What happened to the loofah planted this year, and suddenly the leaves wilted and had yellow spots?

There are the following reasons for the appearance of yellow spots and wilting on the leaves of loofahs.

1. Dry yellow. The yellow of lack of water is different from the yellow of water, the yellow of lack of water is the withering and dry leaf tips or edges, and the old leaves are withered and yellow from the bottom to the top, but the growth of new leaves is relatively normal. Pay attention to watering when watering enough, water thoroughly.

Second, lack of fat yellow.

It is manifested in the color of young leaves becoming lighter, yellow or light green, while old leaves are more normal or gradually turning from green to yellow. It is necessary to check the potting soil frequently, if there is a dry knot phenomenon, the soil should be replaced, and the thin fertilizer should be applied diligently, and some alum water should be poured in a timely manner to replenish iron.

Third, the lack of light yellow.

If the leaves are shaded for a long time, the leaves will not get enough sunlight to form chlorophyll, and the whole leaves will turn yellow and then fall off, and this disease can be avoided by supplementing light.

Fourth, fat yellow. The yellowing of flowers caused by excessive fertilization or excessive concentration is manifested in dry brown at the top of the new leaves, and the general leaf surface is thick and dull, and the concave and convex are not stretched, and the old leaves are scorched and yellow. Fertilization should be stopped immediately, and part of the fertilizer should be washed with plenty of washing in severe cases.

Fifth, burn yellow. Strong sunlight directly on the leaves is easy to cause the leaf edge to wither, and the sunny part of the leaf appears yellow spots.

Sixth, water yellow. The young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small yellow-green, and the new shoots are shrunk and not long, indicating excessive watering.

Hope it helps.

b has yellow macula, it is yellow leaf disease, you should go to the agricultural material store as soon as possible to get some yellow leaf disease medicine spray.

Potassium deficiency: the tip and edge of the leaf are yellow, and then gradually expand to the mesophyll between the leaf veins, and in severe cases, the leaves are scorched and retracted, the development of the fruit is hindered, and the deformed melon phenomenon such as large head, thin waist, and bending over occurs from time to time. The ratio of nitrogen, phosphorus and potassium requirements for loofah growth can generally be considered as: :

1: Proportional fertilization.

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Calcium: stunted growth of new leaves, incomplete leaf margins, shrunken leaf surfaces, yellow or yellowish-brown patches. The yellowing of new leaves should be related to these reasons.

The ratio of nitrogen, phosphorus and potassium requirements for loofah growth can generally be considered as: 1:, fertilization in proportion.

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Loofah downy mildew:

The diseased leaves first appear irregular pale yellow to bright yellow lesions, and then expand into polygonal yellow-brown lesions, and when wet, a purple-black mold layer appears on the back of the lesions, and in the later stage, the lesions are connected into patches, and the leaves die, and the yield is seriously reduced. Low temperature and rain, high air humidity, large temperature difference between day and night, and poor field drainage are all conducive to the onset of disease. In the field, the fungus spreads through wind and rain.

For the prevention and control of downy mildew, you can choose to use 800 times of 58% Radomir manganese zinc wettable powder, or 600 times of 72% Pulik water solution, or 500 times of 25% Ruifuxin mildew wettable powder spray for prevention and control, once every 7 days, even 2 3 times, the control effect is better.

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Loofah anthracnose:

Ring pattern is the main feature in the later stage of the disease, which is light yellow and nearly round small spots at the beginning of the disease, and then expands to black-brown with wheel pattern. When dry, the lesion** is easy to perforate and break. In severe cases, the leaves die early, causing the plants to wilt and die; The melon vine and petiole are susceptible, the lesions are oval, dark brown and sunken, and when the humidity is high, the lesions overflow with pink mucus.

The pathogenic bacteria overwinter on the diseased remnants with mycelium and conidia discs. For the prevention and treatment of anthracnose, you can choose to use 600 times of 75% chlorothalonil wettable powder, or 800 times of 50% thiophanate-methyl, or 500 times of 60% zeb zinc wettable powder, which can be prevented and controlled every 7 10 days, and 2 3 times in a row, with obvious results.

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Loofah powdery mildew:

It mainly damages leaves, petioles and stems. The front and back of the leaves are initially round or irregular white powder spots and later continuous, the leaves turn yellow, and the leaves wither. In the early stage of the disease, it is not easy to find, and it is difficult to prevent and control after it is severe, which affects the yield.

Prevention and control of powdery mildew. You can choose to use 40% Fuxing EC 8000 times liquid, Yatprazole powder 1500 times liquid, or 20% powder rust Ning EC 1000 times liquid spray control, every 5 7 days for prevention and control, 2 3 times of continuous prevention, the effect is better.

