Recently, many vegetable farmers encountered tomato root rot. Some vegetable farmers accidentally sprayed and caused unnecessary losses. Plant protection experts reminded you:
Many vegetable growers of tomato recently reported that the tomato plant first appeared wilting gradually in the morning, and the plant returned to normal after the evening, so that the entire plant died after repeated days, and the brown or black necrosis of the root system was found. What caused this disease? How should preventive measures be taken? Sun Zuowen, a senior agronomist at Plant Protection of Shandong Province, issued a prescription for this.
Sun Zuowen said that there are three common root rot of tomato, namely, Phytophthora root rot, Pythium root rot, and Fusarium root rot. All belong to soil-borne diseases. The three root rots are not easily distinguishable by symptoms. In the seedling stage, it will happen. The symptoms of the adult plant stage are as described above. In addition, the mild root rot also shows the gradual yellowing of the bottom leaves, few new capillary roots, weak plant growth, premature aging, and low yield. This condition is easily diagnosed as a deficiency.
He emphasized: “The prevention of root rot is the most important in advance, and when planting, it is the easiest and most effective way to plant stalks (irrigation roots) and spray nests (acupoints), and it can be planted after spraying the nests once. Root rot, leaf spray does not work, it is recommended to root.†It is understood that tomato disease is a collective name, seedling disease, damping-off, late blight, Phytophthora root rot are all homologous. That is, the disease caused by Phytophthora oomycetes. All can be transmitted by soil and water, and all belong to soil-borne diseases. Diseases caused by Phytophthora spp. have obvious characteristics, that is, they spread rapidly, cause serious damage, and partially rot. The most effective way to deal with this type of disease is to prepare in advance and take preventive measures. It should start from the soaking and seedling substrate for seedlings, select the appropriate drug coating or soaking, and spray the seedling substrate after seeding, which can fundamentally eliminate the occurrence of the above diseases.
According to Sun Zuowen, tomato has a more common disease, "stem rot and blight are caused by the same pathogen, namely Rhizoctonia in the semi-known fungus, that is, as long as the prevention and control of blight, stem rot The main feature of stem rot is stem rot in the base or root of the stem, which can cause death of the whole plant in severe cases.Generally, an effective bactericidal drug is selected at the seedling stage for seed dressing or rooting. The prevention of the disease is still not a problem."
“Root injuries are also prone to disease. There are a lot of problems in production, such as premature aging of plants, yellowing of the leaves at the bottom, weak growth, failure to grow trees, etc. This type of problem, the vast majority are attributed to root injuries. Such as soil salinization or self-toxic substances or due to fertilizer damage, the surface performance is a lack of fat and nutrient deficiency symptoms, in fact, the roots are underdeveloped, poor soil fertility, yellow leaves and premature aging occurred.†He explained that since it is a root system If there is a problem with the soil, it is necessary to solve the problem by selecting drugs for irrigation. This method can also be used to irrigate roots of watermelon, melon, bitter gourd, pepper, and beans in early spring. It also has the effects of treating root diseases, salt damage, fertilizer damage, self-toxic substances, and rooting.
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