What to do if the old leaves of kapok are curled and withered

Kapok. The curling of the leaves may be caused by low temperatures, so it can be warmed up and moved to indoor cultivation, or it may be insect pests, sprayed and controlled.

Cultivation of potted kapok.

1. Potting soil: When potting kapok, it is necessary to use high porosity, strong drainage performance and slightly acidic soil, it is best to prepare it yourself, mix it with humus, sand and vegetable garden soil, and then add an appropriate amount of base fertilizer, you can choose Bika water-soluble fertilizer, and pay attention to disinfection treatment after preparation.

2. Light: Kapok likes the sun, and it should be placed in the light during the pot breeding period, so that it can bask in the sun more, and the overall growth of the light will be better. Plants that lack light tend to grow and can also hinder growth.

3. Temperature: The cold resistance of kapok is relatively weak, and the potted plant should be moved indoors in winter, and the minimum indoor temperature should be above 5 degrees, otherwise it is easy to be frostbitten. It is usually best to provide it with a temperature between 20 and 30 degrees.

4. Watering: It has strong drought tolerance and is not resistant to waterlogging. You don't need to water too often during the pot maintenance period, and the soil is better to dry out. Pay attention to the amount of watering, rather dry than wet. In addition, if there is continuous rain, it is necessary to drain the water and avoid stagnant water.

Kapok itself is a deciduous tree species, and it should generally be normal to fall leaves in winter.

Summary. This is cotton Verticillium wilt.

Generally, the peak incidence of Verticillium wilt is in mid to late June, and after mid-August, there are two peak incidence periods. However, if the precipitation is large, the temperature will decrease and there will be acute and sudden diseases, mainly because the precipitation soil moisture is conducive to the rapid reproduction of Verticillium wilt, resulting in the rapid blockage of cotton vascular bundles, a large number of cotton wilting and Verticillium wilt symptoms, and some leaves will fall off or die in large quantities. Some fertilization before and after rain can also aggravate the disease.

What's the deal with cotton leaf curl?

This is cotton verticillium wilt pat, the general peak of verticillium wilt incidence in mid to late June, and after mid-August, two peak incidence periods. However, if the precipitation is too large, the temperature will decrease and there will be acute and sudden diseases, mainly because the precipitation soil moisture is conducive to the rapid reproduction of Verticillium wilt bacteria, resulting in the rapid blockage of cotton vascular bundles, and a large number of cotton wilting and Verticillium wilt symptoms, and some leaves will fall off or die in large quantities. Some fertilization before and after rain can also aggravate the disease.

Now it can be sprayed continuously with methyl tobuzin, difenoconazole, fludienopranazole, benzopropazole and other agents plus brassinin foliar fertilizer, with an interval of seven days. For mild diseases, it can control and alleviate the symptoms. However, if it is a continuous stubble plot, it is necessary to start with planting disease-resistant varieties, do a good job in seed depilation and pesticide dressing, and combine aphids, blind bugs and other pest control before and after the wheat in late May to mid-June to prevent the occurrence of verticillium wilt.

In addition, it is necessary to increase the application of organic fertilizer and potassium fertilizer, which has been proved to be significant for the occurrence control and alleviation of Verticillium wilt, especially in the later stage. And phosphorus and potassium foliar can be added to the foliar surface during the control of diseased worms.

In order to add phosphorus and potassium foliar fertilizers and regulators in pest control. Enhance the disease resistance of cotton.

The leaf curl is not very powerful, not very powerful, first observe for a few days to see.

Could it be a drug hazard?

Observe for a week and see if it doesn't work, spray it and try it.

Summary. 1. Select the right pesticides and use them scientifically. Pyrethrins, emamectin benzoate, chlorantraniliprole, etc.

Mix imidacloprid, acetamiprid, enyldimidamin, pymetrozine, thiamethoxam, halodimidoxapyr, dinotefurin and other agents, plus dichlorvos. Spray control requires a large amount of water to be used to reach the cotton plant, strive to solve the problem with one spraying, and treat other pests.

2. Agent fumigation, in the peak period of aphids, use 80% dichlorvos 6 to 8 taels per mu, add 8 kg of water, and mix 15 kg of wheat bran. Choose windless weather and sprinkle the middle and lower part of the cotton tree in the evening. Be careful not to put the bran on the cotton leaves in a ball to avoid burning the leaves.

The new leaves of cotton are curly, the hair is dry, what's going on.

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1. Infection of pests and diseases: Accompanying viral diseases and aphids will harm the growth of new leaves and make them curl. 2. Lack of nutrition:

The lack of boron, magnesium and zinc leads to the reduction of the efficiency of photosynthetic reeds in new leaves and curling. 3. Low temperature freezing: low temperature frostbite new leaves, which can be bagged to keep warm.

4. Waterlogged roots: The roots of plants are waterlogged and rotten, which affects the nutrient absorption of new leaves.

1. Select the right pesticides and use them scientifically. Use chrysanthemum esters, emamectin benzoate, chlorantraniliprole, etc. Mix imidacloprid, acetamiprid, enyldimidamin, pymetrozine, thiamethoxam, halodimidoxapyr, dinotefurin and other agents, plus dichlorvos.

