What is the reason why tomatoes grow and die when they roll up their leaves when they bloom and bear

Tomato leaf curling disease, check it yourself.

1. Leaf curling caused by viral diseases.

Symptoms: Viral diseases are generally transmitted by virus-carrying insects such as aphids and whiteflies. The susceptible plants are short, the leaves are curled and clumped, and in severe cases, the leaves only have veins and no mesophyll.

Prevention and control measures: in addition to the selection of antiviral varieties and the implementation of crop rotation, in the early stage of the disease, spray potassium permanganate 1000 times liquid, can also treat viral diseases and soft rot and other diseases, can also be added in 50 kg of water virus A (K) 100 grams, 50 grams of green Fenwei and a net 25 30 grams, made of mixed liquid spray control, spray once every 6 7 days, spray 2 3 times.

2. Leaf curling caused by hormone damage.

Symptoms: When too much or too high concentration of hormones such as 2,4 days and mequat and other hormones are used, the tomato leaves or growth points will be bent, the new leaves will not be normal, the leaf margins will be twisted and deformed, the stems and vines will be raised, and the color will become lighter. Prevention and control measures: It can be controlled with 3000 times of natural brassin.

3. Physiological leaf curling.

Symptoms: Before and after the tomato is harvested, the leaves of the first fruit are slightly curled, or the whole leaf is curled into a cylindrical shape and becomes brittle. This is mainly due to high temperatures and droughts, and the stomata of tomato leaves are closed.

Prevention and control measures: carry out drought resistance exercise after planting to before fruit setting, water and fertilize in a timely manner after fruit set, and cover the shade net, so that the day is covered and the night is uncovered, and the cloudy day is not covered.

Fourth, the leaf curling caused by the damage of the yellow mite.

Symptoms: Narrowing, stiffness, erection, shriveling or twisting of the leaves, and finally baldness. Control measures: It can be sprayed with 3000 times of Aifudin or 20 mites and 2000 times of 2000 times of dead liquid, sprayed once every 6 7 days, and sprayed 2 3 times in a row.

5. Leaf curling caused by nutrient deficiency.

Phosphorus deficiency: the back of the diseased plant leaves is purple-red, 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 in tomato seedlings will affect the absorption of phosphorus, and acidic or sticky soil will also easily lead to phosphorus deficiency in plants.

Control measures: increase the application of phosphorus fertilizer and spray potassium dihydrogen phosphate.

Magnesium deficiency: In the first inflorescence expansion stage, the old leaves in the lower part of the diseased plant lose green, and yellowing occurs between the leaf veins, and then expands upwards to form yellowed spotted leaves, and the heavy leaves are stiff or the leaf margins are rolled up. Prevention and control measures:

Increase nitrogen, phosphorus, potassium vegan fertilizer or foliar spray magnesium sulfate 50 100 times solution.

For three days of insect extermination, use the 30% suspension*, 100ml mixed with 15 kg of water, and wash the medicine pot before using the medicine.

Causes of the death of tomato leaf rolls:

1: The appearance of leaf curling is mainly related to the characteristics of tomato varieties, and there are some early-maturing varieties that generally curl the leaves of tomato plants from top to bottom when the fruit begins to be harvested.

2: Tomatoes because of pruning, leaf picking, too much and too heavy, topping too early, leaving too few leaves on the tomato plant, the weather is too hot, the transpiration of the leaf surface is intensified, it is easy to cause leaf rolling.

3: If you suddenly encounter a sunny day after a rainy day, or if the temperature in the protected area is very high and you suddenly encounter windy weather, it will curl.

4: Fertilization selection: In order to improve the immunity of tomatoes during growth, you can choose water-soluble fertilizer with fertile leaves, which is suitable for the whole growth period.

The head curl leaves are not long first, it is a virus, spray the green exhibition of the suspension fertilizer series a few times, just do it, and you can see the effect once.

Leaf roll is a honey worm, when flowering and fruit setting, it is rain, charcoal maggot, black rot virus, causing dead stem death.

