Tomato Disease Pictures and Prevention

Tomatoes , also known as tomatoes, are very common fruits and vegetables. They are rich in nutrients, have a refreshing taste, and are deeply loved by people. Tomatoes are prone to many diseases if they are not managed properly. Let’s take a look at the pictures and prevention of tomato diseases below.

1. Viral diseases

The typical symptoms of tomato virus disease are yellow-green necrotic spots on the leaves, accompanied by curling, wrinkling, twisting, and even turning into linear leaves. The plants become dwarfed, yellow, and do not bear fruit when they bloom; the fruit becomes internally necrotic or black-hearted.

Prevention and control methods : To prevent and control tomato disease virus, adopt comprehensive prevention and control measures with agricultural prevention as the main method and pesticides as the auxiliary method. To prevent aphids in the early stage, take advantage of aphids' tendency to move toward yellow and use yellow sticky boards to lure and kill aphids.

2. Botrytis cinerea

When the fruit is infected, green fruits are severely affected. The remaining stigma or petals are usually infected first, and then the disease spreads to the fruit surface or petiole, making the fruit skin appear grayish white and soft, and a large amount of gray-green mold grows on the diseased area.

Prevention and control methods: In the early stage of the disease, spray with 700 times diluted Green Henry No. 5 or 1000 times diluted Green Henry No. 6 or Huibike or Green Henry 2.1% clove and carvacrol or Green Henry 70% pyrimethanil 1000 times diluted.

3. Bacterial wilt

The plants with bacterial wilt begin to show symptoms, first the top leaves wilt and droop, then the lower leaves wilt. In the early stage of the disease, the diseased plants wilt during the day, and recover in the evening with the diseased leaves turning light green. When the humidity is high, patches with a diameter of 1-2 cm can be seen on the diseased stems, which are initially water-soaked and then turn brown. The vascular bundles of the diseased stems turn brown. If the diseased stems are cut crosswise and squeezed by hand or moisturized, white bacterial fluid will overflow from the vascular bundles on the cut surface. The disease progresses rapidly, and severely diseased plants die after 7-8 days.

Prevention and control methods: In the early stage of the disease, spray the leaves with 1000-1500 times diluted Green Heng No. 6 or 800-1200 times diluted 86.2% cuprous oxide, once every 7-10 days, and spray 2-3 times in a row.

4. Late blight

When the seedlings are infected, the lesions spread from the leaves to the main stem, making the stem thinner and dark brown, causing the whole plant to wilt or fall over. When the humidity is high, white mold will grow on the surface of the diseased part. When the leaves are infected, the disease often starts from the tip or edge of the leaf at the bottom of the plant. Initially, they appear as dark green, water-soaked, irregular lesions, which turn brown as they expand. When the humidity is high, white mold grows on the back of the leaves; the spots on the stems appear black-brown and rotten. Fruit infection mainly occurs on green fruits. The lesions are initially dark green and oily, and then turn dark brown to tan. The fruit generally does not become soft. When the humidity is high, a small amount of white mold grows on it and it rots quickly.

Prevention and control methods: Spray the leaves with 500-1000 times solution, 1500-2000 times solution of 50% oxadiazine or 400-500 times solution of 90% fosetyl aluminum in Greenheng before or at the early stage of the disease, once every 7-10 days, for 2-3 times in a row.

5. Cataplexy

Damping-off disease is a fungal disease and is the main disease in the seedling stage. In the early stage of the disease after the seedlings emerge from the soil, water stains appear at the base of the stem, which turn brown as the disease develops. The cotyledons of the dead seedlings remain green and do not wilt.

Prevention and control methods: In the early stage of the disease, you can spray 600 times diluted 30% metalaxyl and carbendazim, or 500 times diluted 58% metalaxyl·mancozeb wettable powder , or 600 times diluted 75% thiophanate-methyl wettable powder, or 500 times diluted 70% mancozeb wettable powder for prevention and control. You can also use 500 times diluted solution of Orlike-Sorboc for spraying or root irrigation for prevention and control.

6. Scab

Scab is a disease caused by fungi that is more likely to occur in the early stages of tomato growth. The main symptom is the appearance of black or brown sunken spots on the surface of the fruit, which in severe cases can cause the fruit to overripen and rot.

Prevention and control methods: In the early stage of the disease, use 500 times of 77% methacrylic acid wettable powder, or 400 times of phytosylvinia, or 400 times of 72% agricultural streptomycin soluble powder, or 300 times of 25% copper chloramine aqueous solution. You can also use 1:1:200 Bordeaux mixture for spraying, once every 7 to 10 days, and spray 2 to 3 times in a row. The prevention and control effect can reach 80% to 90%.

7. Spot disease

Leaf spot is one of the common diseases of tomatoes, which is mainly manifested by the appearance of round or irregular gray-white spots on the leaves. In the later stage, the center of the spots will fade or crack. The occurrence of tomato spot disease is related to hot and humid climatic conditions and is easily spread in a humid environment.

Prevention and control methods: In the early stage of the disease, spray 400 times diluted copper sulfate suspension (Green Debao), or 1000 times diluted 50% carbendazim wettable powder + 1000 times diluted 75% thiophanate-methyl wettable powder, once every 10 days, for 2-3 times in a row.

That’s it