The coriander leaves I planted are all wrinkled, what is the reason?

The main reason is that the overall leaf surface is dry and wrinkled caused by frost damage caused by too cold, which is not a big problem. It is not caused by disease, if it is caused by disease, the leaves will be yellowed and have symptoms such as disease spots, and it can be covered with plastic film to prevent freezing and maintain the normal growth of coriander.

Types and causes of leaf shrinkage:

Yellowing: caused by cucumber mosaic virus infection. On the top of the young leaves next to the veins of the small green patches, later expand and turn yellow, the leaves become smaller, and the leaf margins are reversed.

When the disease is severe, in addition to the new leaves, the old leaves also turn yellow and harden. If the disease occurs early, the plant is short. The flowers are deformed, the rate of the melon is very low, the fruit becomes smaller, and the peel appears with flowery and leaf-like markings.

The reticulated fruit of reticulated varieties is uneven. Sometimes the axillary buds germinate, pulling out many branches, making the plant clumped.

Mosaic type: the affected leaves begin to show bright veins, and then lose green and turn yellow between the leaf veins, but the mesophyll tissues on both sides of the main veins and branch veins always remain dark green, forming stripes along the leaf veins with longitudinal green stripes, and the leaves and leaves cause brown round spots, and later they die, and the diseased plants grow slowly, and sometimes the apical necrosis occurs. The other flower leaf type is characterized by irregular rust-colored necrotic spots on melon leaves, and then the leaf veins fade green and gradually show rust-colored necrosis.

Mixed type: caused by a variety of different toxic sources at the same time, the diseased plants are dwarf and shrunken, the leaves are yellowed, the flowers and leaves are deformed, and the plants with severe disease cause death.

Prevention and control plan: Prevention plan: Use 1 bag of Olik 40g + organic silicon or 240ml of pure milk during the common disease period, spray with 15kg of water, and use the drug once every 5-7 days, 2-3 times.

The susceptibility period of plant infection is from seedling stage to flowering stage. Control scheme:

For the first time the virus strain is discovered, use Olik 40g + 1 package of organic silicon or 240ml of pure milk mixed with 15 kg of water to spray the whole plant, use it for 2 days, with an interval of 5 days, and then use it again.

During the growth of coriander, if its leaves appear curled and wilted, it is actually coriander leaf blight.

First: the factors that lead to the occurrence of coriander leaf blight

1. The density of planting coriander is too large.

In the process of planting coriander, the density of coriander planting is too large, resulting in poor ventilation and lighting, and serious diseases. Or use too much nitrogen fertilizer, coriander during the growth process, the stem is very tender, the resistance is reduced, and it is prone to leaf blight.

2. Improper selection of plots and poor field management

Choose soil with heavy stickiness and acidic pH, or plant coriander with heavy crop for many years, resulting in more disease residues in the field. Poor management in the field leads to the growth of weeds, reduced plant resistance, and susceptibility to diseases.

Choosing low-lying terrain, excessive water accumulation, poor drainage, and very moist soil are also prone to leaf blight.

3. Improper use of fertilizer

When planting coriander leaves, the seeds carry diseases. Leaf blight can easily be caused by the application of immature fertilizers or fertilizers with residues of this crop disease.

4. The temperature and humidity are too high in the process of growing coriander in the greenhouse.

In the process of planting coriander in greenhouses, in order to keep warm without letting wind and moisture drain, it will lead to leaf blight due to high temperature and excessive humidity.

Clause.

2. Measures to prevent coriander leaf blight

1.Clean up before sowing.

Before sowing coriander, remove weeds between the planting plot and the plot, concentrate on burning or composting; Deep ploughing of the soil is carried out to remove stubble, dry the land, and allow the leaf blight residue to decompose, so as to prevent and reduce the source of diseases and insects.

2.Choose good seeds.

Choose virus-resistant seeds, use coated seeds, or if uncoated seeds are used, sterilize the seeds with seed mixture or infusion.

3.Choose a good plot.

