What are the symptoms and control methods of tomato virus disease?

Tomato is one of the common vegetables in our daily life, which is deeply loved by people because of its rich nutrition, and the planting area is also very extensive. In the specific planting process, it is easy to produce tomato virus disease. What are the symptoms of the disease? How to prevent and cure it? Let's take a look.

I. symptoms of tomato virus disease

1. Tomato field symptoms: there are a variety of tomato field symptoms, including mosaic type, stripe type and fern leaf type, giant bud type, curly leaf type, yellow top type and so on.

2. Common symptom types: mosaic type, stripe type and fern leaf type are common symptoms of tomato virus disease, among which stripe virus has the greatest effect on yield, followed by fern leaf virus.

2. Prevention methods of tomato virus disease

1. According to the main local virus sources, disease-resistant varieties were selected according to local conditions.

2. Carry out virus-free seed cultivation and production. Soak the seeds in clear water for 3-4 hours before sowing, then soak them in 10% trisodium phosphate solution for 40-50 minutes, rinse with clean water and then sow the seeds, or soak the seeds with 0.1% potassium permanganate for 30 minutes. The planting land should select fields that have not planted tomatoes or have no tomato virus disease, and the fields that have occurred tomato virus disease must be turned over deeply to promote the decay of the remains with the virus, and the conditional application of lime to passivate the tobacco mosaic virus on the disease remains in the soil.

3. Implement crop rotation, avoid intercropping and continuous cropping, reduce and avoid the transmission of tomato virus disease soil and residues, and reduce the occurrence of tomato virus disease; seedling land and planting shed land should thoroughly remove poisonous weeds and reduce the virus source of virus disease; popularize the technology of formula fertilization and spray growth regulators to enhance host disease resistance.

4. Disease prevention measures of tomato cultivation:

First, sowing at the right time, cultivating strong seedlings, appropriate seedling age, planting with buds, but not aging.

Second, timely and early planting, promoting the early development of strong seedlings, using plastic shed cultivation to avoid the disease period in the field.

Third, early and middle ploughing and weeding, timely cultivation of soil, promotion of hairy roots, late branching, early harvest, planting and slow seedling spraying of 1/10000 Zengyangling can improve the resistance to mosaic virus. The first ear should be watered in time during the fruit setting period. After fruit setting, attention should be paid to the mixed use of manure and chemical fertilizer to promote strong fruit and seedlings, especially in high temperature and dry season, and attention should be paid to improving the field microclimate.

5. Spray control in the early stage of the disease.

Spraying protection began at the initial stage of the disease (5-6 leaf stage). Jinbeis3 + Ningnanmycin, octylamine, morpholinidine ethyl copper and other agents could be sprayed on the leaf, and sprayed once every 7 days for 3 times in a row. The control effect on tomato virus disease can reach about 80%. In addition, growth regulators such as brassin and trace elements can be added to improve disease resistance and enhance disease resistance.

6. Early control of aphids and whitefly

Using imidacloprid, imidacloprid copper and other piercing and sucking mouthparts pests to kill weeds and poisonous aphids and whitefly on surrounding vegetables as soon as possible in tomato nursery and planting land, to put an end to the transmission of insect vectors such as aphids and whitefly, especially in high temperature and drought years, which can effectively prevent TMV infection and reduce the occurrence and harm of tomato virus disease.