This is a disease, which is generally caused by high temperatures, and can also be controlled with chemicals.

Generally speaking, potted tomatoes only bloom and do not bear fruit, mainly for the following reasons, and we also send solutions to each reason intimately, hoping to help you.

1. Pollination problems.

The flowers of tomatoes are bisexual flowers, and there are both pistils and stamens on one flower, which is a self-pollinating plant, so tomatoes planted in the open air are pollinated by wind or bees, so naturally there is no need to worry about pollination. But if your tomatoes are grown on an enclosed balcony, then you'll need to find a way to pollinate them.

Pollination solution: Tomatoes planted on a closed balcony are a good solution when they bloom, and the cold air from a hair dryer blows on the tomatoes' flowers. Or use a dry, clean brush (cotton swab) and brush each flower to help pollinate.

2. Planting too densely.

There is only so much space on the balcony that it is not easy to find and move soil, so some people will plant too many tomatoes in a very small area. At this time, each tomato is not nutritious, it is good to be alive, and it is even more difficult to bloom and bear fruit.

Too dense. Solution: If the planting density is too high, it will also affect ventilation, and the tomatoes will be more likely to get sick, and the results will naturally not be talked about. Planting less doesn't necessarily mean you'll get less, so be sure to be bold and keep the density reasonable.

3. The temperature is too high.

There are too many buildings in the city, and under the heat island effect, if the temperature is above 35 degrees during the day for a long time, it will be above 26 degrees at night, and the temperature difference between day and night is too small. Tomatoes undergo vegetative growth, shoots lengthen, leaves become more numerous, and the need for flowering decreases. At this time, even if it blooms, it is easy to fall flowers, and the fruit is small and easy to fall off.

The heat island effect. Solution: If the temperature is too high in the summer, try to avoid growing tomatoes during the hottest months of summer.

4. Insufficient light.

All fruits and vegetables need full sunlight, and the light saturation point of tomatoes is 70,000 lux, and the light intensity of 3-10,000 lux or more should be generally ensured. If your balcony gets less than four hours of light a day, tomatoes are sure to suffer from poor growth, less flowering and difficult fruiting.

Sunny balcony.

Solution: Keep the tomatoes in a place where the sun is more than six hours, and it is better if it is a balcony with full sun.

5. Soil or fertilizer problems.

A few years ago, an agricultural technology company in Wenzhou was sentenced to pay nearly one million yuan in compensation because of the pH value of the tomato cultivation substrate it prepared, which caused the farmers' tomatoes to only bloom but not bear fruit. If your soil is too acidic or alkaline, it will also cause the tomatoes to only bloom and not bear fruit.

Tomatoes are fertilizer-loving plants, and soils that are too poor will have few flowers and no fruits.

Composting solutions: improve soil pH; When fertilizing, we must adhere to the principle of thin fertilizer and frequent application, and try to choose organic fertilizer to improve the soil environment. If possible, the use of compost can increase soil organic matter while also improving soil vitality, so that tomatoes can bloom more and bear more fruit.

Some flower buds are not completely differentiated, some flowers only differentiate sepals, but do not differentiate the pistils, stamens and pollen of good flowers, and some flowers may be yellow or white in color, and eventually they will wither and wither.

Cause analysis: This situation mainly occurs due to the following reasons:

1. Excessive vegetative growth: the plant is prosperous, the leaves are larger, the joints are longer, and the stalks are thick and thin. This may be due to poor rain, high temperatures, or poor nutritional inconsistencies that cause tomatoes to grow too strongly.

Therefore, it is very important to adjust the tomato plant to the management process of tomatoes, among which the overgrowth of the plant has the greatest impact on tomatoes, because if the plant grows too vigorously, it may affect the flowering and fruit setting of the plants, and then affect the yield of tomatoes. The reasons for its formation are as follows:

1) Insufficient light and excessive temperature. When the temperature is high, especially at night, tomatoes will grow rapidly, the stalks will be jointed quickly, the joints will be long, and it will not be easy to set fruits.

