The causes of tomato leaf rolling, what causes tomato leaf rolling

Causes and solutions of tomato leaf curl disease:

1.Viral curl leaves.

During the growth of tomatoes, when they reach 20cm, some tomato leaves with poor geographical conditions and growing conditions begin to curl upwards or downwards. We gently stretch the rolled leaf with our fingers and see that the edges of the leaf are dry, or there are aphid curls inside, or there are other pathological features. This indicates that the plant is diseased.

Spray bacterial toxin water agent, Ningnanmycin water agent, etc. Water can play a good role in preventing diseases in the early stages of disease. In addition, spraying naphthalene acetic acid and potassium nitrate extra-root topdressing could improve disease resistance.

Second, the base fertilizer is insufficient, and trace elements are missing.

Among them, trace elements such as manganese, iron, and potassium are obviously insufficient. When planting tomatoes, continuous cropping should be avoided as much as possible. Before planting, it is necessary to dig deep into the soil and apply bottom fertilizer, which is mainly farmhouse fertilizer. If it is planted in a yard or in a large area, it is necessary to dig deep into the soil and pay attention to the application of biological fertilizer and compound fertilizer.

Thirdly, the plant is too heavy.

The most important link in the process of tomato operation management is topping, that is, to effectively control the vigorous growth, make the main branches bear fruit, and ensure effective nutrition**; It's the same with pinching branches. The branches branching off from each main branch should be cut off in time. No matter how it is managed, reasonable control of pinching and pinching management is the most important.

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It is physiological and pathological leaf curl. Excessive nitrogen fertilizer application will not only cause tomato plants to grow, but also cause tomato leaflets to turn over and roll up. Viral diseases are generally transmitted by poisonous insects such as aphids and whiteflies, and the affected tomato leaves will appear green, smaller, shrunken, curled and other symptoms.

Secondly, tomato wilt is not easy to find in the early stage of the disease, and the vascular bundles of the transverse stem in the later stage of the disease turn brown and the whole plant is curled. or celery.

Planted tomatoes why the leaves rolled up.

Many squatters who grow tomatoes will encounter the phenomenon of tomato leaf rolling, which is generally divided into physiological leaf roll and pathological leaf rolling, and we must first understand the cause of tomato leaf rolling.

Root damage

Excessive application of chemical fertilizer or unrotted organic fertilizer in acidic soil in the south and facility cultivation in the north caused the pH value to decrease. and the soil is dry and wet, or heavy water and fertilizer, resulting in damage to the root system and weakened ability to absorb water and fertilizer, and the lower leaves are curled and brittle.

High temperatures and dry soil cause leaf rolling

When the temperature is high, the transpiration of the leaves is large, the soil is dry, the roots can not absorb water to meet the transpiration needs of the leaves, and the self-protection state of the leaves makes the leaves retract or shrink, but the leaves are soft.

Nutrient deficiencies lead to or excessive nitrogen fertilizer application

Tomato needs a large amount of phosphorus, potassium and medium and trace elements to provide nutrients during the vigorous growth period. In addition, the soil has a low content of organic matter, especially when the fruit is stable or when the harvest begins, which requires a lot of nutrients.

If the nutrition is not effective**, the leaves of the first fruit branch will be curled, or the leaves of the whole plant will be cylindrical and brittle.

Excessive nitrogen fertilizer application will not only cause tomato plants to grow, but also cause tomato leaflets to turn over and roll up.

The concentration of dipping flowers is too large during the flowering period

When using 2,4-day dipping flowers, the concentration is too large or sprinkled on the leaves, causing the leaves to thicken, shrinkle or curl downward

Viral diseases

Viral diseases are generally transmitted by aphids, whiteflies and other poisonous insects, and the affected tomato leaves will appear greening, smaller, shrinking, curling and other symptoms, and the leaf curling is mostly manifested on the upper new leaves, which is easy to occur under high temperature and strong light.

Causes of pathological leaf curling in tomatoes

The pathogens that cause soil-borne diseases overwinter in the soil, and if the soil is not sterilized, coupled with soil compaction, the soil with too many root nematodes will exacerbate tomato bacterial wilt, which mostly occurs at noon and recovers in the afternoon.

