How to Prevent and Protect Tomato Stripe in Protected Field
The tendon rot disease, also known as strip rot and stripe spot disease, is a common and serious physiological disease in protected areas. To help farmers effectively prevent and control, the author now describes their prevention and treatment as follows:
There are two types of symptoms: brown tendon rot: local browning, even necrosis, unevenness, and firm flesh on the fruit surface. When we cut the diseased fruit, it can be seen that the vascular bundles in the fruit are browned and dead, and sometimes the brown flesh of the flesh has symptoms of necrosis. When the disease is light, the surface of the fruit can sometimes be seen with rough and uneven spots, and the diseased part is poorly colored. At the time of harvest, the fruit surface has obvious green or light green spots, accompanied by hardened pulp and fruit cavity. Brown tendon rot often occurs on the back surface of the fruit, and the fruit of the lower inflorescence has more incidence than the upper one. White tendon rot: Mostly occur in the tissues of the pericarp. The disease department has a wax-like luster, which is hard, and the pulp is heart-shaped. Bad coloring of the diseased area.
The cause of the disease is due to the protection of tomatoes in early or late cultivation, there are protective facilities, can not be a reasonable rotation, the environment and soil temperature is low, mid-night high temperature, high humidity, coupled with unreasonable density, too much nitrogen fertilizer, NPK Imbalances, soil compaction, poor management, etc., caused poor plant growth, and the lack of light during fruit enlargement affected the production of photosynthetic materials and caused brown tendon rot. However, a single factor is difficult to cause morbidity, and there must be a combination of various adverse factors to cause the disease. Brown tendon rot occurs at low temperature and low light conditions. Dense plants, poor ventilation and light transmission are conducive to the disease. Excessive soil moisture and insufficient supply of oxygen in the soil are also conducive to the disease. The amount of fertilizer is too large, especially if ammonium nitrogen is used excessively. If potassium deficiency or absorption of potassium is impeded, the occurrence of the disease is also heavy. The application of farmhouse manure, dense planting, colonization of small seedlings, and strong picking of hearts without adequate maturity may all induce the disease. White tendon rot is usually thought to be caused by tobacco mosaic virus infection. Tomato varieties that are not resistant to the tobacco mosaic virus are prone to white tendon rot.
Precaution
The first is the selection of disease-resistant varieties. The second is the rational close planting, timely pruning, improve ventilation and light conditions, increase light. The second is to prevent flooding when flooding, it is best to use submerged membrane irrigation or drip irrigation, to prevent excessive humidity, to avoid soil compaction. The third is to strengthen the temperature, fertilizer and water management, to prevent the greenhouse temperature is too high, the soil moisture is too dry and wet, the imbalance of nutrient elements and other unfavorable factors cause increased disease. The fourth is to pay attention to the control of aphids and whitefly before and during the growth of tomato, to prevent the occurrence of tomato virus disease, and reduce the appearance of tendons and rot. Fifth, the protection of tomatoes to fertilize light nitrogen, less phosphorus, heavy potassium, calcium and magnesium. Nitrogen, phosphorus, potassium, calcium and magnesium should be applied during fertilization. Topdressing potassium fertilizer should be applied during flowering, fruiting period and fruit expansion. Fertilization should be based on top-dressing fertilizer, mainly organic fertilizer, vegetable-based fertilizer, rational allocation of chemical fertilizers. Do not apply nitrogenous fertilizers to other parts of the plant. To increase phosphorus and potassium fertilizers in tomato fruit, increase plant resistance, prolong light time, apply photosynthetic micronutrients, increase photosynthetic product yield, and transport to fruits. Sixth, to prevent continuous cropping for many years, a rotation system should be implemented to ease the imbalance of soil nutrients. Seventh, the plastic film with strong translucency should be selected for the greenhouse film, and the wide-row cultivation method should be adopted for the greenhouse tomato to increase the transmittance between the rows and promote photosynthesis. Carbon dioxide gas fertilizers need to be added to the greenhouses to meet the needs of photosynthesis. Eighth is timely prevention and treatment. If a diseased plant is found, a mixture of 0.2% glucose and 0.1% potassium dihydrogen phosphate can be sprayed immediately to increase the content of sugar and potassium in the leaves and reduce the hazard.
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