Cucumber seedlings wilt during the day and get better at night, what s going on? How to prevent it?

Cucumber seedlings wilt during the day, but at night the disease becomes lighter, considering that it is a common disease of melons "wilt", this disease not only appears on cucumbers, most of the melons can suffer from this disease, generally speaking, the seedlings that occur in melons, the leaves show yellowing and wilting, and the rhizomes of serious diseased plants turn brown, as if the whole plant is cataplexed like lack of water, especially at noon, and can be recovered at night, however, after several days of repeatedness, all the leaves of melon seedlings wither and droop and will not return to their original state.

Fusarium wilt** and how it spreads.

Fusarium wilt causes the seedlings to wilt, mainly because the fungus blocks the conduit for the melon seedlings to transport water, and the pathogen contains toxins that affect the normal squeezing of the melon seedlings, so that the leaves of the seedlings turn yellow and die, and the melon seedlings infected with the blight are easy to pull out, this is because they feel the roots, and the roots become brown and rot.

The most common mode of transmission of Fusarium wilt is soil-borne and due to continuous planting, the fungus survives in the soil with the remains of the diseased plant and invades through the roots of the seedlings, in addition to the fact that the fungus can also be transmitted to the plant through unrotted manure and, if the blight occurs in nearby crops, the disease can also be transmitted through insect pests.

Methods of prevention and control of wilt.

Choose some disease-resistant seeds for planting, seeds can be soaked in carbendazim hydrochloride for germination sowing before seed sowing, planting methods to take 3 years of crop rotation, do a good job of pesticide prevention in the melon seedling stage, spray fludioxonil double liquid irrigation roots, early stage of disease can be controlled with spring leimycin and sodium disulfon. After each harvest, do a good job of cleaning up the field, remove the residue of melon seedlings, and use the sun to expose the soil to high temperature for sterilization.

1. Symptoms of Fusarium wilt: Fusarium wilt can occur from the seedling stage to the adult stage. At the seedling stage, the cotyledons turn yellow and dry up, and the base of the stem and roots turn brown.

When the adult plant is sick, the leaves wilt at noon, and recover in the morning and evening, and the leaves become lighter due to lack of water, and then the leaves wilt and cannot recover, and finally die. The stems of the diseased plants soften and shrink, and then dry up. The base of the disease is often longitudinally cracked, and there is an overflow of ester on the surface, and pink mold is produced when wet, and the base is cut crosswise, and the tube bundle can be seen to turn brown.

2. Prevention and control methods: It is an important measure to choose disease-resistant varieties such as Changchun Mithorn and Jinza No. 2 for planting. Sowing seeds with 25 benzylat wettable powder or 50 carbendazim wettable powder 500 times solution for 1 hour to disinfect seeds.

Root protection measures should be taken during seedling raising to reduce root damage. Crop rotation of more than 3 years is implemented. Apply more organic fertilizers.

Grafting seedlings is an effective measure to prevent wilt disease, rootstock Zhu Zhu with Yunnan black seed pumpkin, nutrient bowl seedlings, cotyledon stage with plugging, grafting and other ways. This is my opinion, I hope you can refer to it.

It may be caused by the temperature being too high during the day. Proper hydration should be given to keep the soil moist to cool down the plants. Give cucumber seedlings more ventilation. When the light is strong, cucumber seedlings should be shaded.

Considering that it is a common disease of melons "wilt", choose some seeds with strong disease resistance for planting, and before seed sowing, you can use carbendazim hydrochloride soak seeds for germination and sowing, and the planting method adopts 3-year crop rotation to do a good job of pesticide prevention in the melon seedling stage.

This is because there is too much watering. Allow the base of its stem to rot. Fertilization should be reasonable and water control should be carried out in the early stage.

(1) wilting: the greenhouse spring cucumber encounters disastrous weather in the early growth stage, due to the fact that the grass is not uncovered for a few days, the cucumber can not photosynthesize, the plant is in a state of starvation, the soil temperature is low, and the root activity is also very weak. Once the greenhouse temperature rises suddenly, the air humidity decreases, the leaf moisture transpires quickly, the root system absorbs water weakly, and the underground part transports less water upward, and the leaves will temporarily wilt.

When it suddenly clears after a few days of sunshine, and the sun is very bright, don't uncover all the grass at once. The best way to do this is to uncover the wilting and cover it again, and then uncover it after the leaves have recovered. For the convenience of management, you can also uncover some of them first, and gradually uncover all of them.

When the wilting of the leaves is more serious, you can also use a sprayer to spray water on the leaves to prevent excessive wilting and damage to the leaves.

2) Flower topping: that is, close to the growth point, the small leaves are dense, and small melons appear in the axils of each leaf. The reason is that the temperature is low, the temperature difference between day and night is too large, the root activity is weak, the photosynthetic products are few, the amount of transport to the new part at night is small, the vegetative growth is inhibited, and the reproductive growth exceeds the vegetative growth.