2) Improper nutrients. If too much fertilizer is applied to tomatoes, especially nitrogen-containing fertilizers, the plant will absorb too much nutrients, and the plant will easily grow too vigorously.

3) Hormonal effects. Using fast-acting foliar fertilizers, which may contain certain hormones that promote growth, can cause tomatoes to grow too quickly, resulting in nutritional imbalances and plant growth.

2. High temperature affects flower bud differentiation: According to the research results, high temperature of tomatoes in the flower bud differentiation period will affect the normal differentiation of flower buds, and the inflorescence abortion and fruit can not be spotted or can not complete normal pollination, and the flower or fruit development is abnormal.

Solution: 1. Remove the leaves. Some of the vigorous leaves can be removed to adjust the growth of tomatoes.

2. Supplement calcium boron foliar fertilizer. In the case of rapid growth of plants or too high temperature, resulting in rapid evaporation of water and resulting in lack of calcium, etc., it will lead to insufficient absorption of boron calcium by crops, and it is recommended to spray foliar fertilizer + boron fertilizer containing boron calcium in Banedabica medium trace elements, which can play a role in preserving flowers and fruits to a certain extent.

The causes of tomato leaf curling can be divided into six types, viral diseases cause leaf curling, and the common types are: mosaic leaf 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 can be transmitted through contact with toxin-carrying insects and saps.

There are several main reasons. The first is the impact of high temperature and drought in the growing environment, and on the other hand, it is caused by improper management. Once tomatoes begin to bear fruit in large quantities, they are affected by high temperatures, both in greenhouses and in the open field.

1. When the temperature is high, the transpiration of leaf water is large, and the soil is dry. The water absorption of the roots cannot meet the transpiration needs of the leaves, so in order to reduce the transpiration of water, the leaves shrink. 2. The leaves of the infested tomatoes will show symptoms such as greening, smallening, and shrinking.

It is mostly manifested on new leaves and upper leaves, and is easy to occur under high temperature and strong light.

It should be rotten roots.

Tomato cultivation techniques.

Plot selection. You should choose deep soil, good drainage and irrigation, good ventilation and ventilation, and do not plant nightshade vegetables within 2 to 3 years, and do not choose areas without irrigation facilities for cultivation.

Breed selection. Choose varieties that are disease-resistant, high-quality, high-yield, resistant to storage and transportation, have good commerciality, and are suitable for market demand, such as Jintiewang.

Sowing seeds and raising seedlings. Sowing time in early March to early April is appropriate, according to the actual local situation reasonable arrangement of sowing time, the use of fertilizer ball way to carry out plastic film and small arch shed seedlings, and with the well-rotted farmhouse fertilizer mixed soil evenly pinched into a fertilizer ball of about 5 cm, and put a seed, evenly arranged with nutrient soil covering, at the same time apply a dilute water, covered with plastic film. Finally, it was covered with a small arch that was 8 meters wide and 8 meters long.

When there are 3** leaves growing, it is necessary to remove the film in time to ventilate and cool down, train the seedlings, and then plant them after a week.

Colonization management. Soil preparation and application of base fertilizer: 15 to 20 days before planting, apply 7 to 8 square meters of well-rotted high-quality circle fertilizer per mu, or 5 to 6 square meters of livestock and poultry will be stacked and fermented with the same amount of crop straw and then applied 100 to 150 kg of rotted cake fertilizer, using east-west high ridges.

If the greenhouse is cultivated 20 days before planting, the greenhouse is covered with film, and after the film is buckled, the bottom water is filled with ditching to irrigate the soil.

Planting method and density: plant spacing is kept at 50 to 60 cm, row spacing is kept at meters to meters, and 2000 tomato seedlings per mu are planted. At the same time, it is better to plant after 4 p.m. on a dull sunny day or on a cloudy day, and after planting, it is necessary to water the planting water thoroughly in time, and then water the seedlings once after 3 to 5 days.