Choose fields with convenient drainage and irrigation, and leave drainage ditches to reduce the groundwater level, so that there is no stagnant water after the rain stops; It is an important measure to prevent leaf blight and disease by cleaning the field furrow system in time after heavy rain to prevent water retention in the field and reduce the humidity in the field.

For single-incidence areas, chloropicrin can be used, i.e. two to five millimeters of chloropicrin can be applied every thirty-two cm to ten to seventeen cm deep, covered with soil when used, the seedbed is covered with mulch after all use is completed, and the seeds are planted after two weeks.

4.Apply well-rotted organic fertilizer.

Apply well-rotted organic fertilizer, do not use fertilizer with germs. The applied organic fertilizer should be well rotted and must not contain disease residues from this crop.

It may be that the soil has no fertility, there may be a lack of water, there may be a lack of fertilizer, there may be a relatively high temperature, there may be pests and diseases, we must water and fertilize in time, and we should also ensure soil fertility, and use pesticides and fertilizers.

It can be due to malnutrition, it can be caused by too much watering, it can be due to rotting roots, or it can be caused by some disease. It can be controlled by some drugs, and some pesticides can also be used for prevention and control.

The reason why coriander does not sprout may be because the sowing is too deep, the planting time is not right, the best sowing time for coriander should be from September to October, but also pay attention to the treatment of the seeds, if the seeds are not treated, the seeds will not be able to break through the hard shell, then the coriander will not emerge, or the seedlings will emerge more slowly.

This may be due to the lack of timely watering during the planting process, insufficient soil moisture, failure to select high-quality coriander varieties, lack of timely field management after planting, no delivery of soil, and relatively stiff soil.

I think the main reason for the emergence of seedlings may be because the planting time is not right, the seeds are not treated, the sowing is too deep, and the soil is agglomerated to a certain extent.

I think that this situation may be caused by not planting in advance, or the time of sowing is not suitable, and the soil is not loosened regularly, so we should pay attention to prevention and control.

The thin growth of potted coriander may be due to the fact that the soil in which the coriander is planted is not suitable for the growth of the plant, or it may be that the water and nutrients provided to the coriander are insufficient when maintaining it, resulting in poor growth of the coriander, or it may be that the coriander receives too little light in the process of growth, resulting in the inability of the coriander to grow normally, resulting in the phenomenon of long and thin.

1. The soil is unsuitable

The soil for planting coriander is not suitable for plant growth, which will cause the coriander to grow thin, so you need to choose the right soil when planting coriander, coriander is suitable for growing in soil with rich organic matter content and good drainage, so it is best to use fertile and loose sandy loam soil or garden soil with good air permeability to plant coriander.

2. Too little watering

Coriander is suitable for growing in a more humid environment, if the coriander absorbs too little water in the process of growth, there will be a phenomenon of thinning, so in the later maintenance of coriander needs to provide the plant with an appropriate amount of water, soak all the soil, so that the coriander can grow more vigorously.

3. Insufficient nutrients

Coriander will consume a lot of nutrients in the process of growth, but the nutrients provided for it are insufficient when maintaining coriander, which will lead to the growth of coriander, so it is necessary to provide reasonable nutrients for the plant when maintaining coriander in the later stage, improve the growth rate of coriander, and it is best to use nitrogen, phosphorus and potassium compound fertilizer when fertilizing coriander, so that the plant can grow better.

4. Too little light

Coriander is suitable for growing in a sunny environment, insufficient light will cause coriander to grow normally, long and thin, so in the later maintenance of coriander need to provide sufficient light for the plant, so that coriander can photosynthesize normally, and when the light is too strong, it is necessary to shade the coriander in time, so that the plant can grow strongly.

Coriander can be grown all year round, and the key is to sow in autumn and spring. Autumn coriander is often planted in September, spring coriander is generally planted from the end of October to early to mid-November, summer coriander is cultivated in the open field in March and April, and winter coriander will be sown in October. Therefore, it is possible to plant winter coriander now, although it is a little late, and it can be harvested in late November or early December after a month of sowing seeds, and it can be harvested until January of the following year.

