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A Detailed Guide to Renewal Methods for Aged Mandarin Orange Trees
For aged trees caused by advanced tree age, overly dense planting, damage from pests and diseases, or poor management, renewal and rejuvenation should be carried out promptly. There are three methods: main branch renewal, skeleton renewal, and rotational renewal. 1. Main branch renewal. This method is suitable for severely declining plants. The method is: at
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Control methods for yellowing disease in citrus cultivation
In many places in our province, citrus yellowing disease occurs commonly in citrus orchards, causing weakened tree vigor, reduced yield, degraded quality, and premature tree decline. Some fruit growers believe it is all citrus greening disease and adopt the practice of cutting down trees, causing unnecessary production losses. In fact, yellowing disease, as long as it is not
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Occurrence Patterns and Control Methods of the Citrus Whitefly
The citrus whitefly, Dialeurodes citri (Ashmead), also known as the citrus whitefly, Tongcao whitefly, and orange-yellow whitefly. In recent years, damage in citrus orchards across the counties (districts) of northwestern Fujian has been extremely severe, spreading from localized outbreaks to contiguous occurrence, with a worsening trend. Adults and nymphs suck plant sap
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What are the care methods for citrus trees after freezing damage
After a citrus tree is damaged by freezing, the aboveground part suffers varying degrees of injury or dieback, while the underground part is generally less damaged. Post-freeze care measures mainly make use of its relatively intact root system to promote the sprouting of new branches, restore the canopy as quickly as possible, and gradually achieve the goal of normal growth and fruiting.
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Key Technical Points for Flower and Fruit Retention in Citrus Cultivation
The 2-3 months from bud emergence to fruit set stabilization is the most important period of the year for citrus trees. For a good harvest, comprehensive flower and fruit retention measures must be taken according to the growth conditions of the citrus trees and changes in weather. 1. Reasonable fertilization: For citrus orchards that were not fertilized last winter, organic fertilizer should be supplemented as soon as possible. For adult trees, apply 5-10 kg of chicken manure or 1-2 loads of farmyard manure per tree, plus an appropriate amount of urea, and bury it around the root zone. The fertilization principle during the flower and fruit retention period is: nitrogen-based in the early stage, emphasis on potassium with phosphorus supplementation in the later stage; combining soil fertilization with foliar feeding. For the post-bloom fertilizer, apply compound fertilizer plus an appropriate amount of urea during the flower-falling period to promptly replenish nutrients consumed during flowering; for the fruit-setting fertilizer, apply potassium fertilizer plus an appropriate amount of phosphorus fertilizer; for the fruit-swelling fertilizer, apply compound fertilizer plus potassium fertilizer. For foliar feeding, spray 0.2% monopotassium phosphate twice from spring bud break to before flowering, spray nucleotides during rainy days, and add 0.1% borax to one of the applications; during the young fruit stage, spray foliar fertilizer 2-3 times in combination with pest and disease control or fruit retention, with the first foliar spray including 0.1% magnesium sulfate and 0.1% zinc sulfate.</p><p>2. Soil management: Repair drainage ditches inside and outside the orchard to remove standing water, so that waterlogging on rainy days does not affect root growth or even cause root rot leading to flower and fruit drop. During continuous dry and hot weather lasting more than 10 days, irrigate promptly to keep the soil moist and loose, which helps the root system absorb water and nutrients.</p><p>3. Scientific use of growth regulators: Plant growth regulators commonly used for citrus fruit retention include 2,4-D, fruit-retention hormone, triacontanol, 920, and fruit-retention agents. Use them 2-3 times after flower drop, spraying once every about 15 days. Alternating different growth regulators gives better results. For seedless and few-seeded citrus varieties, using 920 or triacontanol for fruit retention gives better results.</p><p>4. Pest and disease control: During the flowering and fruiting period, the main pests and diseases include red spider mites, rust mites, aphids, citrus blossom midges, tortrix moths, anthracnose, and scab. For aphid control during the spring shoot stage, use omethoate or monocrotophos; in early to mid-April (or early March if drought occurs), control red spider mites, and in mid-to-late April control rust mites, using acaricides or biological pesticides for spraying; spray organophosphorus pesticides at the early bud stage to kill citrus blossom midges and tortrix moths; for diseases, focus on prevention, using fungicides such as copper oxychloride or thiophanate-methyl.</p><p>5. Control early summer shoots: From May to mid-June, promptly remove early summer shoots to avoid competition between shoots and fruit for nutrients, which benefits young fruit development and reduces fruit drop. For vigorous trees with few flowers and few fruits, girdle the trunk 25 days after flower drop to retain fruit, which can also control summer shoots.</p>
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Five Steps to Take Good Care of Flower and Fruit Retention in Navel Oranges
Navel oranges have excellent quality, are seedless and juicy, and have bright color; they are an excellent citrus variety cultivated competitively by countries around the world. Navel oranges are rich in nutrients and contain various nutritional components essential to the human body. Navel oranges contain large amounts of vitamin C and carotene, which can inhibit the formation of carcinogens,
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Key Techniques for Site Selection, Orchard Establishment, and Fertilizer and Water Management of Navel Orange
Navel orange, original name: sweet orange. Aliases: Huangguoshu, orange, navel orange, fragrant orange, chenggzi. Latin name: Citrus sinensis (L.) Osbeck. Sapindales, Rutaceae, evergreen small tree, branchlets hairless, branch thorns short or absent. Leaves elliptical or ovate, entire or with inconspicuous blunt teeth
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Rational Application Methods and Precautions for Using Biogas Slurry and Biogas Residue Fertilizer on Mandarin Oranges
The peel of the sugar mandarin is orange-yellow and glossy, thin and easy to peel, covered with small sandy dots and somewhat rough to the touch. The fruit is oblate with a protruding knob at the top and a sunken stem-end navel. The flesh is reddish and bright, without white membrane, crisp and juicy, tasting refreshingly sweet with few seeds. Sugar mandarin
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What are the management key points for unrooted hydrangea seedlings?
Hydrangea (scientific name: Hydrangea macrophylla), also known as hydrangea or ajisai, is a plant of the genus Hydrangea in the family Saxifragaceae. The flowers of hydrangea are pure white and full, large and beautiful, and their color can be red or blue, making them pleasing to the eye and refreshing to the mind. It is a common potted ornamental flowering shrub. China cultivated hydrangea
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How to prevent and control hydrangea viral disease? Detailed daily care methods
The hydrangea is native to Japan and the Sichuan area of China. It was introduced to the UK in 1736. In Europe, cultivation is relatively common in the Netherlands, Germany and France, and red, blue, purple and other colored hydrangea varieties can be seen in flower shops. There are also quite a few hydrangeas planted in the ground in small courtyards and in front of buildings. Ger
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