In addition, the lack of water in the soil can also cause the phenomenon of flower topping. The prevention method is to cover the small arch shed at night before the frame is inserted, and the temperature is not ventilated during the day, so as to increase the temperature as much as possible; If there is a shortage of water, it should be irrigated in time. The flower topping of individual plants is caused by root damage or loose soil damage to some roots.

The basal fertilizer is not fully rotted or the top dressing is uneven, which causes some roots to be damaged. wilting of individual plants; Methods such as not topdressing the wilted plants, replenishing water, and removing female flowers can be used to promote growth.

Question: Is there a remedy for the melon harvesting period now?

Hello! When the wilting of the leaves is more serious, you can also use a sprayer to spray water on the leaves to prevent excessive wilting and damage to the leaves.

Question: If the problem with the roots, is there any rooting fertilizer to make the new roots growHello! It can be used to promote growth by replenishing water and removing female flowers.

Question: Is it still the same if the water is enough.

Hello! If you have enough water, you can observe it for a few days and see if you don't need to fertilize it.

Water is missing, the light is too strong to evaporate water, and the cucumber will wilt when it lacks water, so it can be watered in time; If the fertilizer is not treated, the application of unrotted fertilizer will cause root damage and wilting of the plant stem; Suffering from root rot, the disease makes the seedling roots unable to absorb nutrients to supply cucumbers, so that wilting, the root system can be treated with pesticides; Insect pests invade, insect pests will absorb the water and nutrients of cucumbers, which can be manually removed.

Cucumber seedlings wilt in the sun because the light is strong in summer, and the environmental temperature of planting is too high, resulting in a relatively large amount of water evaporation from the leaves, and the speed at which the roots absorb water cannot be equal to the speed of water evaporation, so the plant will wilt, and the plant can be replenished with water in time.

If the organic fertilizer is used when applying fertilizer to cucumber seedlings, and it has not been processed by rotting and fermenting, there will be smoked seedlings and root damage, and the root system will be harmed after causing fungi to be more likely to infect cucumber seedlings.

Cucumber seedlings infected with root rot will cause damage to the root system of the plant and cannot absorb nutrients, you can use agents such as oxafen or methyl tobuzin, and you can also add downy mildew vienoylmorpholine, enoylmorpholine and occultamine ingredients to water the root system of cucumber seedlings.

Cucumber seedlings are also prone to wilting symptoms when they are attacked by insect pests, because the water and nutrients of the leaves are gradually sucked by the pests, so that the plants can not grow and develop normally, and can be eliminated by manual removal of insect pests, or spraying insecticides.

The cucumber wilts at noon, because there is a lack of water, and the sun is too sunny.

Cucumber cultivation techniques.

5 cubic meters of organic fertilizer for land preparation and fertilization, 25 to 30 kg of superphosphate or 10 to 15 kg of diammonium phosphate (5 kg per cubic meter of superphosphate, 2 to 3 per cubic meter of diammonium phosphate). Before planting, plough the furrow, the width of the furrow is more than 15 cm, and it is covered with mulch.

Determination of the planting period: planting as soon as possible on the premise of ensuring that there is no freezing after planting, and planting in Chengde area is generally in late April and early May. Temperature index requirements:

The minimum night temperature is above 5 and the soil temperature is above 12 at 0 to 10 cm. The cucumber in the autumn dew field adopts the method of live broadcasting.

Planting density: 4000 to 4500 acres, planting in large and small rows, small row spacing 40 cm, large row spacing 80 cm, plant spacing 25 to 30 cm, planting with dark water method.

Manage shelfs. After planting, the shelf should be planted as soon as possible, and the seedling should be pumped by wind, and the shelf can be a flower stand or a herringbone frame, about 8 to 10 cm away from the root.

Tie vines. The "8" method is used to tie vines to prevent abrasion of stems and vines and sagging stems. Every 2 to 3 knots are tied, should be carried out in the afternoon, the stem vine is easy to break in the morning, the tightness of the vine should be suppressed and the weak should be strengthened, and the growth of the plant should be tied a little tighter, and the height of the growth point is consistent.

Pruning and pinching. For the main vine, all the side branches should be removed, and one or two leaves should be left after the side vine is fruitful, and all the tendrils should be removed. When the stem exceeds the head of the shelf, it is necessary to pinch the tip in time to promote the growth of the lower melon, and the method of twisting the tip can also be used to inhibit the growth of the upper part.

Fertilizer and water management. Timely watering and cultivating, the amount and frequency of water depends on the weather and growing period. Slow seedling water is watered 5 to 7 days after planting; water control, cultivating, and squatting seedlings before sitting on melons; When the root melon is 10 to 12 cm long, water the melon; Watering during the fruiting period is done every 5 to 7 days.

