How to manage cherry trees in summer

To do a good job of cherry tree management in summer is the key to realize the yield benefit of cherry tree planting.

First, pull the branch and open the angle

The problems that can not be solved by winter shearing can be solved by pulling branches in summer, so as to reduce the amount of thinning branches. Generally, the branch opening angle is carried out after harvest in June, and the tree response is relatively mild, and it is not easy for branches to appear on the back. the angle of the main branch and side branch should be 60-70 degrees, while the other branches can be pulled to 80-90 degrees.

Second, pick the heart and cut short

For the vigorous growth of the trunk to prolong the branch to pick the heart, not to pick, the competitive branch to pick the heart to control. When the trunk extension branch is 50 cm long, remove the heart and remove 10 cm. When the main branch is 40 cm long, remove 10 cm (leaving buds), and leave 10 cm to pick the heart of the upright branch that grows after coring. From late May to early June, the erect branches or overstrong lateral branches were trimmed (3 large leaves were left at the base to be cut off), and some strong strips could be cut twice in a row.

Third, branch thinning and retraction

Summer branch thinning is usually carried out from late May to early June after fruit harvest (the best thinning is in July). Its purpose is to remove the overlapping, upright, too dense, too strong and seriously affect the light of perennial branches, in order to improve the ventilation and light transmission conditions of the inner chamber of the crown, balance the tree potential, easy to heal the thinning wound after fruit picking, and weaken the tree potential slightly.

Fourth, twist the top and get the branch

Twist the shoot when the new shoot is not lignified from late May to early June, and gently twist the erect branch, competitive branch and introverted temporary branch about 5 cm from the base of the branch, which is beneficial to the formation of flower bud.

5. Proper girdling

Girdling of large cherry trees can promote flower bud formation, improve flower fruit setting rate and fruit quality, but after girdling, the wound heals slowly, and the width of girdling should not exceed 0.5 cm. Because of the different tree potential of big cherries, especially the trees with less organic fertilizer, it is easy to flow glue, so it should be used with caution in production.

VI. Timely watering

Summer drought, it is necessary to pour hard core water, pre-mining water and post-mining water. According to the law of Rain Water in the north, attention should be paid to drought prevention and timely irrigation according to soil moisture in late June, while drainage and waterlogging should be done well in the rainy season from July to August.

VII. Paclobutrazol

For 3-year-old Wangda cherry trees, paclobutrazol was applied in late April and mid-June in Shandong, Henan and other places, with 5 grams per tree. According to the experiment, the effect of applying paclobutrazol in early May is better, most branches are capped in the first and middle of June, and the flowering rate is 95%, while the flowering rate without paclobutrazol is only 20%.

8. Reasonable topdressing

Immediately after fruit harvest, quick-acting fertilizer, preferably compound fertilizer, 0.2-0.3 kg per plant, was applied to promote flower bud differentiation.

IX. Prevention and control of diseases and insect pests

The main diseases and insect pests that harm cherries in summer are gummy disease, mulberry scale, bridge worm and peach leaf moth. Glue disease, in the initial stage of glue flow, use a knife to cut several knives in the diseased spot to extrude juice, and then brush stone sulfur mixture has a certain effect. Mulberry white scale: the damage could be controlled by spraying 48% 1500 times of Lesbon or 1000 times of wax scale in the expansion period of the first generation nymphs in mid-May, and the second generation nymphs were sprayed in the first ten days of July. Bridge worms and peach leaf moths can be sprayed with 2.5% insecticidal EC 3000 times 25% quinathion EC 800 times 1000 times for control.