It is not easy to find in the early stage of the disease, and the vascular bundles of the transverse stem turn brown in the middle and late stages of the disease, and the whole plant is curled. Therefore, soil disinfection and root maintenance are the top priorities to ensure stable and high yield of tomatoes

1. High temperature influence: when the outside temperature continues to exceed 35 degrees during the growth of tomatoes. 2. Produce drug damage:

When spraying pesticides on tomatoes, the concentration is too large and causes pesticide damage. 3. Improper pruning: pruning, plucking, topping too early for tomatoes, and excessive dust picking or one-time dusting.

4. Environmental discomfort: After a long-term drought, suddenly irrigate tomatoes.

1. High temperature influence

When the outside temperature continues to exceed 35 degrees, the transpiration rate of tomato leaves will be accelerated, so that the transpiration rate is greater than the water transport rate of the root system, resulting in the plant in a state of water shortage, the leaf stomata are forced to close, and the leaf edge is dehydrated and curled upward.

2. Produce drug damage:

If the temperature is high in summer, if the pesticide application concentration is not reduced in time, once the drug concentration is too large, the tomatoes will be damaged, causing the surface of the leaves to change color or produce spots, and the leaves will also curl upward.

3. Pruning should not be before pruning

If the tomatoes are pruned, pruned, topped too early, or too many leaves are picked at one time, the nutrients absorbed by the roots are nowhere to be transported, and they accumulate in the lower leaves, causing them to gradually age and harden and curl.

4. The environment is uncomfortable

When a long-term drought occurs, the tomatoes are suddenly irrigated with large water, resulting in the roots being soaked in water for a long time, and the transpiration of the leaves is inhibited, thus showing a state of self-protection, and the leaf edge will be reversed.

Here are some common ways to deal with the problem of tomato leaf rolling:

1.Check and adjust water management: It is important to ensure proper irrigation.

Avoid overwatering or drying out, and make sure the soil is kept moderately moist. It is advisable to use a soil tester or observe soil moisture to determine if irrigation is needed, and try to do it in the morning or evening.

2.Inspection and control of pests and diseases: Regularly inspect the plant, especially the back of the leaves, for pests, lesions or other abnormalities.

If a pest or disease is found, it can be treated with suitable pesticides or organic control methods. Be sure to use it according to the advice on the product leaflet and ensure safe operation.

3.Adjust the environmental conditions: Maintaining a stable temperature and a suitable growing environment is very important for tomato plants. If there are large temperature variations, consider providing shade or greenhouse protection to reduce plant stress.

4.Consider using virus-resistant varieties: If you suspect that the leaf curling problem is caused by a viral infection, you can choose to plant virus-resistant varieties of tomatoes. These varieties are highly resistant to specific viruses.

5.Adjust your cultivation method: Sometimes adjusting your cultivation method can help. Ensure proper plant spacing, prune and thin fruits at the right time, and promote good ventilation and light with limb segments.

It is important to observe the plant carefully and conduct further investigation to find out the root cause of the specific problem. If the problem persists or the situation worsens, it is advisable to consult with a local horticultural specialist or plant pathologist for more accurate and personalized advice. Good luck with your tomato plants getting back to good health as soon as possible!

The causes of tomato leaf rolling can be broadly divided into the following six types:

1. Viral diseasesVirus diseases cause leaf rolling, and there are 6 common types: mosaic type, fern leaf type, striped spot type, giant bud type, leaf roll type and yellow top type. The infected plants are short, the leaves are curled and clumped, and in severe cases, there are only leaf veins and no mesophyll.

Viral diseases are transmitted through contact with virus-carrying insects (e.g., aphids, whiteflies) and sap, and high temperatures and droughts facilitate their occurrence. Prevention and control measures: 1

Selection of antiviral varieties. 2.Implement crop rotation to reduce the source of primary infection.

3.At the onset of the disease, spraying 1000 times of potassium manganate aqueous solution with high simple clump can prevent and control soft rot and other diseases, and can supplement manganese and potassium. To control aphids and other poison-carrying insects, you can choose 10% imidacloprid 2000 times solution or 20% solution or 20% Kangfuduo 4000 times solution.

2. The symptoms of hormone damage such as 2 4-d are bent leaves or growth points, new leaves can not be normal, leaf margins are twisted and deformed, stems and vines are convex, and the color becomes lighter. Other hormones such as chlormequat and anti-drop hormone have milder symptoms than those of 2,4-d. Prevention and control measures:

The hormone concentration should be 20 ppm for medium-ripening varieties and 15 ppm for early-maturing varieties, and lower concentrations when the temperature is high. When using, be careful not to get on the young leaves or growth points, and never spray. After the occurrence of pesticide damage, some growth-promoting fertilizers can be applied, such as Op, natural brassin, etc.

