailstorm, the cockroach bombs are fired in advance to eliminate the cockroaches, and remedial measures such as topdressing and watering are taken in time. For gale disasters, methods such as reins and hanging branches should be taken at the appropriate time before the disaster to suppress the wind blowing and blowing off the trunk or branches to reduce the wind hazard.

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