Tomato rot, also known as strip rot or rot, has generally occurred in the local area in recent years. If it is not prevented in time, it will cause great economic losses to vegetable farmers. It mainly harms the fruit. First, symptoms: There are two common types: First, browning type. Local browning occurs on the fruit surface during hypertrophic growth. The fruit surface is uneven and the fruit is dark brown or has necrotic spots. The vascular bundles in the pericarp of the cut fruit show a dark brownish necrotic, hardened fruit or browned pulp. Loss of commodity value. The second is the white variant. Mainly occurs in the ripe fruit turn red period, the disease is uneven coloring of the fruit, the disease has a wax-like luster, cut open fruit can be seen in the fruit was "squeaky" shape, the vascular tissue of the pulp was dark brown, the incidence of light changes The brown part does not turn red, the flesh hardens, and the quality is poor, pale and tasteless. The heavier fruit flesh vascular bundles are all dark brown and the fruit forms a cavity. The disease is generally not easy to see symptoms from the stem and leaf performance. Second, the cause: This disease is a physiological disease. The degree of morbidity is related to the variety and light time and intensity, the ratio of nitrogen, phosphorus, and potassium in the soil. It is also related to soil conditions and the degree of human fecal urine decomposition. In case of weak light production, long production time, imbalance of nitrogen and potassium in the soil, partial application of nitrogen fertilizers may result in insufficient potassium, especially if the ammonium nitrogen is too much to cause tendon rot. Soil moisture content is too high, soil permeability is poor, and the use of unfamed human urine is heavy. Third, control methods: 1, selection of disease-resistant varieties. 2, scientifically determine the sowing and planting period. Pay attention to reasonable rotation to alleviate the imbalance of soil nutrients. 3, increase the use of fully cooked organic fertilizer, especially bio-organic fertilizer, so that balanced fertilization, is strictly prohibited excessive application of ammonium nitrogen fertilizer. After fruit set, multiple composite micronutrients (boron, calcium, iron) were applied, once every 15 days for 2—3 consecutive times. Keep the soil moisture right, drain it in time after the rain. 4, improve management. Appropriately sparsely planted, increase the light transmittance between lines, strengthen the ventilation between the lines, and improve lighting conditions. In the low temperature, weak light when spraying potassium dihydrogen phosphate. Promote the use of multiple compound liquid fertilizer, and other foliar fertilizers such as love more income, etc., once every 7 days, continuous 3 --- 4 times.
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