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Detailed Explanation of Key Points for Autumn Pest and Disease Control in Citrus
Autumn is the period when citrus sends out autumn shoots, and also the period of fruit enlargement. Autumn shoots are the fruiting mother branches for bearing trees in the coming year. The quality and quantity of autumn shoots directly affect the yield and quality of the coming year. Therefore, while doing a good job in citrus fertilizer and water management, pest and disease
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Key Points of Summer Citrus Pest and Disease Control Techniques
Summer's high temperature and high humidity make it the season with the highest incidence of citrus pests and diseases in the entire year. If pest and disease control is inadequate during this period, it will seriously affect the cultivation of young citrus branches and shoots, affect the development of young fruit on bearing trees, and even trigger massive fruit drop. Therefore, it is essential to effectively strengthen summer
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Key Technical Points for Citrus Cultivation to Increase Sugar and Reduce Acid
Implementing the citrus "increase sugar and reduce acid" technology is an important measure for creating high-grade branded citrus. Through the promotion and application of "increase sugar and reduce acid" technology, citrus quality can be effectively improved, achieving industrial efficiency and increasing farmers' income. I. Main Technical Measures 1. Promote optimal transformation of citrus orchards. Comprehensively
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Integrated Control Methods for Anthracnose in Citrus Cultivation
After damage, it causes leaf spots, fruit drop, and branch dieback, weakening tree vigor and even killing the entire tree, greatly affecting citrus yield and tree vigor. In particular, the rainy and sunless conditions last autumn caused severe waterlogging in some citrus orchards, poor root growth, and weak tree vigor, which allowed the anthracnose pathogen
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What are the control methods for nutrient deficiency diseases in citrus
Zinc deficiency causes mottled leaf disease. Citrus mottled leaf disease is a common disease, with the typical symptom being mottled small leaves. When new leaves begin to turn green, the main veins and lateral veins appear markedly green, while the remaining tissue is light green to yellowish white and glossy. In severe cases, only the area near the main vein or thick lateral veins is green, and the new leaves are narrow and mottled, mostly upright, with short internodes and clustered branches. Mottled disease is caused by zinc deficiency. Many soils are deficient in zinc, such as soils formed from granite, gneiss, and serpentinite, which contain little zinc; acidic sandy soils lose zinc easily; in alkaline soils zinc readily forms insoluble compounds, thus causing zinc deficiency. In addition, soil that is too dry or too wet, low humus content or excessive application of organic matter, which hinders contact between roots and soil, as well as heavy pruning, all make zinc deficiency likely to occur. Foliar fertilization can achieve fairly good results in controlling zinc deficiency. It is advisable to spray 0.2%-0.3% zinc sulfate solution (with an equal amount of lime) once during the tender shoot stage, and spray 2-3 times for severe zinc deficiency.</p><p></p><p>Copper deficiency or boron deficiency causes dieback disease. In the early stage of copper deficiency in citrus, new shoots are long, soft, and slightly curved, the leaves are large and dark, and fruiting is low, so it is easily mistaken for excessive vigor. In severe cases, the tips of the shoots turn tea-brown and die, short weak clustered branches appear, and they dry out and drop early and gum exudes; when the branches mature, the wounds are reddish brown, and parts of the leaves are reddish brown. Citrus has a very small copper requirement, and ordinary spraying of Bordeaux mixture is already sufficient. However, copper deficiency is likely to occur in peat soil, acidic sandy soil, soil with high organic matter content, as well as on abandoned grazing land and abandoned cemetery land; excessive application of barnyard manure and phosphate fertilizer also causes copper deficiency; newly reclaimed citrus orchards that have not been sprayed with Bordeaux mixture or other copper preparations for several years are prone to copper deficiency. Boron deficiency in citrus: the growing points of buds die continuously, forming clustered buds; leaf veins swell, become corky or split; the fruit is small and deformed, with thick hard peel, and brown resin deposits are present in the fruit center and spongy layer. Boron is easily lost from acidic soil, hence boron deficiency. In soil parent materials such as granite, gneiss, and schist, boron content is extremely low; in alkaline soil its solubility is poor, so boron is also deficient. Excessive application of phosphate fertilizer or lime, or soil drought, all affect the availability of boron and the absorption of boron by roots; sour orange has weak boron uptake, so citrus grafted onto sour orange rootstock is generally deficient in boron. For copper deficiency, Bordeaux mixture or other copper fertilizers can be sprayed. To supplement boron, soil application can be used, or 0.05%-0.1% boron fertilizer solution can be sprayed at the bud stage, flowering stage, and small fruit stage.</p>
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What are the control methods for citrus canker?
Citrus canker Xanthomonas citri (Hasse) Dowson is a bacterial disease that seriously damages citrus, and has been listed as a plant quarantine object at home and abroad. After plants are infected, the tree vigor weakens, and leaves and fruits drop easily; thus reducing yield and affecting fruit quality. Seedlings
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Control Methods for Mango Sooty Mold and Algal Leaf Spot
(1) Mango sooty mold: 1. Symptoms: This disease mainly occurs on leaves and fruit. A layer of black fuzzy material covers the surface of leaves and fruit, resembling soot, hence the name sooty mold. In severe cases, the entire leaf and fruit are covered by mycelium (soot). This type of
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What are the control methods for apple Phytophthora fruit rot?
This spring, the temperature in my area was lower than usual and there was more rain than usual, causing severe outbreaks of apple Phytophthora fruit rot. Apple Phytophthora fruit rot, also known as apple Phytophthora disease, can harm apple fruit; the skin of affected fruit first looks as if scalded by hot water, then turns brown, and the flesh rots. It can also attack the tree
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What are the control methods for apple boron deficiency?
Apple boron deficiency is a physiological disorder caused by boron deficiency, and in the past two years it has shown a worsening trend on early-maturing apple varieties such as American No. 8 and Gala, and late-maturing varieties such as Qinguan. 1. Symptoms: The main symptoms on the fruit can be divided into three types: dry spot type, corky type and rusty spot
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Detailed Explanation of Control Methods for Apple Alternaria Leaf Spot
Apple alternaria leaf spot is an important disease of apple. This disease can cause early defoliation of apple trees, weaken tree vigor, and not only affect the yield of the current year, but also affect flower bud formation and reduce the yield of the following year. 1. Symptoms It mainly damages young leaves, especially young leaves within 20d. Onset
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