What are the key points for the management of oranges in summer?

Citrus fruits belong to the category of high yield, comprehensive nutrition and easy preservation. Citrus tree is also one of the common fruit trees in orchards. In summer, most citrus trees are in summer shoot growth period, fruit rapid expansion period, root growth peak for the second time, fruit setting period. What are the key points of citrus summer management?

1. Continue to do a good job in fruit protection

The second physiological fruit drop of citrus tree is also called June fruit drop. In order to reduce fruit drop, it is necessary to strengthen topdressing outside the root, spray "whole tree fruit"+"Harvey fruit" evenly on the whole tree, and wipe the summer shoots once every 10 days to promote fruit preservation for those strong trees prone to fruit drop.

2. Tree management

Adult fruiting citrus trees need fertilizer and water control and bud wiping to control summer shoot sprouting and growth. The branches of citrus trees with bare branches, such as heavy pruning trees, senescent trees and tall trees, which are easy to be burned by strong light should be painted white to reduce the photothermal effect. For young trees, when the summer shoots are more than 25~30 cm, it is necessary to pick the top to promote branching and shoot to expand the crown.

3. Fruit thinning

At the end of June, the second physiological fruit drop of citrus trees ended and began to be rough. At this time, the fruit transverse diameter is mostly below 2.5 cm, mainly for those citrus fruits, should be carried out according to the leaf-fruit ratio of 15:1 for coarse fruit thinning-thinning out pest fruit, abnormal fruit, mechanical damage fruit, small fruit and over-dense fruit.

4. Apply swelling fruit fertilizer and strong fruit fertilizer

Root topdressing: for plants with too many weak fruits or unstable fruit setting or small fruits, topdressing water and fertilizer: humic acid or amino acid + high potassium type large amount of element water-soluble fertilizer 200 times drenching 1-2 times, as stable fruit fertilizer.

Foliar fertilizer spraying: during the rapid expansion period of young fruits in summer, it mainly supplements medium and trace element fertilizers, such as calcium, magnesium and boron, and biological stimulants, such as amino acids or seaweed extracts, to improve plant resistance, reduce high temperature shedding of young fruits, sunburn, etc. Recommended solution: amino acid calcium or sugar alcohol calcium + amino acid or seaweed.

For plants with ordinary tree vigor, spring shoots not turning green and yellowing, slow expansion of young fruits and serious physiological fruit drop: spray potassium dihydrogen phosphate + brassin + amino acids or seaweed to supplement nutrition, promote fruit expansion and achieve the goal of stabilizing fruits.

5. Prevention and control of pests and diseases

At this time, has entered the plum rain season, high temperature and humidity, citrus rust tick into the rapid proliferation period, black spot disease in early June. 600~800 times solution of lufenuron and mancozeb can be used to control rust tick and black spot disease.

Longicorn can catch adults, cut eggs and larvae, when the hook can not produce larvae, with dipped in 80% dichlorvos or 40% dimethoate emulsifiable solution of cotton plug hole, external seal sticky mud, to achieve the purpose of fumigation death. At the end of June and the first ten days of July, another black spot disease was prevented and treated. Chlorpyrifos was selected for scale control in the first and second generation incubation period.