It is understood that summer pruning can lay the foundation for increasing production and can control prosperity. The summer pruning methods of pear trees mainly include pulling branches, opening angles, sparse branches, wiping buds and topping.
1. Open the corner
Opening angle pruning is to adjust the paper strips by pulling branches to distribute excess paper strips in the tree to make them evenly distributed, increase space, and improve ventilation and light transmission conditions. Opening angles of the branch facilitate flower bud differentiation and early results. Pulling branches are generally carried out in the first half of June, when the growth of spring shoots slows down or stops growing. Pulling and falling branches are adopted for overly upright branches to ease their growth and promote flower buds. Chinese medicine measures for tree pruning in summer.
2. Sparse shoots
Thinning and sprouting refers to cutting (wiping) the dense paper strip from the base during the growing season. Pear trees have a high budding rate and weak branches, and the crowns are mostly sparse. Therefore, more branches and fewer branches are needed. The opening angle of the long-twisted branches is used to ease the growth, and the use of retraction and pruning methods is very beneficial for early results.
3. Topping
Topping is when the new shoots grow to a certain length and the top 1-2 leaves are removed. Different periods of topping will have different effects. For example, the vigorous young trees will be topped when the new shoots grow to 30-40 cm from late May to early June, which can promote the growth of the secondary shoots, accelerate the shaping, reduce the amount of pruning, and ease the tree Momentum to lay the foundation for early results. In August, topping the new shoots before they stop growing can promote the full development of the new shoots, which is conducive to safe wintering. In order to promote the new shoots to germinate the secondary branches as soon as possible, you can remove the 1 ~ 2 leaves of the wound while the new shoots are topping, so that the axillary buds can germinate quickly and the secondary branches can be quickly drawn.
Pear tree topping should be timely. If the topping is too early, it will stimulate a large number of useless accessory shoots and consume nutrients; if the topping is too late, the expected effect will not be achieved.
4. Adjust the branch angle
Pear branches are upright and brittle, and are not easy to open. Bone branches are more open after the fruiting period, and the branches are prone to sag. Therefore, the crown of the young trees of most pear varieties is conical, which affects the early flowering and fruiting. It is necessary to open the main branch angle early. However, due to the strong trunk of pears and the large opening angle, it is easy to concentrate the growth advantage on the middle stem, and the growth of the extended branches is weakened. Therefore, the main branch angle of pear trees should be smaller than that of apple trees. Between 45 ° and 55 °, the maximum shall not exceed 60 °. The methods of opening the angle mainly include pulling, bracing, falling and tying. As the age of the tree increases and the yield increases year by year, the canopy gradually opens. In the later stages of Dashengguo, the angle of the main branch increases, and its tip is prone to sag, and it needs to be retracted and trimmed too high.
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