Spray control requires a large amount of water to be used to reach the cotton plant, strive to solve the problem with one spraying, and treat other pests. 2. Agent fumigation, in the peak period of aphids, use 80% dichlorvos 6 to 8 taels per mu, add 8 kg of water, and mix 15 kg of wheat bran. Choose windless weather and sprinkle the middle and lower part of the cotton tree in the evening.

Note that the wheat bran is not as good as the eggplant and can be put on the cotton leaves in a ball, so as not to burn the leaves.

But it seems that after just taking the medicine of red spider to prevent pests and diseases, it has become like this.

Is the concentration too high? Caused the leaves to burn.

To achieve the removal of red spiders, there are also axiphine and brassin.

Do you have to consider whether it is a drug damage?

Even if there is such a phenomenon on individual leaves, everything else is fine.

That's to blame individual leaves, and if everything else is okay, then don't worry.

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Too dry, improperly watered.

One is too dry, causing the leaves to wilt, and the other is that the water is too much, too noisy, making the leaves wilt and the root system damaged.

1. Silk cotton wood irrigation and top dressing are timely and appropriate irrigation according to soil conditions. Before the true leaves grow in the above-ground part and the seedlings grow rapidly, the water should be properly controlled and the seedlings should be "squatted". Irrigation 2 to 3 times after squatting seedlings, the amount of irrigation in the rainy season depends on the rainfall, reduce the number of irrigation times in the later stage of growth, prevent seedlings from growing in autumn, and irrigate 1 time in early November to prevent cold water.

2. Combined with watering, top dressing can be done 2 to 3 times, and nitrogen fertilizer can be applied in the early stage of seedling growth, so as to promote the top application of phosphorus and potassium fertilizer in the later stage of seedling growth to increase the degree of lignification of seedlings. In the later stage, Ribery Yanwo water-soluble fertilizer can be used for top dressing, which has high absorption and utilization rate and can improve crop disease resistance and stress resistance.

3. Timely cultivation and weeding can prevent weed breeding and soil compaction, and increase soil air permeability. Loosening soil is carried out in combination with weeding, and weeding should be based on the principle of "removing early, removing small, and excepting". After rain and watering, the soil should be loosened in time to protect moisture.

There are five common types of symptoms of cotton wilt according to the period and severity of damage.

1.Yellow reticulation type: the leaf veins turn yellow, the mesophyll part remains green, and the leaves are partially or completely yellow reticulated.

2.Purplish-red type: Cotyledons and true leaves turn purplish-red or appear purplish-red patches with a slight wilt.

3.Yellow-flowered: yellow or yellowish patches appear on cotyledons or true leaves, which gradually turn brown and die.

4.R. wilt: acute loss of water from leaves, wilting and death, sometimes only half of the plant wilt wilting.

5.Shrinkage type: the internodes of the plant are shortened, the plant type is short, and the leaves are dark green and thickened and uneven.

A common feature of blighted plants: the ducts inside the roots and stems turn black-brown.

Prevention and control methods. 1. Before sowing or after harvesting, remove weeds and crop disease residues in the field and around the field, and burn or manure in a centralized manner; Deep ploughing of the ground to eliminate stubble, promote the decomposition of diseased residues, reduce pathogens and insect roots.

2. Rotation with non-undergraduate crops, water and drought rotation is the best.

3. Choose fields with convenient drainage and irrigation, open drainage ditches, reduce groundwater levels, and achieve no stagnant water when the rain stops; After heavy rain, it is an important measure to clean the ditch system in time to prevent moisture retention and reduce the humidity in the field.

4. For fields with many soil pathogens or serious underground pests, the soil should be sprinkled or furrowed with sterilization and insecticidal soil before sowing or transplanting.

5. Select disease-resistant varieties, choose disease-free and coated seeds, and if they are not coated, the seeds must be sterilized with seed dressing agent or soaking agent.

6. Seedling transplanting, covering the seeds with medicinal soil after sowing, and spraying an insecticide and fungicide before transplanting, which is the key to disease prevention.

7. For field seeding, it is necessary to sow early in a timely manner, early seedlings, early soil cultivation, early fertilization, timely soil cultivation, and cultivation of strong seedlings; Spray a mixture of insecticide and sterilization before the seedlings are sealed.

Most flowers grow leaves first and then bloom, but flowers and trees such as plum blossoms, plums, magnolias, spring greetings, forsythia, bauhinia, and kapok bloom first and then grow leaves. Why do these flowers bloom first and then grow leaves? This is because the flower bud differentiation is carried out in the summer of the first year, and the flower buds become dormant after the formation of the primordium in each part of the flower, and can bloom in the spring of the following year.

And because the temperature required for the growth of flower buds of these flowers and trees is lower than that required for the growth of leaf buds, the temperature in early spring has met the needs of their growth, so the base knurling buds gradually expand and open. But at this time, the temperature for the leaf bud, can not meet the needs of its growth, so it is still latent, and when the temperature gradually rises to meet its growth needs, the leaf bud begins to germinate, so the phenomenon of first flowering and then growing leaves appears in the slender stove. If the temperature required for the growth of flower buds and leaf buds is about the same, in spring, the flowers and leaves will open almost at the same time, such as peach blossoms, begonias, etc.

In addition, the origin of kapok is the mountainous area of Panzhihua in Sichuan.