What about the yellowing and blackening of sword orchid leaves? the reasons for the yellowing of sword orchid leaves (cutting diseased leaves and spraying)

Sword orchid is a very good indoor flower plant, but if you raise it in the wrong way, the leaves of sword orchid will turn yellow and black. Before we introduced how to raise the sword orchid, how to plant the sword orchid in water, how to plant the ball after the sword orchid blossoms, now let's understand how the sword orchid leaves turn yellow and black and the reason why the sword orchid leaves turn yellow. If the leaves turn yellow or black, it must be the wrong breeding method.

First, the reason for the yellowing of sword orchid leaves is related to the amount of water irrigated by light.

Sword orchid is a kind of potted flower plant which is very easy to raise. Only when the breeding method is wrong can the leaves turn yellow and black. Many people do not know what to do when the leaves of sword orchid turn yellow and black. In fact, a big factor is that there is not enough sunshine or too much watering. Let's first understand the reason why the leaves of sword orchid turn yellow.

1. The light is too strong and too weak

Sword orchid is a plant that likes the sun, but the summer light is too strong, so you shouldn't put it outdoors at this time! Neglect of shading or insufficient shading, resulting in too strong light, resulting in the scorched tip of sword orchid leaves. Orchids in the growth process of excessive shade, light is too weak, long-term shade will also make the sword orchid leaves thin and weak, if suddenly let the orchid see strong light, it is easy to cause the orchid scorched head to shrink leaves.

2. Overwatering

Watering too often causes rotting roots and scorching tips. Spray water in the sun, the water gathers the leaf tip, and the focal tip is illuminated by strong light. The water quality of the watering is polluted, or the orchids exposed to acid rain can also cause scorched leaves.

3. The temperature is too low

Lazy watering caused the plant in the basin to be too dry to meet the water demand of orchid plants, forming empty roots, orchid leaves could not get normal water supply, and sword orchid leaves were scorched due to loss of water. Another point is that the temperature is too low. The yellowing and blackening of sword orchid leaves is closely related to the temperature. If the temperature is too low, it is bound to cause the coke tip of the orchid leaves. The above-mentioned reasons for the yellowing of sword orchid leaves due to natural factors or improper management are usually called physiological focal tips, which are usually black, and there are no black horizontal lines at the pathogeny, so they will not move forward rapidly, and the course of the disease is relatively slow. the harm is not great.

2. Yellowing and blackening of leaves caused by bacteria

1. Bacterial brown spot

The leaf brown spot of sword orchid is caused by bacterial infection, which is the most ferocious scorch tip disease in the orchid leaf disease. it is easy to identify, its disease spot is brown, and its leaves have waterlogged discoloration spots in the early stage of the disease. and quickly pushed forward, resulting in the death of the whole leaf, it is highly contagious, rapid spread and great harm.

2. Anthrax

The anthracnose of sword orchid is caused by fungi, which is the most common scorch tip disease, which is easy to identify. Its remarkable feature is that there are some wavy transverse black belts after the leaf tip is damaged and withered. If the focal tip leaves are cut off, they will continue to move forward if they are not treated. It is a serious scorch tip disease.

3. Black spot

The black spot of sword orchid is caused by fungi and is easy to be identified. its remarkable characteristic is that the disease spot is round, scattered on the leaf surface and leaf edge, and can be linked together in serious cases, resulting in the loss of ornamental value of the whole orchid leaf.

4. Leaf blight

The leaf blight of sword orchid is caused by fungi, which is one of the more ferocious scorch tip diseases, which is easy to identify. Its remarkable characteristic is that in the later stage, the leaf tip turns gray and white, the whole leaf dies, the junction of the diseased leaf is dark brown, and it advances continuously, and even makes the whole leaf dry up rapidly. Great harm. Bacteria will also be the cause of sword orchid leaves yellowing, let's take a look at sword orchid leaves yellow and black how to do, and the solution.

Third, the treatment method of yellowing and blackening of sword orchid leaves

1. The diseased leaves should be cut off: since the leaves have been scorched, they are not enough to be cut off. They must be cut off resolutely, and there is no need for nostalgia at all. Cut off the diseased leaves thoroughly, and the cut mouth should be more than 1 cm away from the diseased spot. If the disease of the old plant is serious, the whole plant can be cut off mercilessly. And sprayed with methyl topiramate. The diseased leaves should be burned or buried deeply after cutting. Never leave the diseased leaves in the sword orchid, and pick up the diseased leaves that fall on the ground in the process of pruning to prevent them from becoming the source of the disease again.

