Tomato ring-rot disease is one of the diseases easily occurring in the growing period of greenhouses and greenhouse tomato cultivation. The victim leaves initially appeared water-stained dark-green lesions that slowly expanded to a nearly circular or irregular shape with concentric ring patterns. In moist conditions, the lesion will grow dark frost. Most of the lesions started from the lower leaves of the plants and gradually developed toward the upper leaves. When severe, the lower leaves wilted and died. Petioles, stalks, and fruit onset were dark brown oval spots at first, slightly sunken after expansion, and black mold and concentric ring patterns appeared. Green disease spots occur from near the calyx. Severe onset, fruit cracking, hard part of the disease. To combat this disease, the main technical measures should be taken as follows;
1. Seed disinfection is soaked in warm water at 52°C for 30 minutes, and then it is spread out on a bamboo plate and then germinated.
2. Use non-toxic soil to grow seedlings For more than two consecutive years, no tomato, pepper and other solanaceous crops have been planted in the soil for seedling cultivation. When the seedlings grow to 8-10 cm, they are transplanted to Daejeon.
3, scientific training pay attention to drainage after the rain, reduce the groundwater level. The plant is planted in a reasonable size, generally about 4000 plants per acre are planted to prevent the density from being too large to facilitate ventilation and light transmission between the rows. Should also strengthen the shed room temperature, humidity control, generally with a temperature controlled at 18-20 °C, air relative humidity controlled at 60-70% is appropriate. In the initial stage of planting, water should be cultivated and watered properly before flowering. After the second round of ear formation, sufficient water should be poured in time to promote fruit development and expansion. Watering should be done after 10 o'clock in the morning on sunny days and be ventilated in time to avoid condensation on the leaves in the morning. In the breeding process of tomatoes, cultivators should also timely cultivate the soil and prevent the collapse of the rod, and timely removal of old leaves, diseased leaves buried deep outside the shed. In the later stage, 5-8 kg of potassium fertilizer is applied per acre to increase the resistance to disease and increase the sugar content of the fruit. Fruit setting can be foliar sprayed with 0.1% sucrose plus 0.2% potassium dihydrogen phosphate, followed by 0.3% urea.
4. Control of pesticide application at the seedling stage. 70% Mancozeb WP can be sprayed and used to prevent and control. The seedlings were planted and transplanted with the drug. When you first see lesions, you can use chlorothalonil, acetaminophen, carbendazim, Dafudan, Bordeaux fluid, and ammonia complexes to prevent and control water spray.
1. Seed disinfection is soaked in warm water at 52°C for 30 minutes, and then it is spread out on a bamboo plate and then germinated.
2. Use non-toxic soil to grow seedlings For more than two consecutive years, no tomato, pepper and other solanaceous crops have been planted in the soil for seedling cultivation. When the seedlings grow to 8-10 cm, they are transplanted to Daejeon.
3, scientific training pay attention to drainage after the rain, reduce the groundwater level. The plant is planted in a reasonable size, generally about 4000 plants per acre are planted to prevent the density from being too large to facilitate ventilation and light transmission between the rows. Should also strengthen the shed room temperature, humidity control, generally with a temperature controlled at 18-20 °C, air relative humidity controlled at 60-70% is appropriate. In the initial stage of planting, water should be cultivated and watered properly before flowering. After the second round of ear formation, sufficient water should be poured in time to promote fruit development and expansion. Watering should be done after 10 o'clock in the morning on sunny days and be ventilated in time to avoid condensation on the leaves in the morning. In the breeding process of tomatoes, cultivators should also timely cultivate the soil and prevent the collapse of the rod, and timely removal of old leaves, diseased leaves buried deep outside the shed. In the later stage, 5-8 kg of potassium fertilizer is applied per acre to increase the resistance to disease and increase the sugar content of the fruit. Fruit setting can be foliar sprayed with 0.1% sucrose plus 0.2% potassium dihydrogen phosphate, followed by 0.3% urea.
4. Control of pesticide application at the seedling stage. 70% Mancozeb WP can be sprayed and used to prevent and control. The seedlings were planted and transplanted with the drug. When you first see lesions, you can use chlorothalonil, acetaminophen, carbendazim, Dafudan, Bordeaux fluid, and ammonia complexes to prevent and control water spray.
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