The drug may be sold in a large area and without a disease center, which is different from other diseases.

3. Physiological leaf curling Before and after the tomato is harvested, the leaves of the first ear are slightly curled, or the whole leaf is curled into a cylindrical shape and becomes brittle. The reason for this is that due to high temperatures and droughts, tomato stomata close, causing the leaves to curl. Prevention and control measures:

After planting and before fruit set, drought resistance exercises should be carried out. After fruit set, water and fertilize in a timely manner and cover with a shading net. Cover during the day on sunny days, uncover at night, and don't cover on cloudy days.

Fourth, the main symptoms of tea yellow mite damage are narrowing of leaves, stiffness and erection, shrinkage or twisting deformity, and finally bald tips. Difficult to identify with the naked eye. The control agent can be selected with 15% pyridoxenone 3000 times, afudin 3000 times or 73% gmite 2000 times.

Fifth, the wind chill invades the shed and the indoor wind is too rapid, and the outdoor cold air and the indoor warm air exchange is strong, which is easy to cause the tomato leaves near the vent to curl. Under normal circumstances, as long as the cherry blossoms are released step by step, this kind of problem will not occur.

6. Deficiency of nutrients and phosphorus is manifested as purple-red on the back of the leaves, small brown spots appear on the leaves, the lower leaves are rolled up, the old leaves turn yellow, and the tips of the leaves are black-brown and die. Generally, low temperature at seedling stage will affect the absorption of phosphorus, and the soil is acidic or compact and prone to phosphorus deficiency, which can be solved by soil phosphorus fertilizer or leaf spraying potassium dihydrogen phosphate. Magnesium deficiency is manifested in the first flowering room expansion stage, the lower part of the old leaves lose green, and yellowing occurs between the leaf veins, and then expands upwards to form yellow spotted leaves.

In severe cases, the leaves are stiff or the edges are rolled up, and necrotic spots or brown patches appear between the veins. It can be solved by applying all-element fertilizers or foliar sprays of magnesium sulfate 50 to 100 times.

Tomato leaf curling may be caused by too much light, so it is necessary to take shading measures, transfer them to a semi-shady environment and water them every 3 to 4 days. It can also be caused by poor soil condition and stunted root growth, which requires loosening the soil to improve ventilation and drainage. It can also be caused by excessive fertilization, which requires irrigation with plenty of water to dilute the concentration of the fertilizer.

First, the root system is poorly developed or damaged, and the water absorption ability is weak, which makes the plant lack water; The second is high temperature and soil drought causing leaf rolling. When the temperature is high, the evapiration of leaf water is large, the soil is dry, and the root absorption of water can not meet the transpiration needs of the leaves, so the leaves close the stomata in order to reduce water transpiration, causing the leaves to shrink or shrink; The third is caused by insufficient nutrition.

1. The temperature is too high: When the temperature is too high, the tomato leaves close the stomata in order to reduce water loss. 2. Disease impact:

Tomatoes suffer from viral diseases. 3. Excessive spraying: spraying pesticides with too high concentration for tomatoes will cause fertilizer damage to the leaves.

4. Too early topping: Topping for tomatoes is too early, and the phosphoric acid in the leaves has nowhere to be transported.

1. The temperature is too high

When the temperature rises in summer, the amount of water transpiration in the tomato leaves is large, coupled with the arid climate, the water absorbed by the roots can not meet the needs of transpiration, and the leaves close the stomata in order to reduce water loss, resulting in the leaf shrinking or shrinking.

2. Disease impact:

When tomatoes are covered with pests such as aphids and whiteflies, the transmission efficiency of viral diseases will increase, and the infected leaves will appear discolored, smaller, shrunken and curled, which is more likely to occur in high temperature and strong light environments.

3. Excessive spraying

In the environment of high temperature and strong light in summer, vegetable farmers will increase the concentration of spraying pesticides in order to prevent tomatoes from being attacked by pathogens, resulting in a large number of residual pesticides on the leaves, and if not rinsed in time, it will cause the leaves to dry up and roll.

4. Topping too early

When planting tomatoes, take topping measures for them very early, and the phosphoric acid in the leaves will have nowhere to be transported, resulting in aging, shrinkage and even drying up of the leaves.