How to blacken the leaves of a potted orange tree

Put a little rotten soybean fertilizer on it, and apply thin fertilizer frequently.

Put a little rotten soybean fertilizer on it, and apply thin fertilizer frequently.

1. Habits. Slightly shade-tolerant, prefers warm and humid climate, not cold-tolerant, frost damage occurs when the temperature is lower than -7, and is suitable for growing in deep and fertile neutral to slightly acidic sandy loam soils.

2. How to preserve oranges.

The pulp of oranges can be processed into canned food, candied fruit, jam, fruit cake, jelly, fructose and other shelf-stable products, and can also be made into juice, fruit wine and other beverages.

For 3-7 days, you can dissolve a small amount of baking soda in water to preserve oranges, then soak the oranges in baking soda water, take them out and let them dry naturally, the baking soda will form a protective film on the surface of the oranges, and then put them in a fresh-keeping bag to seal and preserve. Oranges treated in this way can be stored for 1-3 months.

The main ingredient of baking soda is sodium bicarbonate, which, when dissolved in water, makes the water alkaline, which inhibits penicillium and green mold that prefer a slightly acidic environment. At the same time, the alkaline surface also cleans the residual dirt and germs on the surface of the fruit, which indirectly reduces the rot rate. Moreover, during the soaking process, sodium bicarbonate can also react with the fruit acids in the orange peel to produce salt and water.

The water evaporates during the natural air-drying process, and the oranges are less susceptible to decay.

3. Fertilizer and water management.

1) Fertilization principle: The needs of blood orange for various nutrients should be fully met, and more organic fertilizer and rational application of inorganic fertilizer and formula fertilizer should be advocated. Fertilization was guided according to the results of leaf analysis, orchard soil analysis, and phenological period of blood orange.

2) Fertilization method: soil fertilization is the main method, combined with foliar fertilization. Methods such as annular furrow application, strip furrow application, hole application and soil surface fertilization are adopted.

3) Fertilization of young trees: diligent and thin application, mainly nitrogen fertilizer, with the application of phosphorus and potassium fertilizer, fertilization in spring, summer and autumn shoots for 5-6 months, each time each plant is applied ammonium carbide or urea catty. 1-3 year old young trees should be applied with 100-400g of pure nitrogen per plant, and the ratio of nitrogen, phosphorus and potassium should be:

Advisable. Adult trees should be fertilized four times, namely germination fertilizer, fruit preservation fertilizer, fruit strengthening fertilizer, and fruit picking fertilizer.

The amount of fertilizer is generally 2-3 kg of germination fertilizer, and a load of manure water; 1-2 kg of phosphorus and potassium fertilizer + 1 kg of chemical fertilizer; 1-2 kg of fertilizer + 1-2 kg of phosphorus and potassium fertilizer; Fruit fertilizer (base fertilizer) is mainly organic fertilizer, and 50-100 kg of organic fertilizer + 1-2 kg of chemical fertilizer is applied.

4) Water: Irrigate when the soil is dry, and drain water when it is waterlogged.

Oranges prefer acidic soils, and the lack of acidity in the soil will cause the yellow leaves of the orange tree to lose their leaves. You can go to the flower market to buy a bag of ferrous sulfate, use a larger beverage bottle to dissolve, soak until it becomes rust-colored and then dehydrated, Wu listened to the flower merchant's use method, the answer does not matter if it is taken, don't make me sad, the current society is the truth no one believes, just like to be fooled by many people, good people are not good to do.

Summary. This is soot disease, which is caused by a variety of 2113 fungi, with mycelium and closed cyst shell 5261 or conidia overwintering in the diseased part 4102, and 1653 spores scattered by the mold layer in the spring of the following year, spread by wind and rain, poor cultivation, impermeable wind, and high humidity in orchards are conducive to the occurrence of this disease. It is often nourished by the secretions of whiteflies, scales or aphid pests.

Prevention and control methods. 1) Do a good job in the prevention and control of whiteflies, scales and aphids in time (see the pest control section).

2) Do a good job of clearing the garden in winter. To remove the soot disease that has occurred, it can also be sprayed with 200 250 times of dichloride emulsion or engine oil emulsion. Or sprinkle lime powder on the leaf surface to make the mold layer fall off.