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1. Lack of nutrition.

Reason: The growth of loofah seedlings needs an appropriate amount of fertilizer, to ensure good nutrition in order to promote the growth of robust and vigorous, if the fertilizer is insufficient, lack of potassium, calcium, etc., it will cause the growth of the loofah is not good, resulting in yellow leaves.

Solution: The loofah has a demand for nutrients, so the nutrients can not be missing, mix the base fertilizer in the soil before planting to ensure the basic fertilizer demand, and apply the appropriate amount of compound fertilizer and rotted organic fertilizer in the later stage.

There are two reasons why the leaves of the loofah grown at home are yellow and wilted. The first reason is the lack of inorganic salts, such as nitrogen fertilizer, phosphate fertilizer, etc., and the second reason is the normal phenomenon of normal leaf aging and yellowing.

The reason for the yellowing of the leaves of the loofah.

1. The soil is unsuitable.

The loofah is a common vegetable, if the leaves are yellow when planting, it may be caused by soil discomfort, which will affect the loofah to absorb water and nutrients in the soil, then it needs to be replanted, you can use the garden soil to plant the loofah, so that it can grow well in the soil.

2. Too much water and fertilizer.

The loofah is also very strict with the management of water and fertilizer, if it is given a large amount of watering and fertilizer, it will also affect the growth of the loofah in the soil, which is also one of the reasons why the leaves of the loofah are yellow.

3. Insufficient nutrients.

In fact, the demand for nutrients is relatively large, if the long-term fertilizer is not applied, it is easy to make the loofah lack of potassium, calcium and other nutrients, which will make the leaves of the loofah start to yellow from the edge.

4. Pest and disease hazards.

If the loofah accidentally suffers from downy mildew, anthracnose, red spider and other pests and diseases, its leaves will also begin to yellow, you need to cut off the diseased branches, but also keep the environment ventilated, and spray it with carbendazim, thychalin, dichlorvos, dimethoate and other corresponding pests and diseases.

Basically, it does not open female flowers and does not sit on melons, which reduces the rate of loofah and affects the yield of loofah. If it is due to improper management of farmers, it is very easy to cause premature aging of loofah plants, resulting in yellowing of loofah fruits, falling flowers and fruits. There are also those who are too hard to spray, or affected by pests and diseases, and the leaves are seriously aged early and have poor function.

Physiological problems can only be prevented, not **. It is recommended to apply fertilizer in a balanced manner, emphasizing the use of organic fertilizers and bacterial fertilizers.

In the case of hot and high temperatures, the loofah can easily lead to poor pollination, which is also one of the reasons why the just-knotted loofah turns yellow and falls, the loofah is a kind of medium pollination, in order to pollinate the plant very well, the just knotted loofah will yellow in a few days, fundamentally speaking, it belongs to the physiological disease in the growth process of the loofah. In technical terms, it is a melon. In the common saying of the common people, that is Luohuang.

Melon is also a common physiological phenomenon in loofah planting.

<> loofah is resistant to high temperatures, and the suitable temperature for growth is about 18 degrees to 26 degrees. Among the melons, the loofah is the most resistant to moisture, and the peak fruiting period requires a higher temperature. In summer and autumn, as long as there is no shortage of water and fertilizer, flowering and fruiting are always vigorous.

In arid environments, the loofah fibers are abundant and old. Flourishing: During the growth of the loofah, it is easy to be affected by the environment and improper fertilization to cause the phenomenon of vigorous growth, typical branches and leaves, but it is impossible to sit still the fruit, which is also the loofah will provide nutrients to the branches and leaves, and the nutrients of the fruit can not keep up.

Suspected symptoms of loofah. Turning melons is generally due to inappropriate temperature, insufficient water and fertilizer, excessive amount of nitrogen fertilizer, and many melons. There are also those who are too hard to spray, or affected by pests and diseases, and the leaves are seriously aged early and have poor function.

Physiological problems can only be prevented, may be diseases, remove the yellow leaves. The loofah is not pollinated well and cannot bear the loofah, the soil should be properly loosened, and then watered, to be watered thoroughly. In the future, when planting plants, the soil should add some humus soil and sand, so that the water seepage is good.

The roots are yellow, which may also be dehydrated.

When faced with this situation, it means that the water of the loofah is too small, so the leaves fall off, and it is enough to water a lot every day.

At this time, it is necessary to fertilize more, and reduce the exposure to sunlight, and if appropriate, you can water more.

These loofahs should be given soil change, then the moldy root system should be cut off, and it is better to apply some fertilization.

The yellowing of the leaves is due to a lack of nutrients, and the loofah can be watered with animal manure to allow it to absorb it.

