Tomato bacterial wilt, also known as bacterial wilt disease, is one of the important diseases of the solanaceous vegetable crops. It is a critical period for tomato flowering and fruit setting. It has an acute onset and rapid spread, often resulting in death of plants and often causing serious reductions in production.
Symptoms Although the seedling stage has infestation, but does not show symptoms, to the fruit set in the early stages of the disease, the diseased plant leaves, the lower part and the middle part have appeared wilting, generally noon obvious, back to normal after the evening. After the onset, if the soil is dry and the temperature is high, the whole plant will wither until it dies after 2 or 3 days. When the temperature is low, even when the rain or soil moisture is high, the diseased plants can be maintained for about 1 week before they die. After the plants died, they were green, so they were called bacterial wilt.
Control methods
Implementing a dumping rotation to avoid tomato replanting, and avoiding continuous cropping with solanaceous crops and legumes, it is advisable to implement a three- to five-year crop rotation with wheat crops, and where possible, the best results can be achieved with grass crops, especially paddy field rotations. . However, it is necessary to adopt disease-free strong seedlings and corresponding cultivation measures in order to receive the desired results.
Selection of disease-resistant varieties such as hybrids No. 1, No. 3, Xia Xing, Fengshun, Kangqing No. 19, No. 3, Xiangyin, Early Resistance No. 1, and so on, suitable for serious disease fields or planted in the epidemic season.
Strengthen the cultivation and management of the site preparation or planting, in the soil sprinkle a proper amount of slaked lime, adjust the pH of the soil to weak alkaline, inhibit bacterial growth and growth; appropriate sowing date, early spring tomato seedlings, early transplanting, autumn tomatoes suitable for late planting, In order to avoid the high temperature season, we can reduce the damage by avoiding the high temperature season; we should choose land plots with high dryness or drainage, deep sorghum cultivation, appropriate control of irrigation, and watering at noon; in addition, planting, fertilizing, cultivating and other agricultural operations All of them have the potential to be rooted, and they must all go to Italy. The farmyard fertilizer used must be decomposed with high temperatures, and phosphorus and potassium fertilizers should be added appropriately to increase the resistance of plants.
The use of pesticides to prevent sporadic disease in the field should be immediately removed and instilled into the cavity with 2% formalin solution or 20% lime water disinfection; 72% agricultural streptomycin or neomycin-containing 4000-fold solution can also be infused into the cavity. Agent "401" 500 times, 50% DT or 60% DTM WP 500 times, 0.5 liters per hole irrigation, irrigation once every 10 to 15 days, and irrigation 2 to 3 times.
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