What do tomatoes grow on their leaves? What do tomato leaves look like?

There will be a lot of white circles on the fruit of the diseased tomatoes, and different white circles represent different diseases, so let's talk about the different manifestations of these two diseases in detail below.

This white circle is a symptom of canker disease, a bacterial disease that can flare up from seedling to harvest. The first symptoms are mainly distorted edges of the lower leaflets, drooping and dehydration.

At the peak of the disease, white spots appear on the leaves and petioles, and dark streaks appear on the branches, spreading up and down, causing the stems to crack and turn brown until they affect the fruit, appearing this white circle that resembles an eye.

The disease prefers low temperatures and high humidity environments, where bacteria enter through the breach and spread through routine activities such as watering. If it is planted in a greenhouse, it is easy to spread germs when the temperature in the greenhouse is high and the leaves or fruits are dewy for a long time.

In addition, after the fruit reaches the green ripening stage, some white circles occasionally appear on the surface. After this happens, there is not much abnormality in the fruit, and such a white circle does not affect the development of the fruit, but it does not slowly disappear either.

The second type of white circle is a symptom of gray mold. The reason for this symptom is that the conidia germinate on the surface of the unripe fruit, the mycelium cannot continue to grow on the fruit, and the fruit surface is resistant to Botrytis botrytis infection.

The canker bacteria can overwinter on seeds, diseased bodies, soil and weeds, and can survive in the soil for 2-3 years. The incidence is high and severe in warm and humid, poorly ventilated, rainy, prolonged dew condensation, and alkaline soils. At 25 - 28 years old, it is easy to get sick when the relative humidity exceeds 80%.

After the onset of the disease, water supply for irrigation and the application of fertilizers can easily lead to the spread and epidemic of the disease over a large area.

Botrytis is a fungal disease caused by pathogen invasion from host wounds or senescent organs. Lack of light, poor ventilation, excessive humidity, constant rain, etc. are all important factors that contribute to this disease.

In addition, nutrient deficiencies and stunted growth can also lead to high morbidity. Temperature 20 23 , ambient humidity greater than 90 %. It is an environment with a high incidence of disease.

From the beginning of March to the first 10 days of April, the disease begins in the leaves, with the highest incidence from late April to late May.

Relevant precautions should be carried out as soon as possible, and preventive measures should be taken. In the process of drug control, it is recommended to alternate several drugs to avoid bacterial resistance and affect the control effect.

Check the dorsal part of the lower lobe for aphids, or spider mites like spiders.

Tomato leaves: leaves pinnately compound or pinnate deeply lobed, 10-40 cm long, leaflets very irregular, varying in size, often 5-9, ovate or rectangular, 5-7 cm long, with irregular serrations or lobes on the margins.

Tomato is an annual or perennial herbaceous plant of the tubular, Solanaceae, tomato genus, the body is tall and rice, the whole is mucous glandular hairs, has a strong odor, the stem is easy to lodging, the leaves are pinnate compound leaves or pinnate deep lobes, the total peduncle length of the inflorescence is 2 5 cm, often 3 7 flowers, the calyx is radial, the corolla is radial, the berries are oblate or nearly spherical, fleshy and juicy, the seeds are yellow, the flowering and fruiting period of summer and autumn tomato is native to South America, and is widely cultivated in northern and southern China. The fruit of tomato is rich in nutrients and has a special flavor. It can be eaten raw, cooked, processed in ketchup, juice or canned whole fruit.

One is mosaic virus disease, which is manifested as a slight mosaic or mottled leaf on the leaves, the plant growth and development are normal, and the plant height is no different from that of healthy plants, which has little effect on yield; There is also a kind of thick and light mottled with large holes on the leaves, and then the new leaves become smaller, the veins turn purple, the leaves are slender and narrow, and the twisted and deformed. The growth of the stem top leaves is stagnant, the plant is short, the lower leaves are mostly roll-shaped, the flower bud differentiation ability of the diseased plant is weak, a large number of flowers and buds have fallen, and the fruit has set fruit, the fruit is small, and the fruit surface is mostly flower-faced. The other is the green virus disease.

The disease is mostly in the tomato after flowering, the main symptoms are yellowing of the upper three or four leaves, of which the parietal leaf is bright yellow, from the second leaf to mottled yellowing, the lower the mottled symptoms are more obvious, and the leaves become thicker, but the leaflet symptoms are not obvious, and the growth of the plant is affected, but it does not stop growing.

There are three different types of tomato leaves, mosaic, potato and shrunken leaves. Among them, the leaves of tomatoes have a larger distance between the leaves and the size of the lobes, while the leaves of the potato leaf type look like the leaves of potatoes, and the leaves of the shrunken leaf type are all shredded. The leaves of the tomatoes are all green and have a slight cover of hairs on the surface.

Tomato leaf shape.

1. Mosaic type:Most cultivars belong to this type of cultivars because of the significant difference in the size of each lobe on the leaf axis of the tomato flower leaf type, and the distance is also large, and the leaves are large and long.

2. Potato leaf type:The potato leaf type of tomato is in the shape of a potato leaf, also known as potato leaf, the leaf is large and long, and the lobes are larger than those of the mosaic leaf type, but the number is small, and the leaf margin is smooth without notching.

3. Shrinkage leaf type: The leaf margin of the shrunken leaves of tomatoes is slightly rolled, the lobes are compact and small, and the leaves are generally shrunken and dark green.

Imitation of the leaf color of the tomato.

The leaves of tomatoes are generally mostly green, with little color in the red, and there are slight hairs on the leaves.

Tomato shape description.

Whole plant:Tomatoes are annual herbaceous plants of the Solanaceae family, mostly with pinnate compound leaves, its leaflets are ovate or rectangular, and the edges of the leaves have irregular lobes.

Flowers:The peduncle is 2-5 cm long, often grows 3-7 flowers, the peduncle is cm long, the lobes are lanceolate, the corolla is radiate, and the color of the flowers is yellow.

Fruit:The berries of tomatoes are oblate or nearly spherical, the flesh contains a lot of juice, the color of the flesh is orange or bright red, the appearance is smooth, and the seeds are yellow.