What s the deal with tomato leaf rolls? What s the deal with tomato leaf rolls?

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.

1. Caused by high temperature or drought.

When planting tomatoes in the high temperature season, the leaves of the first ear are generally slightly curled, or the whole leaves are curled into a cylindrical shape and become brittle.

Cause: Due to high temperature and drought, the leaf stomata are closed, causing the leaf to curl.

Rescue measures: drought resistance exercise after planting and before fruit setting; Watering and fertilizing in a timely manner after fruit set, pay attention to avoid excessive drought, and do not water large amounts of water after drought, especially pay attention to not watering tomatoes at noon in high temperatures: at the same time, use shading nets to cover, cover during the day on sunny days, uncover at night, and do not cover on cloudy days.

2. Caused by wind chill.

For the tomatoes in the shed, the wind in the shed is too rapid, and the cold air outside and the warm air inside exchange strongly, which can easily cause the tomato leaves near the vent to curl.

Rescue measures: Under normal circumstances, as long as the seedlings are gradually released, this kind of problem will not occur. At the same time, increase the application of organic fertilizer to improve the stress resistance of plants!

3. Caused by improper fertilization.

If too much nitrogen fertilizer is applied, it will cause the leaflets to turn and curl; Phosphorus deficiency is manifested as purple-red on the back of the leaves, small brown dots appear on the leaves, the lower leaves roll up, the old leaves turn yellow, and the tips of the leaves are black-brown and die.

Magnesium deficiency was manifested in the first flowering room swelling stage, the lower part of the old leaves of the plant lost green, and yellowing appeared between the leaf veins, and then expanded upwards to form yellowing leaves. In severe cases, the leaves are stiff or the edges are rolled up, and necrotic spots or brown patches appear between the veins.

Rescue measures: control the excessive use of nitrogen fertilizer; Generally, low temperature at seedling stage will affect the absorption of phosphorus, and the soil is acidic or compact, which can be solved by applying phosphorus fertilizer or spraying potassium dihydrogen phosphate on leaves; Magnesium deficiency can be addressed with all-element fertilizers or foliar magnesium sulfate sprays.

Tomato physiological leaf curling is generally caused by the following three aspects: first, poor root development or injury, weak water absorption ability, resulting in plant water shortage; 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.

The low content of organic matter in the soil, the lack of essential elements will affect the growth of plants, especially after the fruit sits or begins to harvest the fruit, a lot of nutrients are needed, if the nutrition is not effective, there will be curl of the leaves of the first fruit branch, or the whole plant leaves are cylindrical and brittle.

Viral diseases cause leaf rolling.

Viral diseases are generally transmitted by toxin-carrying insects such as aphids and whiteflies. Affected tomato leaves will show symptoms such as greening, shrinking, shrinking, and curling. Leaf curling, mostly manifested in the heart leaf and upper leaves, is easy to occur under high temperature and strong light.

There are 6 common types: mosaic, fern, striped, macrobud, curly, and yellow-topped. The infected plants are short, the leaves are curled and clumped, and in severe cases, there are only leaf veins and no mesophyll.

Leaf curling caused by pesticide damage.

In summer, when the temperature is high, some vegetable farmers do not pay attention to reducing the concentration of pesticides, once the concentration of drugs is too large, the surface of the leaves will be discolored or spotted, and the leaves will also curl upward.

Premature topping leads to leaf rolling.

Premature topping is easy to breed axillary buds, and the phosphoric acid in the leaves has nowhere to be transported, resulting in leaf aging and leaf curling.

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.

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!

Tomato leaf curling can be caused by too much light, and the method is to take shade measures.

Too much sunlight will cause tomatoes to roll their leaves, move them to semi-shade and incubate, watering them every 3-4 days. Do a good job of shading measures, and it is also a good choice to breed in vegetable greenhouses. In the case of poor soil conditions and leaf curling caused by stunted root growth, it is necessary to loosen the soil and improve ventilation and drainage.

Tomato (Tomato) is an annual herbaceous plant of the Solanaceae family, with plants up to 2 meters tall. Stems are prone to lodging; The leaves are pinnate compound leaves, wedge-shaped at the base, more oblique, and have irregular nucleus-tolerant serrations; Corolla radiate, yellow, lobes narrowly oblong; The berries are oblate spherical or nearly spherical, fleshy and juicy, orange or bright red, smooth surface, flowering and fruiting in summer and autumn; The seeds are yellow and covered with pubescence.

Introduction to tomatoes

Native to South America, the tomato was originally a wild berry in South America, and was considered to be "the fruit of the fox" for its bright color and poisonousness, and was only used for ornamentation. It was first introduced to China as an ornamental plant, and it was not until the mid-to-late 19th century that Chinese began to eat tomatoes, and began to be cultivated on a large scale in major cities such as Shanghai. Tomato is a temperature-loving crop, which has a wide adaptability to soil, but has a large demand for fertilizer. Poor waterlogging resistance requires good drainage conditions.

As a cultivated plant, scholars believe that tomato was introduced to the Liangguang region of China by foreign missionaries in the mid-to-late 16th century during the Wanli year of the Ming Dynasty (earlier than 1599) and spread to several regions, and it is uncertain when it was introduced to China.

The above content refers to Encyclopedia-Tomato (Solanaceae).