What are the 27 common diseases of tomatoes?

The 27 common diseases of tomato are black spot, corynebacterosis, rhizopus fruit rot, black spot, nematode disease, gray leaf spot, gray mold, gray leaf spot, stem base rot, sclerotinia discosis, fusarium acuminearosis, Fusarium fruit rot, coal stain disease, fruit rot of S. solizum, fruit rot of S. solitaria, acid rot, anthracnose, late blight, leaf mold and Phytophthora root rot.

1. Tomato late blight.

Hazard characteristics. 1. Seedlings, leaves, stems and fruits can all be affected, with leaves and fruits in the green maturity stage being the most affected. Damage at the seedling stage: water-soaked dark green lesions appear on the leaves, and spread to the petioles and stems, causing the thinning to become black-brown and rotting, and the seedlings wilt and die.

2. Damage at the adult stage: the disease mostly starts from the lower leaves, starts from the leaf edge or leaf tip, and there are water-soaked pale green lesions on the leaf surface, which gradually turns brown and necrosis, and then expands to the whole leaf; When the air humidity is high, there is a sparse white mold layer on the edge of the lesion on the back of the leaf. Petioles, stems and tidbits are damaged:

irregularly shaped, sunken, large brown spots with unclear margins; When the humidity is high, there is a gray-white mold layer on the surface.

3. Fruit damage: there are irregularly shaped necrotic spots, and the edges are moire.

2. Tomato cotton blight.

Hazard characteristics. 1. It is mainly harmful to fruits, leaves, and serious damage. Fruit disease:

It first occurs near the top of the fruit or on the shoulder of the fruit, with light brown spots with smooth surface, sometimes a small amount of white mold, and then concentric whorl-like spots, which turn dark brown and the subcutaneous flesh also turns brown. When the humidity is high, the diseased fruit grows white mold, and the diseased fruit mostly remains in its original state, does not soften, and is easy to fall off.

2. Leaf disease: water-soaked green spots appear, slowly decaying, and sometimes concentric wheel patterns can be seen.

3. Tomato bacterial canker disease.

Hazard characteristics, tomato can be diseased throughout the growth period.

1. Seedling infection: the true leaves wilt from the bottom up, depressed necrotic spots appear on the petiole or hypocotyl, and the vascular bundles can be browned and the pith appears hollow in the cross-sectional stem.

2. Infection at the adult stage: often wilted from the edge of the lower leaf of the plant, gradually rolled upward, and then the whole leaf was diseased, the leaves were blue-brown, shriveled, dry, hanging on the stem without falling off, like drought and lack of water and dying.

3. Stem infection: there are green stripe spots, ulcers, hollow inside and the vascular bundles turn brown, later sagging or cracking, the stem becomes thicker, and many thorns or adventitious roots are born; When the humidity is high, there is a spillage of white bacteria and pus.

4. Fruit infection: in severe cases, bird's eye-like protrusions are produced.

Fourth, tomato cataplexy.

Hazard characteristics. The disease occurs mainly on seedlings from cotyledons to 2 to 3 true leaves. It mostly occurs at the base of the stem touching the ground, and the water-stained lesions first appear at the beginning, then turn yellow-brown, shrink into a line, and shrink and lodging before the cotyledons wither; At the beginning of the disease, it withers during the day, but still recovers at night, so that after 2 to 3 days, the symptoms of cataplexy appear.

When wet, the affected area produces a white mold layer or rots.

5. Tomato verticillium.

Hazard characteristics. The leaves gradually turn yellow, wilt and roll up from bottom to top; The lateral veins first turn yellow, forming a distinct wedge-shaped macula, and then gradually expand to the whole leaf, and finally the diseased leaf turns brown and dies, but the green color of the petiole can still be maintained for a long time; The outcome of severe illness is small or non-conclusive. The stem of the diseased plant is dissected, and the duct turns brown, which is different from blight.

3. Tomato blight.

Fourth, tomato virus disease.

5. Tomato anthracnose.

6. Tomato umbilical rot, 7. Tomato late blight, 8. Tomato cotton blight.

9. Tomato bacterial canker, 10. Tomato cataplexy, 11 tomato verticillium wilt, 12 tomato wilt questions, this is only 12.

Please wait a minute, okay.

Asking a question [smiles].

Tomato virus disease, tomato bacterial wilt, tomato bacterial spotted disease, tomato bacterial soft rot, tomato scab, tomato rhizopus fruit rot, tomato pseudoblack spot, tomato coal stain, tomato stem base rot, tomato black spot, tomato circular striation, tomato leaf mildew, tomato tendon rot.

