What causes yellowing of domesticated cucumber leaves? What should I do?

Cucumber as a daily vegetable, now in midsummer, the consumption of cucumber has also begun to increase, its nutrition is rich, with heat and detoxification, intestines and lungs, beauty and other effects, deeply loved by people. What's wrong with cucumber leaves turning yellow?

There are four diseases that cause yellowing of cucumber leaves: cucumber oval spot, bacterial horn spot, downy mildew, and anthracnose, all of which can cause yellowing of cucumber leaves. But from the description of the subject, the yellowing of the front leaves of cucumbers, and the sending of ** (only the picture above), it can be known that only cucumber downy mildew has a high chance of occurring, and nothing else is not. Cucumber stem elk leaf spot has yellow spots, but the leaves are concave and convex, rough, and inconsistent with **; Bacterial horn spot disease forms white spots on the dorsal and white pus of the leaves; Anthrax leaves also have flesh-red mounds of elk, so these three symptoms can be ruled out from the appearance of the leaves.

Symptoms of cucumber downy mildew: the leaves have yellow spots, and the arrangement is irregular, the front of the leaves is green and yellow, the junction of the disease is blurred, the junction of the disease is clear on the back of the leaf, and there is a small amount of mold layer on the front of the leaf when wet. With the development of the disease, the leaves will soon be all yellow and dry, and seriously spread to the whole field, constantly curling and yellowing, resulting in reduced yield.

Cucumber downy mildew control measures: first disinfect the seeds with excellent disease resistance, and use 50% Dover + 70% methyl tobulin wettable powder 1:1 mixed seeds, the dosage is seeds, soak them in warm water at a constant temperature for 20 minutes before mixing the seeds, and then soak them coldly for about 3 hours; Rational fertilization to improve plant growth and disease resistance; Early onset can be done with chlorothalonil 75%.

Early onset can be prevented by spraying a 75% chlorothalonil wettable powder dilution solution.

Now that we already know that it is a low-sugar disease, we can increase the sugar content of the leaves by supplementing with sugar properly, usually we choose brown sugar and glucose. If it is used well, it can prevent diseases and increase production. Here are a few tips for your family to use:

Formulation.

1. Urea + glucose

This formula is mainly used to prevent gray mold and downy mildew, and the specific use method: mix 1:2 to make a preparation solution, and spray it with water.

Formulation.

2. Sugar + urea + water

This formula is mainly used to prevent downy mildew, and the specific use is: 1:1:

100 proportions of mixed spraying. Spraying 1 time every 7 days, 3-5 times in a row, can effectively prevent downy mildew. However, please note that you should not choose to spray at the high temperature time in the middle of the day, as the high temperature of urea will burn the leaves and cause fertilizer damage.

It is best to choose to spray before 10:00 a.m. or after 4:00 p.m., the effect is good.

It may be that too much sunlight causes water loss, coupled with nutrient deficiency, or it is caused by pests and diseases, you can reduce the light first, water more and fertilize more, or you can properly supplement some nutrients, which may be improved.

It is because cucumbers lack potassium fertilizer, and cucumbers are very short of water, and the sunshine time of cucumbers is not enough, and they have not found a suitable living environment. If you want to solve this problem, then you should water the cucumber immediately, fertilize the cucumber, and then put the cucumber in a sunny place.

It may be because of improper fertilization, it may also be a lack of water, or it may be a lack of nutrients, you can eat more fertilizer, water properly, supplement sunlight, ensure the depth of the soil, etc.

It should be caused by the lack of nutrients, in this case, we must pay attention to timely spraying of nutrient solution, timely ventilation, pay attention to light intensity, but also timely watering, but also timely fertilization.

Hello! It can be seen from the ** that the edge of the cucumber leaf is yellow, there are several cases, the first pesticide is watered at high temperature and burns to the leaves, and the second pesticide is improperly used and burns to the leaves. As can be seen from the second sheet**, the leaves are missing elements. It is recommended to apply some medium and trace element fertilizers.

Cucumber leaves turn yellow and some of the leaves wilt may be caused by diseases such as downy mildew, viral diseases or bacterial horn spots. If you have downy mildew, you can spray mancozeb and Pulik and other agents for local lead**, and if you have viral disease, you can spray poison buster agent**. If you have bacterial horn spot disease, you can spray copper succinate fertilizer agent for **.

1. Downy mildew.

The leaves of cucumbers are yellow, and some of the leaves are wilted may be due to downy mildew, and the temperature is between 16 and 22 degrees, and cucumbers are prone to downy mildew in the case of poor growth. Cucumbers have downy mildew, and after cutting off the diseased leaves and burning the lead heads, they can be controlled with chemicals such as mancozeb, Pulik, Anker, enoylmanganese zinc and gold redomir.

