What should I do if the watermelon leaves are yellow edged?

In the face of this situation, we must ensure the temperature of planting in time, and it is necessary to water in time, replenish the amount of water in time, and then we also need to prune off these yellow leaves in time.

It is necessary to water in time, fertilize in time, splash some organic fertilizer in time, and also pay attention to controlling light intensity and planting density.

In the later stage, appropriate fertilization, thin fertilizer should be applied frequently, more ventilation, more mineral fertilizer and foliar fertilizer should be applied, crop rotation should be preferred, and microbial agents should be used to slow release and so on.

Part of the leaf edge of the watermelon is yellow, it may be infected with a viral disease, this pest is a bacterial infection pest, and it must be properly treated after it appears. In the early stage of the disease, it is necessary to take medicine, and the drug can choose 1000 times of sodium nitrate phenol and 50 chlorobromoisocyanuric acid. If the condition of pests and diseases is more serious, it is recommended to choose morpholinoguanidine acetate copper and sodium dinitrate once every two days, so that the pests and diseases can be treated.

Watermelon leaves have yellow edges, what causes it? Fertilizer is unreasonable

The yellow leaves of watermelon may be unreasonable in fertilizer, and the increased fertilizer concentration value is too high and the roots are burned. Appropriate microbial agents should be applied as soon as possible, about 20 catties per mu. The ones planted in the greenhouse can not only be flushed, but also need to break the film and ventilate more naturally.

In the middle and late stages, fertilizer should be applied appropriately, and thin fertilizer should be applied diligently to prevent fertilizer damage.

Deficiency

Watermelon can not be replanted, otherwise it is very easy to lead to a lack of nutrients, low potassium, lack of calcium, the leaves are very easy to yellow. Be careful not to re-stubble. In addition to filling chemical fertilizers, it is also necessary to increase mineral fertilizers and leaf fertilizers to fill trace elements for those who have already yellow leaves.

Solution: Immediately fill a small amount of elements (traditional Chinese medicine microbial fertilizer contains a lot of small elements, and carbohydrates, soybean protein and other nutrients required by plants) 100 times diluted leaf spray or root irrigation, spray once every 7-10 days, and continue to spray for 3 days in the early stage.

Root wounds

Root soaking caused by injury or watering caused by the actual operation of farm work will reduce the ability of the root system to digest and absorb nutrients, resulting in yellow edges of leaves.

Solution: It is necessary to immediately use soil-protecting traditional Chinese medicine biological fertilizer, and chemical fertilizers that promote the growth and development of the root system, such as green shengyuan green bag fertilizer, have many effects and outstanding practical effects.

Salt damage

The amount and concentration of soil matter is too high, salinization is more serious, and the root system digests and absorbs many soil solutions with higher concentrations, which will burn the leaf edges and turn yellow.

Solution: Water several times to dilute the amount and concentration of liquid soil layer substances, and then reduce the amount of chemical pesticides used in the whole process of fertilizer use, change to fully water-soluble fertilizer, top dressing biological fertilizer or humic acid fertilizer, etc.

It is likely to be caused by a lack of water, it is likely to be caused by insufficient light, it may be caused by an unsuitable temperature, or it is due to a lack of timely fertilization.

It may be due to long-term watering, which causes the yellowing.

1. Water yellow. Due to long-term watering caused by the yellow leaves, manifested in the young leaves are dull, the old leaves have no obvious changes in the roots are thin, small yellow-green, the tips are not long, should be watered moderately, the heavy ones can be depotted, put in the shade to dry the soil and then re-pot.

Second, dry yellow. Yellowing of leaves due to lack of water or less watering. The old leaves are yellowed and fallen from the bottom up, but the new leaves generally grow normally. The amount of watering and the number of watering times should be appropriately increased.

3. Fat yellow. Due to too much fertilization or too much concentration, the tip of the new leaf appears dry brown, the tip of the old leaf is dry and yellow and falls off, and the general leaf surface is thick and shiny, but most of them are uneven. Fertilizer should be stopped or rinsed with water.

Fourth, lack of fat yellow. Long-term only watering without watering fertilizer, or many years without changing the pot, the roots are clumped, the plant can not get fertilizer, so that the leaves are yellow, in addition to changing the pot, usually should be thin fertilizer diligently.

5 Causes of Watermelon Yellow Leaves:

Timely ventilation, ventilation, foliar spraying of alginic acid and foliar fertilizer;

Select appropriate compound beneficial microbial agents, alginic acid, melt dimel (monosilicic acid), etc., and water them after irrigating the roots or rinse them with water.

The second is to burn the roots with improper fertilizer, resulting in yellow leaves. Prevention and control methods: it is strictly forbidden to apply unrotted manure, it must be fully fermented in advance, and then applied, it can be used to stimulate antibacterial 968 fertility and so on, spray a starter agent every 20-20 cm of manure, mix with an appropriate amount of crushed straw, ferment after irrigation and wetting, turn over the pile in time when the temperature is high, and ferment can be completed in 15-20 days.

or directly sprinkle into the soil and then apply the fermentation agent, and treat it at high temperature for more than 15 days; When applying chemical fertilizers, it is best to take formula fertilization, appropriately increase calcium and magnesium fertilizers, and when using base fertilizers, nitrogen fertilizers should not be too much to prevent root burning; If it is found that the fertilizer burns the roots, it should be irrigated with microbial agents in time, and 5-10 kg of manure starter per mu should be used with water. For the rotten roots and yellow leaves caused by the application of raw manure, the method of breaking the membrane and ventilation should also be adopted to reduce the air damage.

