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<\/h3>\n<\/h3>\nSour apple is a variety with large, sweet, crispy fruits, beautiful color, and low susceptibility to pests. It is particularly well-suited to hilly garden soils, drought-resistant, and highly productive under intensive farming. Recently, this variety has become popular and is widely cultivated in the midland and mountainous provinces of Northern Vietnam. The apple trees sold at the center are grafted varieties with large fruits, high yield, and excellent fruit quality. They start bearing fruit 12\u201314 months after planting<\/strong>, and if pruned early, they may fruit even sooner.<\/p>\n Morphological Characteristics:<\/strong> Ecological Characteristics:<\/strong> The best planting season is at the end of the rainy season<\/strong>, ideally from November to December<\/strong>, as the warm weather allows the trees to develop quickly in the following spring.<\/p>\n Planting distance:<\/strong> 4 x 5 meters<\/p>\n<\/li>\n Digging planting holes:<\/strong> 40 x 40 x 40 cm<\/p>\n<\/li>\n Fertilizer application per hole:<\/strong><\/p>\n 5\u201320 kg of decomposed manure<\/strong><\/p>\n<\/li>\n 0.5 kg of superphosphate<\/strong><\/p>\n<\/li>\n 0.3 kg of lime powder<\/strong><\/p>\n<\/li>\n<\/ul>\n<\/li>\n Mix all fertilizers thoroughly with soil and place them in the hole, forming a mound 20 cm above ground level<\/strong> (do not plant trees directly in the fertilizer).<\/p>\n<\/li>\n If manure is unavailable, 5\u20137 kg of bio-phosphate fertilizer<\/strong> can be used per hole.<\/p>\n<\/li>\n<\/ul>\n Watering schedule:<\/strong><\/p>\n First week:<\/strong> Water once daily<\/strong> in the morning or afternoon until the soil is well-moistened.<\/p>\n<\/li>\n Following weeks:<\/strong> Water every 2\u20133 days<\/strong> until the end of the first month. Afterward, watering frequency can be reduced but the soil must remain consistently moist<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Apples require ample water during growth stages, especially before flowering<\/strong>. Drought can lead to smaller fruits, thicker peels, and lower-quality taste<\/strong>.<\/p>\n<\/li>\n Annual fertilization after harvest and pruning:<\/strong><\/p>\n Organic manure:<\/strong> 30\u201350 kg<\/p>\n<\/li>\n Superphosphate:<\/strong> 5\u20138 kg<\/p>\n<\/li>\n Potassium chloride:<\/strong> 3\u20135 kg<\/p>\n<\/li>\n Urea fertilizer:<\/strong> 0.5\u20131 kg<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n Apple fruits grow on new branches from early spring<\/strong>, so pruning is essential to encourage strong branch growth for higher productivity. There are two pruning methods:<\/p>\n Light Pruning:<\/strong> Done annually after harvesting to ensure stable and high yields.<\/p>\n<\/li>\n Heavy Pruning:<\/strong> Applied to young trees (1\u20133 years old) or older trees that need canopy restructuring. All branches are cut, leaving only three strong main branches from the previous year to encourage better fruiting.<\/p>\n<\/li>\n<\/ul>\n Root Rot and Trunk Cracking:<\/strong><\/p>\n Symptoms: Sparse foliage, pale green leaves that fall off, and branches dying from the tip downward. The root system decays, leading to tree death.<\/p>\n<\/li>\n Prevention: Avoid excessive moisture around the roots<\/strong>; monitor for early signs of cracks and blackened wood tissue<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Branch Dieback:<\/strong><\/p>\n Caused by the fungus Colletotrichum cloeosporiodes<\/strong>, which invades branches and causes them to dry out and die. The fungus also attacks mature fruits, leading to rot.<\/p>\n<\/li>\n Prevention: Avoid prolonged direct sunlight exposure<\/strong> and remove infected branches.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Fruit Disease:<\/strong><\/p>\n Fungal infections during fruit development cause small black spots and cross-like scars on the fruit peel<\/strong>, reducing fruit quality and market value.<\/p>\n<\/li>\n Prevention: Maintain good air circulation, remove infected debris, and spray fungicides after fruit setting<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Powdery Mildew on Leaves:<\/strong><\/p>\n This disease is not severe as it mainly occurs when the tree is fruiting, affecting older leaves.<\/p>\n<\/li>\n Best prevention: Graft trees after September and avoid early pruning<\/strong>, as young shoots exposed to temperatures below 20\u00b0C<\/strong> are more susceptible to infection.