Field management. Erection and pruning: when the tomato plant is about 30 cm high, it should be tied to the vine in time, and the "human" herringbone bracket is mostly used to erect the scaffold, and after the bracket is laid, the tomato trunk is fixed on the bracket with a plastic rope in the shape of an inverted figure 8, and a single stalk is used for pruning, each plant retains 5 to 6 spikes of flower spikes, and each spike retains 4 to 5 fruits.

In particular, it is necessary to remove the excess side branches in time and remove deformed fruits, diseased fruits, and excess fruits. In the later stage of growth, the old leaves and diseased leaves of the lower part should be removed in time to reduce nutrient consumption and disease propagation, and enhance the light properties of ventilation and transparency.

Cultivating weeding and cultivating soil: tomato seedlings can be cultivated and weeded, cultivating dust skin should be shallow without hurting the roots, and at the same time, remember that the tomato should be cultivated 2 to 3 times during the entire growth period.

Fertilizer and water management. Drip irrigation or dark irrigation should be used for watering, and the seedlings should be watered in time after planting, and the seedlings should be watered slowly after 3 to 5 days. The relative moisture of the soil is maintained at 60 to 70 percent in spring and 75 to 85 percent in summer and autumn.

Top dressing in time according to the length of the growing season and growth conditions. After deducting the basal fertilizer part, it is applied with water several times. It is worth noting that it is necessary to resolutely put an end to the use of organic fertilizers that have not been harmlessly treated, and it is advisable to use oil cakes and various biological fertilizers.

Tomatoes should be sprayed with pesticides, some pesticides can prevent tomatoes from falling flowers and fruits.

The yield of tomatoes should be increased, the moisture of tomatoes should be increased, and weeds should be removed frequently, etc., so as to prevent tomatoes from falling flowers and fruits.

Be sure to control the amount of water you use, never water too much, and make sure that the roots of the tomatoes are ventilated and not blistered.

Summary. Hello dear, happy to answer your <>

Tomatoes may not bloom and bear fruit for the following reasons: 1The temperature is not right:

Temperatures that are too high or too low can affect the stickiness of the pollen, causing the pollen to not bind successfully. 2.Insufficient or too much light:

Insufficient light can affect plant growth, while too much light can cause plants to age, which can affect fruit growth. 3.Nutritional deficiencies:

Plants lack essential nutrients such as nitrogen, phosphorus, potassium, etc., which can lead to stunted growth of fruits. 4.Insufficient water or over-irrigation:

Insufficient water will cause the plant to turn yellow and wilt, while excessive irrigation will cause the roots of the plant to lack oxygen and die, which will affect the growth of the fruit. 5.Anthers fail:

Some tomato-like plants, such as eggplant, may incorporate tomato-like qualities, resulting in clogged pores for pollen, preventing pollen from successfully binding. <>

What is the reason why tomatoes do not bear fruit when they bloom.

Hello dear, happy to answer your <>

Tomatoes may be unflowered for the following reasons: 1The temperature is not right:

Temperatures that are too high or too low can affect the stickiness of the pollen, causing the pollen to not bind successfully. 2.Insufficient or too much light:

Insufficient light can affect plant growth, while too much light can cause plants to age, which can affect fruit growth. 3.Nutritional deficiencies:

Plants lack essential nutrients such as nitrogen, phosphorus, potassium, etc., which can lead to stunted growth of fruits. 4.Insufficient water or over-irrigation:

Insufficient water will cause the plant to turn yellow and wither, and excessive irrigation will cause the root of the plant Yanchang jujube to lack oxygen and die, which will affect the growth of the fruit. 5.Anthers fail:

Some tomato-like plants, such as eggplant, may incorporate tomato-like qualities, resulting in clogged pores for pollen, preventing pollen from successfully binding. <>

In general, tomatoes that do not bloom and bear fruit can be caused by improper temperature, insufficient or excessive light, insufficient nutrients, insufficient water or over-irrigation, and failure of anthers. In order for tomatoes to grow smoothly, we need to provide the right growing conditions as much as possible, including the right temperature, tolerance, light, nutrients and moisture. <>