The loofah may be a lack of fertilizer when planting, too much watering, too strong light or infected with a disease, at least twice fertilizer to the melon vine when planting, usually you can water the loofah in accordance with the dry and wet method, when the sun is strong, it is necessary to properly shade the loofah, and once the leaves are found to be abnormal during the planting process, they should be sprayed in time**.

1. Lack of fertilizer

The loofah is a common vegetable in daily life, what is the reason for the yellowing of the loofah after fruiting, when planting the loofah, it is necessary to fertilize the melon vine in time, if the melon vine lacks fertilizer, the loofah will wither yellow after the fruit. When planting loofah, the soil should be fertilized at least twice, the first fertilizer can be applied when the melon vine is flowering, and the compound fertilizer should be topdressed once after the fruit is picked.

2. Overwatering

The loofah has very strict requirements for water, when planting, it is necessary to let the melon vine receive sufficient water and master the amount of watering, too much watering will cause the loofah to wither yellow after fruiting, usually you can water in accordance with the principle of seeing dry and wet, each watering should be watered thoroughly, and the number of watering can be appropriately reduced on rainy days to prevent waterlogging.

3. The light is too strong

Luffa belongs to short-day plants, the early stage of planting should be properly shaded to the loofah seedlings, the later stage can allow the luffa to receive full sunshine, but the sun is strong should also be properly shaded, otherwise it will cause the melon vine to be sunburned, so that the loofah bears fruit after yellowing, it is best to control the temperature at 20 30 degrees when planting the loofah, at this time the loofah grows the best.

4. Infection with diseases

If the loofah vine is infected with the disease, it will lead to yellowing after fruiting, when planting the loofah, we should always pay attention to the changes of the plant, once the abnormality is found, spray the corresponding agent in time**, and cut off the wilted and yellowed branches in time during the planting process, so that the melon vine can absorb sufficient nutrients and produce more fruits.

Summary. Infection with pests and diseases: When the loofah is infected with downy mildew or anthracnose, the leaves of the loofah will also appear yellow and rolled.

The symptom of downy mildew is that the loofah leaves first appear irregular lesions, and then gradually expand, and in severe cases, the lesions will be connected into patches, and finally the leaves will die. The symptoms of anthrax are small yellowish spots on the leaves at first, which later expand to a black-brown color. In severe cases, the leaves will die.

For this pest and disease, we need to prune off the yellowing and infected leaves of the loofah, and then use the symptomatic agent, spray it every 7 days or so, and use it several times in a row to have a significant effect.

Reasons for the yellowing of loofah leaves, what to do if the leaves of the loofah are yellow.

Causes and solutions of yellowing of loofah leaves Improper water and fertilizer: Loofah is a common vegetable in us, if you find that its leaves are yellow, it may be caused by improper water and fertilizer. It is important to know that the water and fertilizer management of loofah is relatively strict.

If a large amount of watering and fertilizing the loofah, it will cause the loofah leaves to turn yellow, at this time you should replace the soil for the loofah in time and prune off the rotten root system to avoid the symptoms of yellowing of the leaves more serious.

Insufficient nutrients: the yellowing of loofah leaves is also related to the lack of nutrients, if the loofah is not fertilized for a long time, the loofah is prone to lack of potassium and calcium and other substances, the specific manifestation is that the loofah leaves begin to yellow from the edge. At this time, we need to fertilize it appropriately, and we can also apply well-rotted organic fertilizer to supplement nutrients.

Infection with pests and diseases: When the loofah is infected with downy mildew or anthracnose, the leaves of the loofah will also appear yellow and rolled. The symptom of downy mildew is that the loofah leaves first appear irregular lesions, and then gradually expand, and in severe cases, the lesions will be connected into patches, and finally the leaves will die.

The symptoms of anthrax are small yellowish spots on the leaves at first, which later expand to a black-brown color. In severe cases, the leaves will die. For this pest and disease, we need to prune off the yellowing and infected leaves of the loofah, and then use the symptomatic agent, spray it every 7 days or so, and use it several times in a row to have a significant effect.

Hope it helps.

I look forward to my ability to help you, I wish you a happy life, if you have no other questions, please end the consultation, give a thumbs up<>

The silk claw leaves to the ridge head are yellow and translucent.

That's the one above.

That's a nutrient deficiency.

How to metallurgize. Insufficient nutrients: the yellowing of loofah leaves is also related to the lack of nutrients, if the loofah is not fertilized for a long time, the loofah is prone to lack of potassium and calcium and other substances, the specific manifestation is that the loofah leaves begin to yellow from the edge.

At this time, we need to fertilize it appropriately, and we can also apply well-rotted organic fertilizer to supplement nutrients.

How to send you a **.

It's just that the nutrients are insufficient.

Because the heads are like this.