Tomato early blight is also called roteninosis. The pathogens mainly live in the soil with mycelia and subsporidia as the diseased bodies are left in the soil, and they can also adhere to the seed surface for winter. The germs use conidia as the primary invasion and re-invasion body, relying on the air flow to spread through the wound, orifice or epidermis. The disease can be infected in tomato seedling stage to adult stage, and can damage leaves, stems, flowers and fruits. The victim of the fruit started from near the fruit pedicle, and there was an oval-shaped dark depression in the oval. The surface of the lesion grew black mold, the diseased part became hard, the fruit was easy to crack, and it turned red earlier.
Control methods:
1, seed treatment. Before sowing, the seeds should be disinfected and soaked in warm water of 52°C for 30 minutes. Then a new high fat film was used for seed dressing to form a protective film, which could repel the underground pests, isolate the virus infection and increase the seed germination rate.
2. Chemical control. In the tomato growth stage, water and fertilizer should be scientifically managed to meet the needs of tomato growth. In the early stage of the disease, spraying pesticides and adding new high-fat membranes can enhance the efficacy of the drug. At the same time, it can also prevent other fungal diseases.
3, timely removal of diseased leaves, dead branches concentrated deep, at the same time spraying a new high-fat film on the plant to form a protective film to prevent the spread of bacteria, can hinder the penetration of airborne pathogenic bacteria; at the same time in tomato flowering, young fruit, expansion Spraying fruits and vegetables to enhance the quality of fertilized pollen, improve fruit circulation rate, promote fruit development, so that the succession of tomatoes and high yield.
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