Common diseases of tomatoes are: tomato cataplexy, tomato blight, tomato virus disease, tomato leaf mold, tomato early blight, tomato bacterial spotted disease and so on.

1. Tomato cataplexy.

It is a common disease in the seedling stage of tomato. During the seedling raising period, the disease of the potato is serious in the low temperature and rainy years, and the disease is serious, and the seedlings often die in patches. After the seedlings are unearthed, they are damaged, and the stems are infected near the ground.

It begins with dark green water-stained lesions, then turns yellowish-brown and shrivels and shrinks, and the plant is lodging, but the stems and leaves are still green.

2. Tomato blight.

One of the common diseases of tomato seedlings, the disease can occur when the newly unearthed seedlings and large seedlings are infiltrated. The stem base of the diseased seedling becomes brown, and the diseased part shrinks and becomes thinner, and the stems and leaves wilt and die. Slightly larger seedlings wilt during the day and recover at night, and when the lesions wrap around the stem, the seedlings gradually die, but do not fall.

At the beginning of the disease, oval dark brown spots appeared, with concentric ring stripes and light brown arachnoid mold.

3. Tomato virus disease.

Generally, the disease is mild in the early stage of greenhouse tomatoes in spring, and after entering May, fern leaves and mosaic leaves begin to worsen. After the autumn delay, the tomato virus disease was more serious than that of the spring greenhouse, and the main viruses were fern leaves and striped spots. The leaves appear yellow-green or dark and shallow mottled, the leaf veins are transparent, the leaves are slightly shrunken, the diseased plants are slightly shorter, the new leaves are small, the fruit is small, the fruit surface is of poor quality, and most of them are flower-faced.

4. Tomato leaf mildew.

Tomato leaf mold mainly damages leaves, and in severe cases, it also damages stems, flowers and fruits. Leaves. The onset of leaves starts from the middle and lower leaves and gradually expands to the upper leaves.

In the early stage, oval or irregularly shaped yellowish pale green spots appear on the front of the leaves. In the later stage, the diseased part has a brown mold layer or necrosis; The dorsal part of the leaf is initially white mold layer, and then changes to purple-gray to black dense velvety mold layer. When the disease is severe, the leaves are covered with diseased spots or patches of diseased spots, and the leaves gradually curl and dry up.

5. Tomato early blight.

Tomato seedlings and adults can be diseased, and the disease is more serious in greenhouses and greenhouses. It mainly harms leaves, stems, flowers, fruits and other parts, and leaves and stems and branches are the most susceptible to disease. The leaves appear water-stained dark brown lesions, enlarged and nearly rounded, with concentric rings, and many edges with light green or yellow halos.

6. Tomato bacterial spotted disease.

Sowing infected seeds can cause disease in seedlings. It can be infected at both seedling and adult stages. At first, it appears as a water-stained dot, then expands into dark brown irregular spots with yellow halos around it.

When the humidity is high, bacterial pus can be seen in the later stage of the lesion. The young fruit is infected with the disease, and small spots that are slightly raised appear at first. When the fruit is nearing ripeness, the tissue surrounding the spot remains green for a long time, unlike other bacterial spot diseases.

The 27 common diseases of tomato are black spot, corynebacterosis, rhizopus fruit rot, black spot, nematode disease, gray leaf spot, gray mold, gray leaf spot, stem base rot, sclerotinia discosis, fusarium acuminearosis, Fusarium fruit rot, coal stain disease, fruit rot of S. solizum, fruit rot of S. solitaria, acid rot, anthracnose, late blight, leaf mold and Phytophthora root rot.

There are many kinds of tomato diseases, and the main diseases are virus disease, late blight, gray mold, leaf mold, early blight and canker.

These diseases often occur at the same time and alternately in actual production, and the onset is early, violent, fast-prevalent, and harmful, and the insect pests are mainly aphids, greenhouse whiteflies and cotton bollworms.

Seedlings are susceptible to blight, blight, pests have whiteflies, aphids, thrips, etc., should pay attention to the prevention and control, sowing with 50--52 hot water for 20 minutes, can kill most of the germs inside and outside the seed, and then soak the seeds to promote germination.

Seedbed soil disinfection, 5-10 grams per square meter of seedbed mixed well and then sown, cover soil should also go through the same treatment, can prevent and control most of the diseases in the seedling stage.

The high temperature in the early stage is prone to various diseases such as root rot (dead trees), early blight, leaf mold, etc., and sclerotinia may occur in individual greenhouses. In November, the focus was on the prevention and control of gray mold.

Due to the low temperature, the abnormal growth of fruits and the abnormal performance of plants are mostly caused by low temperatures, and are not caused by pathogenic bacteria, which is called non-infectious diseases.