The third is the lack of nutrients that causes yellow leaves. Prevention and control methods:

rational crop rotation; For continuous cropping plots, appropriate medium and trace element mineral fertilizers are used to supplement the deficiency of medium and trace elements while using nitrogen, phosphorus and potassium fertilizers. For watermelon seedlings that have developed symptoms of nutrient deficiency, foliar fertilizer can be sprayed in time, combined with the application of medium and trace element fertilizers, which has a better effect on preventing nutrient deficiency symptoms.

Fourth, soil salt damage causes yellow leaves. Control method: crop rotation and stubble.

It is best to rotate with non-melon crops, especially water-to-dry rotation. Appropriate application of sheep manure and cow manure to reduce the use of chicken and duck manure; Improving the soil with microbial agents, peat, straw, etc., and applying furrow or hole application to watermelon roots can effectively reduce salinity and alkali and promote the growth of watermelon roots.

Fifth, red spider damage causes yellow leaves. Control methods: eradicate weeds around the watermelon field and cut off the source of insects; Spider mites have a short life cycle and strong fecundity, pay attention to early prevention and control, and can use avermectin, spirodifen, ethoxazole, acetazole and other foliar sprays.

Summary. The yellowing of the edges of the leaves of the watermelon may be due to a viral disease.

This disease is a bacterial disease, and it must be treated in time after it is discovered, otherwise the disease will be aggravated and other healthy parts will be infected.

What is the reason for the yellow edge of watermelon seedling leaves?

The yellowing of the edge of the leaves of the watermelon may be infected with a viral disease, which belongs to the bacterial disease of Evoke Chen.

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Look at my watermelon seedlings.

At the beginning of the disease, 1000 times of sodium nitrate phenol and 50 cavities of chlorobromide should be sprayed with dry isocyanurate, and sprayed once every two days. If the disease is severe, copper morpholine guanidine acetate and sodium nitrate should be sprayed so that the plant can be treated.

1. Supplement nutrients: Supplement nitrogen, phosphorus and potassium compound fertilizer for watermelon, and spray Bika foliar fertilizer to the leaves. 2. Dilute concentrated fertilizer:

Fill the watermelon with water and dilute the fertilizer on the roots. 3. Adjust the light: move the watermelon to a position with sufficient astigmatism, and cover it with a shade net when the light is strong.

4. Prevention and control of diseases: After watermelon is infected with diseases, the diseased leaves should be removed immediately and buried deeply.

1. Supplement nutrients

If you forget to fertilize for a long time during the growth of watermelon, it will lead to the lack of nutrients in the seedlings, and the growth will be weakened and the leaves will turn yellow.

2. Dilute concentrated fertilizer:

Applying too concentrated fertilizer to the watermelon, or using organic fertilizer that is not well rotted, will cause the plant to burn the roots due to fertilizer damage, and the leaves will turn yellow.

3. Adjust the lighting

Watermelon lacks sunlight for a long time, it is difficult to synthesize nutrients in the leaves, or after being exposed to strong light, it will cause the leaves to turn yellow.

4. Prevention and control of diseases

The resistance of watermelon is poor, and it is easy to be infected with blight, vine blight, anthracnose and other diseases during the growth period, and the leaves will gradually wilt and turn yellow after infection.

There are many reasons why watermelon leaves turn yellow.

1. Lack of nutrients.

Reason: watermelon seedlings should be paid attention to timely fertilization in the growth, if you forget to fertilize for a long time, it will lead to the lack of nutrients in watermelon seedlings, resulting in weak growth and yellowing of leaves.

Solution: When planting, try not to crop continuously, ensure good nutrients in the soil, timely fertilization to ensure good nutrients, and timely spraying of fertile leaf foliar fertilizer.

Second, the fertilization is too thick.

Reason: The use of a large number of chemical fertilizers, or the use of organic fertilizers that are not well decomposed, will lead to fertilizer damage and high tan burning roots, resulting in yellowing of the leaves of watermelon seedlings.

Solution: It is recommended to pay attention to fertilization at ordinary times, avoid applying thick fertilizer or raw fertilizer, and if Nian Min fertilizes too much, it should be watered and diluted.

3. Improper lighting.

Reason: Lack of sunlight and difficulty in synthesizing nutrients will cause yellowing of leaves, and careless exposure to the sun will also cause yellowing of leaves.

Solution: It should be reasonable to see the light and keep it in sufficient light, but in the middle of summer, the tung must avoid strong light.

Fourth, infected diseases.

Reason: The resistance of watermelon seedlings is very poor, and they are susceptible to some diseases, which affect the leaves and also cause the leaves of the plant to turn yellow.

Solution: Do a good job of prevention before sowing, disinfect the seeds in advance, strengthen ventilation after planting, and spray pesticides in time if it is determined that the disease occurs.