2. Medication should be symptomatic: since the leaves of sword orchid have been scorched, what is the cause? If it is the physiological focus caused by improper management, then strengthen the management of the symptoms. If it is the focal point caused by the disease, it is easy to distinguish whether it is caused by bacteria or fungi, that is, the brown spot caused by bacteria has an obvious symptom: at the beginning of the disease, the spot looks like a waterlogged mark of boiling water. Diseases caused by bacteria can be prevented and treated with agricultural streptomycin and Yekuning, while diseases caused by fungi are treated with methyl topiramate, chlorothalonil, Shigao and other agents. If it is difficult to distinguish what kind of disease it is, the mixture of bactericidal agents and fungicidal agents can also achieve twice the result with half the effort.

3. Treatment should be timely: once the condition is found, it should be treated with medicine in time, and there must be no paralysis thought that the focal tip of the sword orchid leaf has nothing to do with it, let alone the wrong idea that the focal tip of the sword orchid leaf is normal, and the treatment is delayed, resulting in aggravation of the disease and expansion of the scope. It is necessary to clearly realize that the infection rate of sword orchid leaf disease is very fast, although it is not fatal, it loses its ornamental value.

4. Prevention should always be grasped: "Prevention is more important than cure". Prevention work should be carried out unremittingly, liquid medicine should be sprayed regularly, preventive medicine should be used from early spring, and drugs for killing bacteria and fungi should be served together every 10 to 15 days, even if no illness is found, prevention should be taken in the bud, and the disease should be eliminated in the bud.

5. Water spraying should be strictly prohibited: once the focal point caused by germs appears in the orchid leaves, water spraying must be strictly prohibited. Because spraying water will moisten the leaves and accelerate the reproduction of bacteria, at the same time, spraying water will accelerate the spread of bacteria, resulting in malignant spread. If there is too much dust on the leaf surface, which affects the photosynthesis and respiration of the orchid, it can be sprayed together with other fungicides immediately when the leaf surface is dry after spraying water to prevent the spread of bacteria. The above is on the sword orchid leaves yellow and black how to do, sword orchid leaves yellowing of all the reasons, hoping to help everyone.

After the sword orchid blossoms, how to plant the ball, refrigerate the sword orchid seed ball (replant after spring)

Sword orchid is a very suitable for indoor flowers and plants, before we talked about how to raise sword orchid, how to hydroponic culture, when sword orchid blossom and so on, now let's see how to grow balls after flowering. Many friends who have raised sword orchids throw away their bulbs directly after the sword orchids bloom. In fact, sword orchid bulbs can be refrigerated, and they can be taken out and replanted at the beginning of the year.

First, how to plant the ball after the sword orchid blossoms, and then plant it after cold storage

The sword orchid is very beautiful, but no matter how beautiful the flower will wither one day, many people do not know how to plant the ball after the sword orchid blossoms, and some people throw it away directly. In fact, this is not right. We can save the bulbs of sword orchids and plant them until the beginning of spring or when we want to plant them. Refrigerated bulbs can be preserved for a year. Let's take a look at how to refrigerate the bulbs.

1. Dig out the seed ball: the seed ball of sword orchid will have a natural dormancy period of 2 months after falling in autumn. At this time, the seed ball should be preserved to ensure that it can germinate normally after dormancy. Under normal circumstances, as soon as winter is over, the bulbs will be planted and they can germinate in early spring and February. However, the northern area is relatively cold and can be planted from March to April. During this period, attention should be paid to ventilation and dryness.

2. Break off the small ball next to the seed ball: the sword orchid seed ball belongs to the letter ball, and many small balls grow around the big ball. When the seed ball is stored in autumn and winter, the ball can be broken off and planted in spring. Because the corm of sword orchid degenerates relatively quickly, it is rejuvenated mainly by propagating bulbs.

Sword orchid will have 2-3 months of dormancy every year, when the environment is suitable, it will not grow. If you want it to blossom early, it is necessary to break its dormancy period. The bulbs were stored in 0-4 ℃ for 30-50 days or soaked in 39 ℃ water for 2 weeks to break dormancy. Such methods, as long as let the seed ball dormancy early, after planting the seed ball, it will blossom earlier than the ordinary one. How to plant balls after the sword orchid blossoms? now you know! Next, let's take a look at the points for attention in the cold storage of sword orchid bulbs.

2. Matters needing attention in cold storage of sword orchid bulbs

1. Keep it at room temperature: wrap the seed ball directly in a newspaper or net bag and put it in a cool and ventilated corner.