If you want to harvest high-quality coriander for a long time, you need to invest time and energy in coriander cultivation technology, especially the sowing and seedling stage of coriander. If the management is not in place, it is very likely to cause uneven budding, and the production and quality of coriander will decrease in both directions. Coriander is actually coriander, and there are pointed leaf species and twig species.

The production volume of sharp-leaved species is relatively high, but the adaptability and aroma are not as good as those of twig species, while the sprig coriander has a strong aroma, low temperature resistance and strong adaptability, but the production volume is low.

There are more small branches of coriander planted in the small vegetable yard of the family, and there are more leaf coriander planted on a large scale in Sun Yat-sen University in Guangzhou, which has a high production volume. Open-field coriander is mainly planted in spring and autumn, and can be planted under maintenance equipment in winter, and in summer, because of the high temperature and rain, it is very rarely cultivated, but it is not impossible to unload planting, but it is necessary to build sunscreen nets and other sunscreen isolation measures. Sowing coriander often occurs uneven budding, which has two conditions, one is that the germination time is inconsistent, some are excavated early and some are unearthed late, and the difference is a long time; Second, the emergence of buds is uneven, some areas produce more seedlings, some areas produce fewer seedlings, or even no seedlings.

Coriander is selected in the live broadcast room, and the sowing method is hole sowing or sowing, and the use of 1 mu is 15 20. The ditch is about 2 deep and 8 rows spacing with flat furrow holes, and the soil is paved and then watered after sowing. When sowing, the furrow is watered with sufficient water first, and after the water seeps in, the furrow surface is sprinkled with 1 layer of sieved soil, and then the seeds are sprinkled to fill the soil.

After sowing, it will not be watered again, and it will be watered again after the seedlings are fully developed. Sowing coriander again, the temperature is high, it is not easy to sprout, cabbage and coriander can be planted, and after the cabbage sprouts, it can have a shading effect on coriander.

Coriander does not sprout, most of the reasons are the wrong planting time, the planting time and planting environment of coriander are high, and it needs to be planted in wet and cold time, generally in early autumn, and it is difficult to emerge if you miss the time.

It may be that the seeds of coriander are not particularly good, the land is too barren, the air permeability of the land is relatively poor, and the watering is relatively small, which will lead to no seedlings.

drug damage, use of hormones, lack of trace elements, affected by the weather; Treat according to the yellowing of the leaves.

Vegetable leaves are yellow, in addition to pesticide damage and vegetable leaves turn yellow, attention should be paid to the following aspects to improve.

1. Increase ground temperature. After watering, the first thing to do is to raise the ground temperature. The temperature of the shed can be increased by 2 3 compared with usual, and the temperature of the shed can be maintained at 29 33 during the day and about 16 at night.

If the temperature is found to be lower than 13 when pulling the shed in the morning, measures such as thickening the straw curtain and covering the thermal insulation quilt and floating film should be taken. In addition, covering straw and rice bran in the operation row is also a good way to ensure a constant ground temperature.

2. Pay attention to the amount of water, time and weather when watering. Due to the low water temperature, watering too much water can easily cause the ground temperature to drop rapidly, and it is easy to hurt the capillary roots, so it is necessary to pay attention to watering small water. Watering time should be reasonable, can not be watered when the shed temperature is high, generally choose before 10 o'clock in the morning, the next day after watering to raise the shed temperature 2 3, in order to promote the ground temperature to rise.

Check the weather forecast before watering to avoid cloudy days after watering.

3. Increase the application of root-raising fertilizers. Fertilizers for rooting and rooting, such as chitin, biological bacteria, etc., can not only promote the growth and nourishment of roots, but also improve the soil aggregate structure, improve the growth environment of roots, and enhance the stress resistance of roots. The root system of pepper is weak and difficult to regenerate, so more attention should be paid to application.

It can significantly enhance the adaptability of vegetable roots and enhance their cold and disease resistance.