Introduction to Control techniques of Tomato Fusarium Wilt

Tomato is a kind of nutritious food with special taste, which can be eaten raw or cooked, and can be processed into all kinds of food. Tomato is planted in many places in China, and it is one of the vegetables that do not have high requirements for the environment. Tomato Fusarium wilt is a disease that is very easy to occur in the process of tomato growth. let's take a look at the key points of the control techniques of the disease.

Symptoms of tomato Fusarium wilt

Tomato Fusarium wilt has a long course of disease, colonization began to infect, mostly from the root tip, until before and after flowering began to show symptoms, after showing symptoms can still survive for a long time, generally 15-30 days before dying. In the early stage of the disease, the lower leaves withered and fell off in large quantities, the basal cortex of the stem in contact with the surface was flooded, and the aboveground stems and leaves withered rapidly; sometimes the diseased part developed only on one side of the stem, forming a longitudinal strip necrotic area, resulting in one side of the leaf yellowing, browning and then withering; some half of the leaf sequence or half of the leaf turned yellow. The underground root system of the diseased plant also showed water-immersed soft rot, the cortex was easy to peel off, and the xylem turned dark brown to soot color. Under the condition of high humidity, the disease produces pink mildew layer, that is, conidiophores and conidia of the pathogen. After the tomato hanging fruit, the plant growth became weaker, the nutrition consumption was large, the plant overdraft was serious, and the symptoms of Fusarium wilt began to appear.

2. the cause of tomato Fusarium wilt.

The pathogen of tomato Fusarium wilt is tomato Fusarium oxysporum tomato specific type, which belongs to semi-known fungi. The diseased stem carries 100% bacteria, and the pathogen passes from the diseased stem through the fruit stem to the fruit through the catheter, and then spreads to the seed with the fruit rot, causing the seed to carry bacteria, or the mycelium or chlamydospore can overwinter in the soil with the diseased residue. Pathogens generally invade the host from young roots or wounds, enter vascular bundles, block ducts, and produce Fusarium oxysporin, resulting in yellow and dead leaves of diseased plants. Germs can spread through water or irrigation water. The specific causes of the disease are as follows:

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. Nutritive soil bacteria for seed and seedling cultivation, or organic fertilizer with bacteria, or organic fertilizer is not fully mature, dung maggots harm the roots, and germs invade from the wound.

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

5. Suddenly clear up after continuous rain or heavy rain, and the temperature rises rapidly; or sometimes sunny and sometimes rainy, hot and muggy weather.

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

1. Agricultural control measures: one is to plant grafted seedlings. Strengthening the ability of disease resistance is the best measure and the first choice to prevent Fusarium wilt. The second is reasonable rotation. Rotation with non-family crops for more than 3 years, or rotation of flood and drought. The third is to promote the basic application of bio-organic fertilizer. Sterilize with bacteria.

2. Root irrigation with medicine solution to prevent disease: the time should be controlled in the same day after transplanting and in the early stage of flowering. The medicament can choose 150 times solution of Chongzhiling or 500 times solution of 20% thiazole zinc suspension, 250 ml per plant.