3) Prevention and control of the genus should be started at the early stage of the disease. Available 0 5:1:

100 (copper sulfate: lime powder: water) Bordeaux liquid spray, or spray with 70% methyl tobuzine wettable powder 600 l000 times liquid spray, in June and July to spray 1:

4:400 copper soap is sprayed in mid, late June and early July.

4) Prune the orchard so that the orchard is well ventilated and transmitted.

The leaves of the orange tree are black, what's wrong.

This is sooty disease, which is caused by a variety of 2113 fungi, with mycelium and closed cyst shell 5261 or conidia overwintering in the diseased part 4102, and 1653 spores scattered by the mold layer in the spring of the following year, which are spread by wind and rain, and the cultivation of unbalanced, impermeable and humid orchards is conducive to the occurrence of this disease. It is often nourished by the secretions of whiteflies, scales or aphid pests. Control methods (1) timely grasp the control of whiteflies, scales and aphids (see pest control section).

2) Do a good job of clearing the garden in winter. To remove the soot disease that has occurred, it can also be sprayed with 200 250 times of dichloride emulsion or engine oil emulsion. Or sprinkle lime powder on the leaf surface to make the mold layer fall off.

3) The genus of small coal should be prevented and treated at the beginning of spring in the early stage of the disease. Available 0 5:1:

100 (copper sulfate: lime powder: water) Bordeaux liquid spray, or spray with 70% methyl tobuzine wettable powder 600 l000 times liquid spray, in June and July to spray 1:

4:400 copper soap is sprayed in mid, late June and early July. 4) Prune the orchard so that the orchard is well ventilated and transmitted.

Hope it helps.

Summary. Hello, the blackening of the leaves of the orange tree is soot disease, which is caused by a variety of fungi, with mycelium and closed cyst shell or conidia overwintering in the diseased part, and the spores are scattered by the mold layer in the spring of the next year, which is spread by wind and rain, and the orchard is poorly cultivated, impermeable to the wind and humidity, and the disease is conducive to the occurrence of this disease. It is often nourished by the secretions of whiteflies, scales or aphid pests, do you still have any questions that I need to answer for you?

What disease is the orange tree leaves blackening? What kind of medicine should I use?

Hello, Nianzi your problem I have seen Ha Now I am hand-hungry for you to return to the limb content, but it takes a little time, please wait patiently, thank you

Hello, the blackening of the leaves of the orange tree is soot disease, which is caused by a variety of fungi, with mycelium and closed cyst shell or conidia overwintering in the diseased part, and the spores are scattered by the mold layer in the spring of the next year, which is spread by wind and rain, and the orchard is not well cultivated, dense, impermeable, and humid is conducive to the occurrence of this disease. It is often nourished by the secretions of whiteflies, scales, blinds or aphids.

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Black spots on orange tree leaves can be caused by a variety of reasons, including disease, insect infestation, or other environmental factors. Here are some possible causes and how to prevent them:

1.Black Spot: Black spot is a common citrus disease that often manifests as black round spots ranging from 1 to 5 mm in diameter on the leaves.

If it is not controlled in time, it will affect the growth of oranges. It is recommended to carry out pesticide spray control from the bud stage of orange trees to the fruit coloring stage, and pay attention to the regular collection of diseased fruits, leaf bark coarse and gray mucus of diseased trees to prevent the high incidence of diseases.

2.Aphids: Aphids on orange trees can also cause black spots on the leaves, which are the result of damage to the leaves after the aphids have effluent. Aphids can be controlled and cleaned with insecticides and detergents.

3.Light and temperature: Overexposure and high temperatures can also cause black spots on orange tree leaves. Therefore, care should be taken to provide proper shade and cooling for orange trees to prevent excessive sun exposure.

4.Soil problems: Orange trees need to maintain a certain amount of water and nutrients during their growth, and if the soil is not nutrient enough or the soil moisture is too low, it can also lead to black spots on the leaves. Frequent watering and fertilization can be applied to keep the soil moist and nutrient supply.

To sum up, if there are black spots on the leaves of the orange tree, it is necessary to check the specific cause first and take corresponding control measures in time. At the same time, regular pruning and cleaning should be paid attention to in the usual management to maintain the healthy growth of the plants.