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Fruit Rot:<\/strong><\/p>\n This disease commonly appears when fruits are nearing ripeness<\/strong>.<\/p>\n<\/li>\n Infected fruits rot rapidly\u2014within one week, an entire tree\u2019s fruit may be affected<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n Root-Damaging Insects:<\/strong><\/p>\n Includes termites, grubs, crickets, ants, and mealybugs, usually found in the 0\u201350 cm soil layer<\/strong>.<\/p>\n<\/li>\n Symptoms: Yellowing leaves, weak tree growth, and eventual tree death.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Stink Bugs:<\/strong><\/p>\n These insects suck sap from young shoots and leaves<\/strong>, causing wilting, deformity, and premature fruit drop.<\/p>\n<\/li>\n Damaged fruits develop black spots, reducing yield and fruit quality<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Branch-Boring Weevils:<\/strong><\/p>\n These pests create small holes in branches and stems<\/strong>, leading to weakened growth and brittle branches.<\/p>\n<\/li>\n They are most active from mid-rainy season to early dry season<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n For sap-sucking insects:<\/strong> Use Sherpa (0.1%), Trebon (0.1\u20130.2%), Depterx (0.2%), Dantinol (0.1\u20130.2%), Monitor (0.1\u20130.2%), Bi58, or B\u00e1udin<\/strong>.<\/p>\n<\/li>\n For leaf-eating insects:<\/strong> Use Azodrin 50DD (0.2%), Score (0.05%), Aliette (0.3%), or Mancozeb (0.25%)<\/strong>.<\/p>\n<\/li>\n For root-damaging pests (termites, ants, beetles):<\/strong> Use B\u00e1udin, Lidanfor, or Sevidol<\/strong>. Mix pesticide with sand in a 1:10 ratio<\/strong> and sprinkle around the base of the tree and planting hole.<\/p>\n<\/li>\n<\/ul>\n Sour apples are harvested 2\u20133 months after flowering<\/strong>, when the fruits are large, firm, and brightly colored<\/strong>. The harvest is done manually, ensuring that fruits are not bruised during transportation<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":" 1. Variety Description Sour apple is a variety with large, sweet, crispy fruits, beautiful color, and low susceptibility to pests. It is particularly well-suited to hilly garden soils, drought-resistant, and highly productive under intensive farming. Recently, this variety has become popular and is widely cultivated in the midland and mountainous provinces of Northern Vietnam. The […]<\/p>\n","protected":false},"author":5,"featured_media":2250,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114,134],"tags":[],"class_list":["post-2249","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fruit-trees","category-techniques-for-planting-and-caring-for-fruit-trees"],"_links":{"self":[{"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/posts\/2249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2249"}],"version-history":[{"count":1,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/posts\/2249\/revisions"}],"predecessor-version":[{"id":2251,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/posts\/2249\/revisions\/2251"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=\/wp\/v2\/media\/2250"}],"wp:attachment":[{"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ifs.edu.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
The tree grows upright or spreads out widely with drooping branches. The branches are twisted and dense. Leaves are alternate, oval or elongated elliptical, 2\u20134 cm long<\/strong>, dark green, glossy on the upper surface, with three distinct longitudinal veins and clearly serrated edges. Flowers are small, have five petals, light yellow<\/strong>, and grow in clusters of 2\u20133 in the leaf axils<\/strong>.<\/p>\n
This tree is easy to grow and adapts well to various soil types. It has high and stable productivity<\/strong> and is not prone to serious pests. If pruned early, it will bear fruit sooner the following year.<\/p>\n2. Planting and Care Techniques<\/h3>\n
Planting Time and Density<\/strong><\/h4>\n
Planting Method and Density<\/strong><\/h4>\n
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Care and Irrigation<\/strong><\/h4>\n
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Pruning Techniques<\/strong><\/h4>\n
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3. Pest and Disease Control<\/h3>\n
Common Diseases<\/strong><\/h4>\n
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Common Pests<\/strong><\/h4>\n
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Control Methods<\/strong><\/h4>\n
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4. Harvesting<\/h3>\n