2. Cryopreservation: put the seed balls in the refrigerator and freezer for storage.

3. Try to change the new soil for planting every year. If the open land is maintained, try to change the location. The planting depth should be at least 5cm to 8cm to ensure the healthy development of the new ball.

4. The small balls harvested in autumn will be sown in spring the following year, and new balls can be harvested in October. However, it is best to choose seeds the size of soybeans or peas.

III. Matters needing attention in replanting

Corms should be disinfected before planting. The method is to take out the skin film of the stored seed bulb, soak it in clean water for 15 minutes, soak it in 50% carbendazim 500 times solution for 30 minutes, 50% thiram powder 500 times solution for 10 minutes, take out the corms and pile them together, cover them with plastic film for 1 hour, spread out and dry before planting.

If the soil of gladiolus is dry after planting, irrigation should be carried out to promote the rapid rooting of the corm. The growth period from the 3rd leaf to the 6th ~ 7th leaf is the floret primordium formation stage (3-leaf stage), and it is also the key period when the mother corm root begins to die and the new corm grows new root. special attention should be paid to water supply, combined with soil loosening, weeding and topdressing management.

When does the sword orchid blossom? what if the potted sword orchid does not blossom (the house is full of four seasons)

Sword orchid is a kind of flower plant which is very suitable for indoor culture. Before we introduced the methods and precautions of sword orchid culture and how to cultivate sword orchid in water. Now let's see when the sword orchid blossoms and what to do if the sword orchid does not bloom. If the sword orchid is raised well, the flowers will never be more gorgeous than roses.

When does the sword orchid blossom and bloom all the year round

Sword orchid is a kind of plant that likes light very much. they are afraid of cold, and the low temperature below 0 ℃ is likely to freeze to death, so sunlight and water are indispensable. Many people do not know when the sword orchid will blossom. In fact, potted sword orchids can blossom all the year round. They have different varieties, and the well-raised sword orchids can blossom in 2 months.

Sword orchid florescence: sword orchid can be divided into two varieties: spring flower and summer flower, and the growth cycle of different varieties is different. The early-maturing varieties blossomed at 50,601, 65 and 80 days respectively, and the late-maturing varieties blossomed at 80-120 days. Generally, the flowering period is from May to October, and the flowering is the best from May to June and October. Because the planting season is different, so the flowering season is naturally different.

If it is required to blossom from January to February, it will be planted from October to November. If it is planted in December, it will blossom from March to May. Generally speaking, it takes 100-120 days for the sword orchid to blossom. Some of the natural blossoms are in spring and some are in summer, which are easier to feed. We know when the sword orchid blossoms, and now let's know what to do if the potted sword orchid does not blossom.

2. what if the potted sword orchid does not blossom?

1. Improper breeding

If your sword orchid does not blossom, it must be because of your improper breeding method, either not enough sunshine or insufficient watering. First of all, the bulbs should be disinfected before planting, the method is to remove the skin membrane of the stored bulbs, soak the 15min in clean water, then soak the lOmin with more than 50% Yinling 500 times solution for 30 minutes, take out the accumulation and cover it with plastic film for 1 hour, spread out to dry.

2. Planting

The flower supply in summer can be planted in the open field in spring and in the greenhouse in winter and spring, and the growing period is more than 20-30 days longer than that in summer. In order to prevent lodging and bulb growth, planting should be properly deep, and ropes should be inserted around the planting bed. The planting border has a high 5~1Ocm and a wide lm, and can be used as a flat border in dry areas.

3. Sunshine

Insufficient light during flower bud differentiation will reduce the number of flowers, and after flower bud differentiation, short-day light will contribute to the formation of flower buds and early flowering. Potted sword orchid, mainly phosphorus and potassium fertilizer, can be applied with thin fertilizer and more fertilizer.

What to do after the sword orchid blossoms

After flowering in summer, the residual flowers should be cut off in time, and the management of water and fertilizer should be strengthened so that the nutrition of the aboveground part can be transferred to the ground and the underground corm can be expanded. The corms should be harvested and stored in time after maturing in autumn, dig up the bulbs, remove soil debris, cut off the dry stems and leaves, and store the corms in a cool and ventilated room after drying.

Generally, fully dried corms can be stored at 1: 3 ℃ for 1 year, and they can still germinate normally after winter. The above is the analysis of when the sword orchid blossoms and what to do if the potted sword orchid does not blossom. I hope it can help you all.