Detailed Explanation of Key Citrus Management Techniques for June
How should citrus be managed in June? Please give an introduction. In June, citrus can be managed by referring to the following methods: (1) Continue fruit retention. The second physiological fruit drop period (also called June drop) begins in mid-to-late May. Unlike the first physiological fruit drop period, the dropped fruit does not have a fruit stalk. For trees whose fruit in the canopy is not obviously different in size and mostly small, in order to reduce fruit drop, foliar topdressing should be strengthened, spraying 0.2% urea plus 0.3% monopotassium phosphate or nutrient solution fertilizer at intervals of about 10 days, and adding 0.2% borax spray in mountain citrus orchards. For young bearing trees and vigorous trees prone to fruit drop, remove summer shoots once every 7-10 days to help retain fruit. In view of the relatively intense competition for nutrients between shoots and fruit, which easily aggravates fruit drop, for vigorous trees that have already undergone girdling (girdling width 2-3 mm), another check should be made before early June, and the healing tissue should be wiped off again from girdling cuts that have healed early.
How should citrus be managed in June? Please give an introduction.
In June, citrus can be managed by referring to the following methods:
(1) Continue fruit retention
The second physiological fruit drop period (also called June drop) begins in mid-to-late May. Unlike the first physiological fruit drop period, the dropped fruit does not have a fruit stalk. For trees whose fruit in the canopy is not obviously different in size and mostly small, in order to reduce fruit drop, foliar topdressing should be strengthened, spraying 0.2% urea plus 0.3% monopotassium phosphate or nutrient solution fertilizer at intervals of about 10 days, and adding 0.2% borax spray in mountain citrus orchards. For young bearing trees and vigorous trees prone to fruit drop, remove summer shoots once every 7-10 days to help retain fruit. In view of the relatively intense competition for nutrients between shoots and fruit, which easily aggravates fruit drop, for vigorous trees that have already undergone girdling (girdling width 2-3 mm), another check should be made before early June, and the healing tissue should be wiped off again from girdling cuts that have healed early.
(2) Tree management
For young trees, pinch off the tips when summer shoots grow to more than 25-30 cm, to promote branching and new shoot growth and expand the canopy. For mature bearing trees, summer shoot emergence and growth should be controlled through fertilizer and water management and bud removal. For old trees, heavily pruned trees, top-grafted trees, and others with exposed trunks and branches, as temperatures rise and sunlight becomes intense, sunburn on trunks and branches is likely to occur, so whitewashing should be applied. The whitewash formula is 500 g quicklime, 15 g sulfur powder, 10 g salt, and 3-4 kg clean water, mixed evenly. After the second physiological fruit drop ends at the end of June, rough fruit thinning can begin. At this time, the transverse diameter of mandarin-type citrus fruit is mostly below 2.5 cm, and thinning is mainly carried out for plants with many fruits. Before starting thinning, first make an overall assessment of the whole orchard, starting with citrus trees bearing too much fruit, and carry out rough thinning first at a leaf-to-fruit ratio of 15:1, removing diseased and insect-damaged fruit, deformed fruit, mechanically damaged fruit, small fruit, and overly dense fruit. During the plum rain season, allow weeds to grow, clear ditches, and prevent water accumulation.
(3) Pest and disease control
At this time, with high temperature and high humidity, citrus rust mites enter a rapid proliferation period, and black spot disease first appears in early June. If there are 1-2 rust mites per field of view under a 10x magnifier on leaves or fruit, or damage symptoms first appear on the undersides of spring leaves, control should begin. You can choose 25%-50% fenbutatin oxide 1500-2000x solution, or 20% carbosulfan 1500x solution, etc., plus mancozeb 600-800x solution to control rust mites and black spot disease, etc. Control black spot disease once more at the end of June to early July. For longhorn beetles, adult insects can be captured, and eggs and larvae removed. When larvae cannot be hooked out, plug the hole with cotton dipped in 80% dichlorvos emulsifiable concentrate or 40% dimethoate emulsifiable concentrate and other undiluted liquids, then seal the outside with sticky mud to fumigate them to death. For scale insects, during the first and second generation hatching periods, choose 99% mineral oil emulsion 200x solution, 25% thiazinone (buprofezin) 1000x solution, and other pesticides for control.
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