Agricultural techniques guide the common root diseases and prevention measures of tomatoes. There are three kinds of tomato root rot, namely, Phytophthora root rot, Pythium root rot, and Fusarium root rot. All belong to soil-borne diseases.
First, root rot and its prevention
The three root rots are not easily distinguishable from each other in symptoms and occur at the seedling stage. Symptoms of the adult plant stage are as described above. In addition, the slight root rot is also characterized by the gradual yellowing of the bottom leaves, and the few fresh capillary roots. , Plant growth is weak, premature aging, low yield, this condition is easily diagnosed as a deficiency of the disease. The prevention of root rot is the most important in advance. When planting, smashing the stalks (irrigation roots) and spraying stalks (holes) is the easiest and most effective way. Now, two formulas are provided for the growers to choose.
First, Amixida 1 pack (or Ami Miao received 1 package) / against 1 sprayer water, 500-800 strains of seedlings. After spraying the nest with the above agents, it can be planted.
The second is Jin Lei 35 grams / to 1 sprayer water plus music 10 grams, seedling tray and spray hole nest, the method is the same as above. Of course, if the root rot occurs in the adult plant stage, leaf spray is not effective, and agricultural technicians recommend using the above medicine to root.
Second, the epidemic and its prevention
The epidemic of tomato is a general term. The seedling disease, damping-off disease, late blight disease, and Phytophthora root rot are all homologous. The disease caused by the phytophthora Oomycetes can be transmitted by soil and water. It belongs to soil-borne diseases. Diseases caused by Phytophthora spp. have obvious characteristics, that is, they spread rapidly, cause serious damage, and partially rot. As the most effective method for this type of disease is to prepare in advance, take preventive measures, should start from the soaking seedlings, nursery substrate, such as with clodromycin (Cola) coating or soaking, fine arsenic Subsequent spraying of seedlings with Zinc (Gold) or Ami-Silda eliminates the occurrence of these diseases. If the method of seedling trays and burrow nests is adopted, at least it will ensure that this type of disease will not occur before the full fruit period.
Third, stem rot and its prevention
Tomato 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 is not available. The main feature of stem rot is the brown rot of the base or root of the stem, causing death of the whole plant in severe cases. Although there are many effective drugs for these two diseases, the drug with good effect, no resistance and relatively novelty should be fludioxonil (Changhe Shi). As long as seed dressing or rooting once at the seedling stage, the prevention of the disease is still Not a problem. Of course, as the most widely used bactericidal spectrum, Amisida is an ideal drug for comprehensive prevention and control of fungal diseases in the soil.
Fourth, root injury
There are many problems in this type of production, such as premature plant aging, yellowing of the leaves at the bottom of the leaves, weak growth, and no trees. The agricultural technicians believe that most of the problems that fall into this category are attributed to root injuries, such as soil salinization or self-toxic substances or fertilizers. The deficiency of fertilizers is only a superficial phenomenon. If the root systems are well developed, the soil fertilizers are good and will not occur. Yellow leaf and premature aging phenomenon, since it is a root system, the soil has a problem, it is necessary to solve the problem through irrigation. If the growth of cucumber is very weak, premature yellow leaves, use Ami-Celta 1 pack/barrel + naphthalene acetic acid 3 ml + love to collect 5 ml twice to make the cucumber rejuvenate, the bottom of the leaves becomes big again green. Similarly, this method is used to irrigate roots of watermelons, melons, bitter gourds, peppers, 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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