What kind of medicine does coriander seedling yellow leaf take? What medicine is used for coriander

What kind of medicine does coriander seedling yellow leaf take? First of all, it should be explained that once the yellow leaves of vegetables, not all phenomena can be solved by spraying, and different methods should be taken to solve the yellow leaves caused by different reasons, and some problems can not be solved by pesticides. The young and tender seedlings of coriander and the yellow leaves are not in addition, but also to analyze the reasons first, and then find the correct solution to solve it.

First, the young seedlings of coriander are yellowed due to disease. This phenomenon may be a root disease or a yellow leaf phenomenon caused by leaf disease, and carbendazim can be used.

Oxazalin, mancozeb.

or methyl tobuzin.

Foliar spray that can relieve symptoms very quickly.

Thirdly, the young seedlings of coriander were defertilized due to the low nitrogen content of the base fertilizer. The solution is through topdressing of fast-acting nitrogen fertilizers, such as thin urea.

Quick-acting water-soluble fertilizer watering such as water or human feces and urine can be solved quickly.

Fourth, the main reason for the damage of young coriander seedlings due to underground pests. Coriander seedlings, fleshy roots, easy to provoke underground pests, bite off the root system, yellow leaves phenomenon, can use phosphine.

Or trichlorfon agent mixed with poisonous soil evenly sprinkled on the furrowed ground, has a very good control effect.

Fifth, the yellow leaf phenomenon caused by the improper use of pesticides and fertilizers in young coriander seedlings. Coriander seedlings have yellow leaves due to the influence of fertilization or pesticide residues on the stubble, and urea and potassium dihydrogen phosphate can be used.

Foliar spray of a mixed solution of brassinolide or gibberellin can provide relief.

Seventh, coriander seedlings are very hardened due to soil acidification. Soil acidification, so that the soil compaction, poor air permeability, coriander seedlings appear yellow leaves, can be increased by the application of plant ash.

Neutralizing soil acidity, combined with cultivating loose soil, and improving soil ventilation and ventilation can be alleviated.

In short, the phenomenon of yellow leaves of coriander seedlings is not only a disease, there are many reasons, which can make the seedling leaves yellow, and it is necessary to have specific reasons, specific analysis, find a suitable way to solve the problem, and solve it in order to achieve better results.

Gibberellin was suggested to play an important role in regulating seed germination, leaf extension, stem and root elongation, and flower and fruit development.

Cause coriander seedlings yellow leaf phenomenon, not only disease, there are many reasons, can make the seedling leaves yellow, to specific reasons, specific analysis, find a suitable way to solve the problem, to solve the problem, in order to achieve better results.

Coriander can be said to be a "lazy dish", just like planting onions and garlic, there is no need to worry about pests, and it is very easy to grow. If we encounter yellow leaves, we can also take foliar fertilizer spraying to remedy it. Foliar fertilizers such as amino acids, brassin, and potassium dihydrogen phosphate can be sprayed.

There is a foliar multi-element foliar fertilizer that you can try, it contains amino acids nitrogen, phosphorus and potassium, which can make the leaves yellowed leafy vegetables turn green and oily for a short time.

If the leaves of coriander seedlings are yellow due to illness, carbendazim, oxazin, mancozeb or methyl tobuzine foliar spray can be used to quickly relieve the symptoms. If the sowing density of coriander is too large, the seedlings grow too densely, and the ventilation and ventilation ability is poor, the yellow leaves can be gradually alleviated by reasonable thinning of the seedlings, enhancing the gap between the plants, improving the ventilation and ventilation of coriander seedlings, and topdressing thin human feces or urea solution.

There are many reasons for the yellow leaves of coriander seedlings, and it is not necessary to apply medicine to treat them.

First, the temperature is too high.

1. Reason: Coriander is not resistant to high temperatures, and once the temperature exceeds 20 degrees, the coriander will grow very slowly. If the temperature reaches 30 degrees, the coriander will stop growing, and it will also cause the coriander leaves to turn yellow and white.

2. Treatment method: If the temperature is too high, make some temperature adjustments, and then reduce the temperature to the temperature suitable for the growth of coriander as soon as possible, about 18 degrees.

2. Excessive fertilization.

1. Reason: The base fertilizer has not been fermented and rotted, which produces a lot of heat, or there is too much compound fertilizer, and then there is a phenomenon of burning roots, resulting in yellow and white coriander leaves.

2. Treatment method: Fertilizer should be stopped first, and then water should be poured into the soil, so that the excess fertilizer can be discharged out of the basin with the water flow. Don't fertilize too much in the later stage, just a moderate amount.

3. Occurrence of insect infestation.

1. Reason: Coriander can also have pests and diseases, such as red spiders. Spider mites will suck the sap of coriander on the back of the coriander leaves, causing the entire leaf to turn yellow and white.