2. Viral diseases.

If the cucumber leaves are yellow and some of the leaves are wilted during the seedling period, it may be a viral disease. Viral diseases can cause the leaves of cucumber seedlings to turn yellow, dry and curly. If the cucumber has a viral disease, the diseased leaves should be cut off first, and then the cucumber should be sprayed with poison buster, which can be sprayed once in 7 10 days, and the disease can be relieved after spraying 3 or 4 times.

3. Bacterial keratopatch.

During the seedling period, cucumber has bacterial horn spot disease, yellow-brown lesions appear on the leaves, and the leaves will gradually dry up in the later stage. If the cucumber has bacterial horn spot disease, cut off the diseased leaves and branches and burn them intensively, spray the cucumber with copper succinate or Garry pesticide agent, and use a variety of agents alternately, and the effect is better.

4. White whitefly.

Whitefly is a common insect pest of cucumbers, which will attach to the young leaves of cucumbers and suck up nutrients and water from the leaves, which will make the leaves yellow and dry. If there are whiteflies on the branches and leaves of cucumbers, the branches and leaves should be cut off and burned in time, and the cucumbers can be sprayed with chemicals such as thiazinone, fenvalerate or deltamethrin for insect control.

Summary. Hello, yellowing of cucumber leaves can be caused by a variety of reasons, including lack of water, lack of fertilizer, pests and diseases, etc. Here are some possible workarounds:

1.Watering cucumbers: Make sure cucumbers get enough water every day, but avoid overwatering.

2.Fertilization: Give cucumbers the right amount of fertilizer, including organic fertilizer and chemical fertilizer.

3.Spraying pesticides: If pests and diseases are found, insecticides can be used to control them.

4.Make sure there's plenty of light: Cucumbers need plenty of sunlight to make sure they get enough light.

5.Cut off damaged leaves: If the leaves are already damaged or dead, you can cut them off so that the cucumber can focus on growing new, healthy leaves.

Please note that the above suggestions are for reference only, and the specific solutions need to be determined on a case-by-case basis. Thank you for your patience and hope the above information can help you, and I wish you a happy and prosperous day.

How not me. Hello, the yellowing of cucumber leaves may be caused by a variety of reasons such as body cracking, including lack of water, lack of fertilizer, pests and diseases, etc. Here are some possible workarounds:

1.Watering the cucumber: Make sure the cucumber gets enough water every day, but avoid overwatering.

2.Fertilization: Give cucumbers the right amount of fertilizer, including organic fertilizer and chemical fertilizer.

3.Spraying pesticides: If pests and diseases are found, they can be controlled with pesticides.

4.Make sure there's plenty of light: Cucumbers need plenty of sunlight to make sure they get enough light.

5.Cut off damaged leaves: If the leaves are already damaged or dead, you can cut them off so that the cucumber can focus on growing new, healthy leaves.

Please note that the above suggestions are for reference only, and the specific solutions need to be determined on a case-by-case basis. Thank you for your patience and hope the above information can help you, and I wish you a happy and prosperous day.

What medicine is used for diseases and insects.

Leaf yellow long class. Hello dear, there are other symptoms.

How**. Dear, hello, is the cucumber leaf yellowing with insects with any medicine?

Dear, hello, is the cucumber leaves yellow, and pests and diseases how to use medicine?

Hello, hello! The yellowing of cucumber leaves can be caused by a variety of reasons, such as lack of water, lack of fertilizer, pests and diseases, etc. If it is caused by pests and diseases, it is recommended to use pesticides for deficiency control, and the specific methods are as follows:

1.First of all, it is necessary to identify the types of pests and diseases, and then select the corresponding pesticides for control. 2.

Use in accordance with the method of use and dosage in the pesticide instructions, and pay attention to the safe use of pesticides. 3.In the process of using pesticides, we should pay attention to protecting our own health and the safety of the environment, and comply with the regulations on the use of pesticides.

4.After using pesticides, pay attention to the condition of cucumber plants, and find abnormal conditions in time for treatment. In addition to the use of pesticides for control, some biological control methods can also be adopted, such as the introduction of natural enemies.

At the same time, it is necessary to pay attention to the daily management of cucumbers, keep the soil moist, and apply fertilizer in a timely manner to enhance the plant's resistance to diseases and pests. Thank you for your patience, I hope the above information can help you, and I wish you a happy and prosperous day.