What should be noted in summer management of apple trees?
What should be noted in summer management of apple trees? Please introduce the following points to note for apple trees in summer: First, avoid excessive thinning of branches. Excessive thinning of branches easily stimulates dormant medium and short branches to sprout and grow again, and because a large number of leaves are removed, the photosynthetic capacity of the tree is weakened, which is not conducive to nutrient accumulation and flower bud formation...
What should be noted in summer management of apple trees? Please introduce
The following points should be noted for apple trees in summer:
First, avoid excessive thinning of branches. Excessive thinning of branches easily stimulates dormant medium and short branches to sprout and grow again, and because a large number of leaves are removed, the photosynthetic capacity of the tree is weakened, which is not conducive to nutrient accumulation and flower bud formation. The amount of branch thinning should be based on the projected area under the tree, and after thinning the flower shadow coefficient should generally be maintained at about 30%.
Second, avoid unscientific branch bending. Too large a bending angle easily weakens the tree too quickly; too small an angle fails to ease tree vigor and promote short branches. Therefore, methods such as pulling, holding, twisting and stroking should be used to open the base angle and middle angle, keep branches horizontal, and prevent the formation of an "arched back" that causes water sprouts.
Third, avoid twisting shoots in a continuous strip. Twisting all the new shoots on the back of the branch can both affect light and easily lead to an excessive number of branches. For upright new shoots on the back of the branch with space and more than 25 cm in length, twist the shoot at the semi-lignified part at the base (5 cm from the base), and remove the rest.
Fourth, avoid blind heavy cutting back. Excessive cutting back (heavy pinching) will promote branch growth again, affect ventilation and light penetration in the tree, and lead to poor flower formation, so it should be used sparingly. Practice has proved that cutting back (heavy pinching) 2-year-old branches of moderate vigor at the junction of spring and autumn shoots can promote medium and short branches and the formation of flower buds.
Fifth, avoid unchecked girdling. Avoid arbitrary girdling regardless of variety, branch vigor, water and fertilizer conditions, and other factors. The girdling width is generally 1/10 of the diameter of the branch or trunk being girdled, and methods such as wrapping should be used to protect the wound, ensuring that the girdling cut heals in 25-30 days.
Sixth, avoid relaxing pest and disease control. Never think that everything is fine after bagging. Pollution-free pesticides with low residues should be selected to control early defoliation disease, golden leaf miner moth, mites and other pests and diseases. Pay attention to the interval between applications and rotate pesticides.
Click to get more apple tree planting techniques
Click to get more fruit planting techniques