2. Treatment method: Usually you can spray more Bika foliar fertilizer to increase the resistance of coriander. After the insects are born, they need to be sprayed with chemical insecticides**.

Summary. Coriander blight, also known as dead seedling disease, mostly occurs in the middle and late stages of coriander seedlings, and is related to factors such as high humidity, so moisture should be drained when planting, spraying R. solanacearum before and after the onset of the disease, which can play a preventive and leading role, if the disease is serious, the dosage can be increased appropriately. Spraying R. solanacearum before and after the onset of the disease can play a preventive and ** role.

1. Dilute R. solanacearum rik by 600 times, 3 liters per square meter and water the seedbed before or after sowing and before planting. 2. Irrigate the roots or flood irrigation of a small area of the diseased plants and the plants within 2 3 meters around the diseased plants; If the pathogen is harmful to the aboveground parts at the same time, the aboveground parts should be sprayed at the same time as the root irrigation, and the medicine should be applied once every 5 days.

Coriander blight, also known as dead seedling disease, mostly occurs in the middle and late stages of coriander seedlings, and is related to factors such as high humidity, so it should be drained when planting, spraying R. solanacearum before and after the onset of the disease, which can play a preventive and leading role, if the disease is serious, the dosage can be increased appropriately. Spraying R. solanacearum before and after the onset of the disease can play a preventive and ** role. 1. Dilute R. solanacearum rik by 600 times, 3 liters per square meter and water the seedbed before or after sowing and before planting.

2. Irrigate the roots or flood irrigation of a small area of the diseased plants and the 2 3 meters around the diseased plants; If the pathogen of Huinaliang is harmful to the aboveground parts at the same time, the aboveground parts should be sprayed at the same time as the root is irrigated, and the medicine should be applied once every 5 days.

2.After emergence to the early stage of the disease, the following fungicides can be used for prevention and control: 800-1000 times of 20% rusticide suspension and 600-800 times of 70% mancozeb wettable powder; 20% fluoramide wettable powder 600-800 times liquid dissipation; 400-600 times of 30% malignant nail cream aqueous agent; 20% methyl standing blind residual phosphate milk 800-1200 times liquid; Spray the plants with water once every 5-7 days.

Coriander is a kind of edible and medicinal plant, in our life is mostly used for seasoning, although its special fragrance is unacceptable to many people, but there is still no shortage of people who love it, and the market demand is considerable. In the process of growing coriander, we sometimes encounter the phenomenon of yellow or whitish leaves of coriander, which has a great impact on the quality. So why is this happening?

And how to solve it? Let's take a look.

1. The temperature is too high.

The temperature suitable for the growth of coriander is 18 degrees Celsius, and once the temperature exceeds 20 degrees, the coriander will grow very slowly. If the temperature reaches 30 degrees, the coriander production stops. If the temperature is too high, the coriander will grow slowly, and it will also cause the coriander leaves to turn yellow and white.

Solution: If the temperature is too high, make some temperature adjustments, and then lower the temperature to the temperature suitable for the growth of coriander as soon as possible.

2. Heavy crop planting.

Coriander cannot be planted in duplicate, if you plant coriander continuously in a field, the roots of coriander will become weak and short, and the coriander tree will become thin and short. The roots have poor absorption capacity, and if there is not enough nutrients to supply the leaves of the coriander, the leaves of the coriander will turn yellow or whitish.

3. Caused by insect pests.

Coriander can also have pests and diseases, such as spider mite. Spider mites will suck the sap of coriander on the back of the coriander leaves, and some white spots will appear on the surface of the leaves. In severe cases, the leaves will turn yellow, and photosynthesis will also be affected, causing the entire leaf to turn yellow and white.

Solution: Once the spider mites are found, spray pesticides in time for control. Usually spray some foliar fertilizer and some avermectin on the foliar surface, which can increase the disease resistance of coriander and reduce the harm of insect pests.

4. Apply too much fertilizer.

Before planting coriander, the bottom fertilizer is manure, which has not been fermented and rotted. Or there is too much compound fertilizer, and then there is a phenomenon of burning roots, causing the coriander leaves to turn yellow and white. The manure generates a lot of heat in the process of rotting, and the phenomenon of root burning occurs.

Or there is too much compound fertilizer, and there will also be root burning.

Solution: Farm manure must be fermented before it can go up to the ground. If you apply compound fertilizer, don't apply too much, just an appropriate amount.

The above is the cause and solution of yellow and white coriander leaves, which is mainly caused by improper management in our planting process, so in order to ensure the planting efficiency, we must provide it with a favorable environment and conditions for growth, in order to obtain better yield and quality.

It is best to use plant-specific insecticides, evenly spray on plant leaves, and should not be watered during the medication, otherwise there will be no effect. It can be consolidated a few more times.