How about this rotten fruit of tomato and how to prevent it?

Growing tomatoes in greenhouse requires careful care, from seedling stage to harvest. Especially in the mature and expanding period of fruit, rotten fruit is very easy to appear. Once rotten fruit happens, it will not only affect the quality of tomatoes, but also lead to the loss of commercial value of tomatoes. The causes of tomato fruit rot are fungal diseases, bacterial diseases and physiological diseases. Next, I will talk in detail about what causes tomato rotten fruit and how to prevent it.

One is the rotten fruit of tomato caused by fungal diseases.

In the process of tomato growth and development, if tomato has fungal diseases such as anthracnose, Rhizopus fruit rot, late blight and cotton rot, it will cause tomato fruit rot.

1, rotten fruit of tomato caused by anthracnose

(1) rotten fruit symptoms caused by anthracnose

Anthracnose mainly harms mature tomato fruits. At the beginning of the disease, there were water-stained transparent spots, which were black after expansion and slightly sunken with concentric annular spots, and the fruit was densely covered with black spots. When the humidity is high, it will secrete reddish mucus, which will cause tomatoes to rot or fall off.

(2) Prevention and control measures

Remove rotten fruit in time; Strengthen ventilation in the fruit season, and if possible, ventilate day and night to reduce indoor air humidity; Spraying 45% prochloraz EC or 25% bromothalonil EC 1200~ 1500 times every 7~ 10, for 2~3 times. 2. Rotten fruit of tomato caused by Rhizopus.

(1) Symptoms of Tomato Fruit Rot Caused by Rhizopus Fruit Rot

Tomato fruit rot occurs in fruits, especially mature fruits. At first, it showed irregular spots, inconspicuous edges and shriveled pericarp. In the later stage, it can expand to half or the whole fruit surface, showing soft rot, and white or gray cotton-wool hyphae are produced on the surface.

(2) Prevention and control measures

Fruit rot fungus is a weak parasitic fungus, saprophytic, often invading from peel wounds or natural orifices, rainy and humid. Prevention is the key, strengthen field management and pick in time. At the initial stage of the disease, copper hydroxide, carbendazim, difenoconazole and other drugs can be used for prevention and treatment.

3, rotten fruit caused by late blight

(1), the symptom of tomato fruit rot caused by late blight.

The spots on rotten fruits caused by late blight were dark green at first, and then turned into dark brown. The affected part is hard and irregular, and the frozen fruit generally does not become soft. When the humidity is high, a small amount of white mold grows and decays rapidly.

(2), prevention and control measures

Select disease-resistant varieties suitable for local cultivation; 3~4 years rotation with non-solanaceae vegetables. Clean up the countryside, thoroughly remove sick and disabled organizations and properly handle them; Rational application of nitrogen fertilizer and increased application of potassium fertilizer. Prevention and control of flooding and field water accumulation, and timely drainage after rain; Greenhouse planting should be ventilated to avoid condensation or water film on plant leaves to reduce the incidence; Found that the central diseased plants and leaves were cleaned in time and taken out of the shed for treatment; Can propamocarb and nail cream be used? Manganese-zinc, frost urea? Manganese, zinc, wuyiencin, etc. Sprayed in turn; In addition, chlorothalonil can also be used for fumigation. 4, rotten fruit caused by cotton rot

(1), the symptom of tomato fruit rot caused by cotton rot.

Tomato fruit rot caused by cotton rot mostly occurs in fruits near the ground, and the occurrence of fruit cracking in near-ripe fruits is more serious. Brown or yellowish brown spots appear on the fruit, which quickly softens and ferments, so that the whole fruit rots, is covered with tremella layer, and then falls off.

(2), prevention and control measures

Plastic film mulching planting in the border; Reasonable close planting, timely pruning and threshing, enhancing ventilation and light transmission between plants and reducing field humidity; Pay attention to balanced fertilization, especially increase the application of potassium fertilizer; Avoid floods and water accumulation in the fields; Propamocarb, dimethomorph and other agents are selected for spray control in pharmacy department. Second, rotten fruit caused by bacterial diseases of tomatoes

Tomato soft rot is the main disease of tomato fruit rot caused by bacterial diseases.

1, rotten fruit symptoms of tomato caused by soft rot

The rotten fruit of tomato caused by soft rot mostly occurs in the green fruit stage, and invades from the wound caused by insect injury and sunburn. Although the skin remains intact, the pulp decays rapidly, with a rancid smell, and the phenomenon of fruit dropping is aggravated.

2, prevention and control measures

Strengthen field management to avoid fruit injury; Prune and harrow as soon as possible to avoid field work when condensation occurs; Avoid floods and water accumulation in the fields; Control pests, especially cotton bollworm, in time to reduce the wounds caused by insect injuries; The medicine can be selected from clothianidin copper, copper hydroxide, zhongshengmycin, etc. Third, rotten fruit caused by physiological diseases of tomatoes

In the process of tomato growth and development, navel rot caused by calcium deficiency and other factors will also cause tomato rotten fruit.

Tomato rotten fruit caused by umbilical rot

1. Symptoms of tomato fruit rot caused by navel rot

At the beginning of the disease, dark green spots appeared on the navel of tomato fruit, and then turned dark brown. The pulp of infected fruit loses water, the top of tomato fruit is sunken and there is a concentric ring in the center of the spot. When the air humidity increases, the fruit rots to form rotten fruit.

2, prevention and control measures

Selecting disease-resistant varieties for planting; Increase the application of organic fertilizer, increase the soil aggregate structure, and improve the ability of water and fertilizer conservation; Water in time, avoid partial application of nitrogen fertilizer, and spray calcium fertilizer and boron fertilizer on leaves; Keep proper temperature and humidity during mushroom growing to avoid high temperature drying. Although there are many reasons for tomato fruit rot, we can see that most of them are caused by improper field management. Therefore, in the process of tomato planting, in addition to avoiding unfavorable factors such as crop rotation, it is very necessary to carry out meticulous management of tomato planting process. Only in this way can we avoid and reduce the occurrence of tomato fruit rot.