Control techniques of Tomato Fusarium Wilt

Tomato Fusarium wilt mostly occurs in the flowering and fruiting period of tomato, and the whole plant shows the disease. at the initial stage of the disease, only the lower leaves of the plant turn yellow, but most of them do not fall off. with the development of the disease, the diseased leaves turn yellow and brown from bottom to top, except for several pieces at the top. the rest are necrotic or scorched, and sometimes the leaves on one side of the diseased plant droop and the leaves on the other side are still normal. Let's take a look at the prevention and control techniques of tomato Fusarium wilt.

Harmful symptoms of tomato Fusarium wilt

Tomato Fusarium wilt is a kind of soil-borne vascular disease which is difficult to control, which is often complicated with bacterial wilt, often occurs in the flowering and fruiting stage, and often dies in the full fruit stage. In the early stage of the disease, the middle and lower leaves of the plant wilted around noon, and recovered in the morning and evening, and then the wilting symptoms gradually aggravated, and the leaves gradually turned yellow from bottom to top, and did not fall off until they withered. Sometimes the disease occurs only on one side of the plant, and the stems and leaves on the other side grow normally. The base of the stem is immersed near the ground, and pink, white or turquoise mildew is produced when high humidity is high. Pull out the diseased plant, cut the base of the diseased stem, and the vascular bundles turn brown.

Pathogenic factors of tomato Fusarium wilt

The main results are as follows: 1. In the continuous cropping land, the soil is heavy and sour, and there are many Fusarium wilt bacteria in the soil.

2. There are a certain amount of nematodes and other underground pests in the soil, and the germs invade the roots from the wounds harmed by the pests.

3. Nutritious soil-borne bacteria for breeding seeds and seedlings. Or organic fertilizer carries bacteria, or organic fertilizer is not fully mature, dung maggots harm the roots, and germs invade from the wound.

4. The fields with excessive application of nitrogen fertilizer and insufficient phosphorus and potassium.

5. After continuous rain or heavy rain, the temperature suddenly cleared up, and the temperature rose rapidly. Sometimes sunny and sometimes rainy, hot and muggy weather.

Control techniques of Tomato Fusarium Wilt

1. Remove weeds in and around the field before transplanting or after harvest, and concentrate on burning or retting fertilizer. Turn the ground deeply to kill stubble and sun up the soil, promote the decomposition of the disease and reduce the source of disease and insect.

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. Seriously diseased fields are rotated with cruciferous vegetables, melons, onions and garlic for 3-5 years. If cucumbers are planted, black-seeded pumpkins must be grafted.

4. choose disease-free, coated seeds. If uncoated, the seeds should be sterilized with seed dressing agent or seed soaking agent.

5. Cover with medicine and soil after sowing, and spray insecticide and fungicide before transplanting, which is the key to disease prevention.

6. Open the drainage ditch and lower the groundwater level so that there is no stagnant water in the rain. Cleaning the gully system in time after heavy rain to prevent moisture retention and reduce field humidity is an important measure to prevent disease.

7. For fields with many soil germs or serious underground pests, apply sterilized and insecticidal soil before sowing or furrow.

8. Compost retted by enzyme bacteria or rotten organic fertilizer shall not be used with bacteria, and the organic fertilizer shall not contain disease residues of undergraduate crops.

9. Turn the soil deeply and increase the application of organic fertilizer, phosphorus and potassium fertilizer to promote the healthy growth of crops and improve their disease resistance.

10. 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.

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