Timely touch fork There are always some forks in the growth process of tomato. If the fork is too late, it will compete for the nutrition of the plants. If the fork is too early, it will inhibit the development of the underground root system, which is not conducive to the overall development of the plant. Then the tomato touch fork should have a reasonable amount of time. It is more appropriate to remove it when it is 8 to 10 centimeters long. It will neither compete for excessive nutrients nor affect root development. At the same time, attention should be paid to operating on sunny days to facilitate wound healing and prevent disease from invading from the wound, causing the wound to rot. For the fork problem, the same principle applies to other eggplant vegetables, including eggplant, pepper, the same operation method. When the fork is touched, it is not suitable to cause the wound to be too large. In low temperature cultivation (winter and spring cultivation), the wound is likely to infect bacteria and gray mold, so the 3 cm handle can be properly left to prevent the wound from quickly invading the stem when it is rotted. Controlling the leggy The recent response of growers who grow tomatoes is that the seedlings of young tomatoes have just emerged at the seedling stage, but the plant growth is seriously imbalanced. The leaves are thin, yellowish white, and the stems are slender, and the joints are very high, just like the gibberellins used. The effect is almost no fruit and fruit. What's going on here? After a detailed understanding of the experts, the conclusion is that the poor quality of the base of the hormone harm. Farmers often use commodity organic fertilizers and bio-fertilizers when applying basal fertilizers. The reason that tomato seedlings grow too long often appears on these two fertilizers. The reason is that unscrupulous manufacturers have added too much hormonal substances such as gibberellin and sodium nitrophenolate to highlight the growth effect of the product on vegetables. If you encounter this situation and how to solve it? Foliage can be sprayed with Chlorothalon + Potassium dihydrogen phosphate to control plant growth and coordinate the supply of nutrients. The prevention and treatment of roots Roots of tomatoes appear mainly in the seedling stage, if the ground temperature is less than 12 degrees Celsius for a long time, light is weak, and watering is too large. Plants do not produce new roots, and the root epidermis becomes rust-brown, and the root epidermis is easily stripped. In severe cases, rot occurs, resulting in wilting or dead trees. The leaves on the ground are yellow, and the leaves are in the dark, and the growth is extremely slow. Control methods: Control the amount of watering at the seedling stage, spray rooting agent at a proper time, and promote the development of the root system; spraying chitin, alizarin and other conditioners on the foliage to enhance plant resistance. Prevention of damping-off at seedling stage Tomato seedling phlegm disease symptoms: cataplexy falls mainly divided into the emergence of seedlings, rotten seedlings, seedlings stumble. The post-emergence infestation is mainly in the early stage of seedling growth. It mainly damages the base of seedling stems on the roots and on the ground, and the seedlings fall down. The incidence is very fast and the seedlings die. Causes of the disease: The main causes of the disease are low temperature and high humidity, lack of light, excessive sowing, excessive use of nitrogen fertilizers, and soil bacteria on the nursery beds. Control methods: can be sprayed with an agent of nausea, refined metalaxyl MnZn, and Precore to prevent and cure. Blight and stem rot control Tomato blight and stem rot pathogens are consistent, are Rhizoctonia solani. Blight mainly damages the seedlings on the seedbed, resulting in dark brown spots on the base of the stems. It then causes the cortex to rot, and the diseased part shrinks and dries, but it does not harm the xylem, so the seedlings stand dead, and when the humidity is high, the diseased part has no obvious paleness. Brown spider silk mold. Stem rot: Major damage to large seedlings after planting of tomatoes. Dark brown lesions appear on the bases of the stems above and below the surface of the ground. After the base of the stems expands, the cortex of the disease rots. The cortex dies after one week of the stem. When the humidity is high, the diseased part appears shallow. Brown spider silky mildew layer or appear brownish brown, small sclerotia of different sizes. Both types of diseases can cause dead trees at the later stages of disease development. Therefore, they must be prevented and treated as soon as possible, and are often severely affected as a soil-borne disease. Control methods: At the beginning of the disease, the agent can be selected as: thiophanate-methyl + hymexazol or multi. Control of Pythium Stalk Rot Pythium cinerea stalk rot caused serious damage in recent years, mainly harm tomatoes just in the slow seedling period, high temperature and high humidity prone to disease, commonly known as "stem blight," the root system is not harmful, but with the development of the disease, will cause Dead tree. The main hazards are about 2 to 3 cm above and below the surface, resulting in dark brown lesions that gradually expand upwards, and after one week around the stems, the lesions turn brown, soften, and contract. High temperature and high humidity are the main causes of morbidity. During late fall and summer planting, the damage is severe. If the larvae are too large and the outside temperature exceeds 30 degrees Celsius, the disease will be greatly affected. Control methods: available toxins, fluoride, B-aluminum, fine metalaxyl manganese zinc irrigation or spray stem base.
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