The principle of top dressing is that the front is light and heavy, a small amount of many times, urging melon fertilizer to be applied after the root melon sits, and the melon fertilizer is carried out after the root melon is harvested. Promote the use of organic fertilizer topdressing.

This is a normal physiological phenomenon, don't worry. At noon, the light is too strong, the temperature is high, and the transpiration is caused by excessive water loss.

Causes of wilting: 1. In even cloudy weather, the indoor temperature is low for a long time, the ground temperature is low, and the growth of vegetable seedlings is weak;

2. When planting cucumber seedlings, if too much fast-acting chemical fertilizer is applied in the base fertilizer, the brightness of the chemical fertilizer in the soil is higher, which will damage the root tip and reduce the ability of the root system to absorb water and inorganic salts;

3. When the weather is clear, the grass is suddenly uncovered, so that the temperature rises rapidly, and the transpiration of the leaves is enhanced, resulting in physiological water loss and wilting of the seedlings;

4. Flood irrigation can also cause plants to wilt. After irrigation, the soil water content is too high, the air permeability is poor, and toxic substances are produced in the soil under anoxic conditions, so that the root system is poisoned or suffocated by lack of oxygen and wilts.

Pre-forest defense measures:

1. Strengthen seedling management, cultivate strong seedlings, and prevent and control pests and diseases in a timely manner;

2. Strengthen the warmth and warming of the greenhouse, pay attention to heat preservation when the cold snap comes, and pay attention not to water, so as not to reduce the soil temperature;

3. Apply less fast-acting chemical fertilizer, apply more well-rotted organic fertilizer, and carry out root topdressing;

4. When the weather is fine, the shed should be removed from the grass in the spring, and the old leaves should be removed in time to reduce transpiration, and then all the grass should be pulled after the seedlings return to normal growth;

5. 15 to 20 days before cucumber planting, watering should be drip irrigation, avoid flood irrigation, and maintain good soil air permeability.

Unsuitable planting environment: Cucumbers prefer an environment with plenty of sunlight, fertile soil, and suitable moisture. If the planting environment does not meet the conditions for cucumber growth, it is easy to cause the seedlings to become weak and weak.

2.Overwatering or lack of water: Cucumbers prefer warm, moist growing environments, but they should not be too wet or too dry.

Overwatering or lack of water can affect the growth and development of cucumbers, and the seedlings become sluggish. 3.Pest and disease infestation:

Some viruses and bacteria can infect cucumbers and cause yellowing, curling, and death of leaves. In addition, some insects such as aphids and whiteflies can also cause damage to cucumbers. Here's how to fix it:

1.Check whether the planting environment is consistent with the growth requirements of cucumbers, such as ensuring that the soil is fertile, has good air permeability, and reduces salinity. 2.

Control the amount of watering and allow the top layer of the soil to dry a little after each watering before watering the next time. At the same time, it also avoids wilting caused by lack of water. 3.

Pay attention to the prevention and control of pests and diseases, and do a good job of cleaning and disinfection regularly. In case of pests and diseases, measures should be taken to eliminate pests in time, and biological pesticides or organic pesticides can be used.

I received it yesterday afternoon, I planted it last night, and it wilted today, what.

Cucumbers prefer environments with plenty of sunlight, fertile soil, and suitable moisture. If the planting environment does not meet the conditions for cucumber growth, it is easy to cause the seedlings to become weak and weak. 2.

Overwatering or lack of water: Cucumbers prefer warm, humid and humid growing environments, but they should not be too wet or too dry. Overwatering or lack of water can affect the growth and development of cucumbers, and the seedlings become sluggish.

3.Pest and disease infestation: Some viruses and bacteria can infect cucumbers and cause yellowing, curling, and death of leaves.

In addition, some insects such as aphids and whiteflies can also cause damage to cucumbers. The solution is as follows: 1

Check whether the planting environment is consistent with the growth requirements of cucumbers, such as ensuring that the soil is fertile, has good air permeability, and reduces salinity. 2.Control the amount of watering and allow the top layer of the soil to dry a little after each watering before watering the next time.

At the same time, it also avoids wilting caused by lack of water. 3.Pay attention to the prevention and control of pests and diseases, and do a good job of cleaning and disinfection regularly.

In case of pests and diseases, measures should be taken to eliminate pests in time, and biological pesticides or organic pesticides can be used.

Dear, I received it yesterday and it wilted today, and it is likely to be the first reason.

Don't worry, it needs to slow down the seedlings. Let it get used to it for a day or two at first, and then the sun can't be too strong, remember to water it.

Give it a few days and it will be fine.

Remember to fertilize it in a few days.

How will it be in a few days?

Yes, let it slow down, don't worry, there's nothing wrong with planting it in the open air. Remember to teach it some water every day, but don't water it too much.