Tomato rot disease fertilization prevention measures
In the fruit with mild symptoms, some of the vascular bundles became brown and necrotic. Although the shape of the fruit did not change, the vascular bundle did not turn red. In severely diseased fruits, the vascular bundles of the flesh were dark brown in all, and the placental tissue of the diseased fruit was poorly developed. The surface of the fruit was unevenly colored. In severe cases, the diseased part was pale green and the surface became hard.
Analysis of the most important symptoms of tomato tendon rot is poor fruit coloration, and lack of light, NPK imbalance, root injury can cause poor fruit coloring, so it can be concluded that the cultivation conditions are unwell. If the shade net covers the whole day, it will cause insufficient light. The shade net can be covered only in the sunny noon, and it should be removed in the evening and rainy days in order to ensure the tomato's visibility time and light intensity. In addition, if the proportion of nitrogen and potassium is not adjusted during fertilization, the amount of potash fertilizer required during tomato fruiting period will be large, about 1.8 times that of nitrogen fertilizer. When topdressing, the amount of nitrogen fertilizer is too large, potassium fertilizer is insufficient, and the incidence of tendon rot is high. In addition, frequent application of manure has also increased the occurrence of the disease.
Prevention and control of tomatoes in greenhouses that have been afflicted with rot, can be applied with 200-300 times more potassium dihydrogen phosphate on the foliage, or 500-1000 times more foliar fertilizer, or aromatic leaf fertilizer under enhanced light conditions. 800 ~ 1000 times fluid, rapid nutrient addition, reduce the risk of late tendon rot fruit.
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