Control measures of tomato yellow leaf curl virus disease

1. Cultivating disease-free and insect-free seedlings is the key. The earlier the disease harms tomato plants, the higher the incidence rate, so the prevention and control should start from the seedling stage, achieve early prevention and early control, and strive to have fewer or no diseases. Weeds around the seedbed should be removed and the soil of the seedbed should be disinfected to reduce the source of the disease. The seedbed is sprayed with 3,000 times of root irrigation agent, i.e. Clematis flavescens B, and then the soil is prepared and covered with 40-60 mesh insect-proof net. 2-3 leaves at seedling stage were sprayed with yellow leaf curl virus vaccine three times a day. Water the seedbed twice with the solution of yellow leaf curl virus B2000 times before planting.

2. Agricultural measures. When planting, the hole water is poured with B2000-3000 times of the solution of Curcuma flavescens L. Wei Ling B, and after seedling extension, it is sprayed every 3-4 days with a solution of Curcuma flavescens L. Wei Ling A 1 bag 1 barrel water. Spray four times in a row. Properly control the amount of nitrogen fertilizer to keep the field moist. Fertilize and irrigate several times, avoid drought and flood, let out the wind in time, avoid high temperature in the shed, adjust the temperature and humidity in the field, increase the application of organic fertilizer, promote the growth and health of plants, improve the disease resistance of plants, spray tomato yellow leaf curl virus 1-2 times when heading, remove weeds and fallen leaves in the field in time, and reduce the source of insects. The air outlet of greenhouse is isolated with 40 ~ 60 mesh insect net, and the yellow hanging board is used to control Bemisia tabaci in the field.

3. Treatment method: If you are not prevented from being infected with the virus in the early stage, please immediately wash your roots with Curvularia flavescens B virus solution with a concentration of B2000-3000 times, and spray Curvularia flavescens A virus or vaccine with a concentration of 1 time for 4-5 times within 3-4 days. If you don't want to irrigate the roots, you can use Huanghuaquyeweiling B, and the dosage per mu is 1000- 1500ml. Stop using auxin, anti-aging drugs and common virus drugs during treatment.

Generally, it is best to use the medicine 3 ~ 4 days after watering, and the spread of the disease can be controlled by using 1 ~ 2 times, and the initial diseased plants can be recovered by using the medicine 3 ~ 4 times, which has no therapeutic significance for the growing points that have stopped growing. If the disease has occurred, root irrigation and spraying must be carried out at the same time, which will take effect quickly and recover well.

Therapeutic effect: 1, only need to be inoculated three times in seedling stage, and the disease-resistant effect can reach more than 90%.

2. After inoculation at seedling stage+planting and root irrigation+delaying seedling, spraying Huanghuaquyeweiling for 4 times, the disease-resistant effect can reach over 96%.

3. Inoculation at seedling stage+planting and root irrigation+spraying etiolated leaf curl virus solution for 4 times+1-2 panicles and strengthening spraying etiolated leaf curl virus solution for 2 times, the disease resistance effect can reach over 99%.

Problems needing attention in treating yellow leaf curl virus disease;

1, the effect of root irrigation is better than irrigation. It is best to water 2000-2500 plants with a bottle of root irrigation agent 1 of 500ml, and water 30 plants with 6-7ml of root irrigation agent mixed with 30kg of water with a syringe, and water 2-3 bottles per mu.

2. It is best not to spray yellow leaf curl virus or vaccine at high temperature, and the effect is best in the morning and evening. It is best to dilute it twice and spray it evenly from top to bottom when dispensing. Generally, water is 30-45kg before flowering, 45-60kg after flowering, 1 mu after flowering, 60-75kg for 1-2 ear and 90kg for 2-3 ear. 1 medicine with 30 kg of water. It has a good effect when used in combination with agricultural silicone additives.

3. Reasons for trimming: (1) may be mixed or used alternately with other foliar fertilizers containing hormones or commonly used antiviral drugs, and the hormone concentration is too high when spraying flowers. (2) It may be that the dosage is small and the spraying is uneven. (3) Failure to take medicine on time.

4. The therapeutic effect of yellow leaf curl virus disease mainly depends on the correct use method and dosage per mu, and the satisfactory therapeutic effect can not be achieved with small dosage and uneven spraying.