How to prevent and control bacterial wilt in tomatoes? A detailed guide to practical techniques
Hello, Teacher Wan
What is the most effective medicine to treat bacterial wilt in cherry tomatoes?
Name: Ma Ronghai Unit: Farmer Contact phone: 13471638971
Answer: Comrade Ma Ronghai:
Hello, the prevention and control techniques for tomato bacterial wilt are as follows:
1. Crop rotation: Rotate tomatoes with gramineous crops, cruciferous crops, liliaceous crops, and cucurbit crops for more than 2 to 3 years. The best effect is rotation between paddy and dryland crops, such as with rice. Do not grow tomatoes continuously on the same plot with eggplant, chili pepper, potato, peanut, or leguminous crops.
2. Apply quicklime to adjust the pH value: Apply 150—200 kg of quicklime per mu by broadcasting in the field to make the soil acidic and worsen the living environment of the pathogen.
3. Strengthen field management: Promote planting on high ridges, open the three ditches well, make the border ditch, middle ditch, and surrounding ditch connected, make drainage and irrigation convenient, apply more decomposed organic fertilizer, and ensure a balanced combination of nitrogen, phosphorus, and potassium to improve the disease resistance of the plants.
4. Chemical control
(1) Eliminate underground pests and nematodes: In plots where underground pests are rampant and tomato root-knot nematodes occur severely, eliminate underground pests and nematodes to reduce damage to the roots by pests and nematodes and avoid pathogen infection. Apply 2 kg of 3% phoxim granules per mu into the soil for control. Alternatively, after transplanting the plants, drench the root area with abamectin solution.
(2) Lime nitrogen soil disinfection method: The chemical name of lime nitrogen is calcium cyanamide, trade names include Shengtai soil purifying agent and Longbao, and it is commonly known as black fertilizer. Lime nitrogen is a soil fungicide used as both pesticide and fertilizer. Lime nitrogen itself is alkaline and can adjust soil pH. When applied to the soil and meeting water, it produces cyanamide and dicyandiamide, which are very good fungicides. At the same time, lime nitrogen is also a slow-release nitrogen fertilizer, containing about 20% nitrogen and 42-50% calcium. After application to the soil, due to the increase in calcium, the soil aggregate structure is improved. After lime nitrogen is applied to the soil, it can effectively kill fungal diseases, bacterial diseases, root-knot nematode disease, and other soil pests in the soil, and at the same time can alleviate soil compaction and acidification, with very remarkable effects. Application method: During July-August, under high temperature conditions, after rice harvest, first plow the field and break up the soil and make ditches. Use about 130 jin of lime nitrogen per mu together with the organic fertilizer needed for the next crop and apply them into the ditch. Then backfill the cultivated soil from both sides of the ditch onto the ditch and make it into ridges. Then cover with plastic film and seal it tightly. Finally, irrigate to make the soil moist, keep it sealed for 15-20 days, uncover the film and air it for 5-7 days, then directly plant the next crop without applying other fertilizers.
(3) Medicinal root drenching: Method 1: Use 2 packets of Qingku Kuiyangling, 5 packets of Dexon, 30 packets of agricultural streptomycin, 2 packets of carbendazim, and 6 packets of salt per mu, mix with 1000 to 1200 kg of water for drenching. Apply once every 7 to 10 days, for 2-3 consecutive drenchings, with good results. Method 2: Drench the root area with 600 times dilution of 77% Kocide 101 micron powder, or 500 times dilution of the antibacterial agent “401”, or 1:1:200 Bordeaux mixture. Or drench the roots with 2500 times dilution of 40 packets of 72% agricultural streptomycin and 800 times dilution of copper oxychloride. Or drench the roots with 2000 times dilution of special-effect bactericide king, 400 times dilution of Dexon, or 600 times dilution of Qingkusan.
The above content is for reference only.
[Expert][Wan Mingchang]