Which parts are mainly damaged by tomato Fusarium wilt? Main points of prevention and control techniques attached

If the tomato grows smoothly in the process of planting, the fruit will be brightly colored and larger. However, in the specific planting process, diseases are often caused by some reasons, especially tomato Fusarium wilt is very common, which parts of tomato Fusarium wilt are mainly harmed? The main points of prevention and control techniques are attached.

Which parts are mainly harmed by tomato Fusarium wilt?

Fusarium wilt of tomato mainly harms the vascular bundles of stem and begins to occur at the flowering or fruiting stage of crops. At the beginning of the disease, the lower leaves of the plant began to yellowing and developed upward, and the middle and lower leaves of the plant were brown and wilted at noon and returned to normal sooner or later. With the development of the disease, more leaves in the middle and upper parts of the plant began to wilt, but did not fall off. Finally, the leaves of the whole plant wilted and yellowed, and the whole plant died. The disease sometimes occurs only on one side of the stem, or yellowing on one side of a leaf and normal on the other. The vascular bundles of stems, petioles and fruit stalks were all brown. Pink mold is produced at the base of the stem of diseased plants in a humid environment. The diseased plant died after 15-30 days, and there was no milky mucus outflow, which was different from bacterial wilt.

2. Key points of control techniques of tomato Fusarium wilt.

1. Select disease-resistant varieties, disease-free and coated seeds. If uncoated, the seeds should be sterilized with seed dressing agent or seed soaking agent.

2. The nutritious soil for raising seedlings should choose aseptic soil and be exposed to the sun for more than three weeks before use.

3. Crop rotation, seriously diseased fields and cruciferous vegetables, melons, onions and garlic rotation for 3-5 years, if cucumbers are planted, black-seeded pumpkins must be grafted.

4. Before transplanting or after harvest, remove weeds in the field and around, concentrate on burning or retting fertilizer, turn the ground deeply to kill stubble and sun up the soil, promote the decomposition of disease and residue, and reduce the source of disease and insect. Seedling transplanting, covering with medicine and soil after sowing, and spraying insecticide and fungicide before transplanting is the key to disease prevention.

5. Select the fields with convenient drainage and irrigation, open the drainage ditch, lower the groundwater level so that there is no stagnant water in the rain; clean the ditch system in time after heavy rain to prevent moisture retention and reduce the humidity in the field, which is an important measure to prevent disease.

6. For fields with many soil germs or serious underground pests, apply sterilized and insecticidal soil before sowing or furrow. Compost made by enzyme bacteria retting or mature organic fertilizer shall not be used without bacteria-carrying fertilizer, and the organic fertilizer shall not contain disease residues of undergraduate crops.

The deep drying of the soil and the application of organic fertilizer, phosphorus and potassium fertilizer can promote the healthy growth of crops and improve their disease resistance.

7. Timely control of insect pests, reduction of plant wounds, reduction of pathogen transmission; timely removal of diseased leaves and diseased plants, and burning out of the field, application of medicine or quicklime at disease points.

8. It is effective to use wild eggplant, poisonous eggplant or red eggplant as rootstock, cultivated eggplant as scion and split grafting method to prevent disease.