As a result of continuous crop failure, plant death before and after planting has become a major problem in vegetable production, especially for solanaceous vegetables such as peppers and tomatoes. In addition to the current high temperature and high humidity, plant growth is poor, and the phenomenon of dead plants frequently occurs.
Therefore, it is recommended that vegetable growers replace the new shed film before planting to ensure that there is no leakage of rain in the rainy shed. This can effectively reduce the occurrence of dead plants. Shed film spray greenhouse spray cooling agent or cover the shade net, open the vents on both sides of the greenhouse and set up insect nets, try to minimize the temperature of the greenhouse. In addition, in the application of base fertilizer with the application of bio-fertilizer, such as fertilizer field, heavy eb, ebony, etc. can effectively improve the soil environment, promote slow seedlings. It can also be applied to Xiangnong 4 at the time of planting (1 kilogram per acre) to prevent death.
Viral disease, high temperature, drought is the primary condition for disease. Appropriate pathogenic temperature of virus disease is between 38°C and 43°C. Below 35°C or above 45°C, it is not conducive to disease occurrence. In the daily cultivation and management, artificially controlling the temperature can be beneficial to avoid disadvantages. The specific measures are as follows:
1. Watering in time: From the seedling colonization to the mid-term of fruit setting, the surface of the shed should be kept moist, the surface water content should not be less than 75% to 80%, and the air humidity in the shed should not be less than 70%.
2. Temperature control: take the shed film at night (under no rain at night), and manage the shading and sheltering at noon, especially when the light intensity at noon is high. The main purpose is to ensure that the air in the shed has a high moisture content, and reduces the evaporation of water, ensuring that the leaves and growth points of the plants are not wilted by the transpiration of water, and the leaves of the plants on both sides of the wind outlet are prevented from drying out due to strong light. The main approach is:
(1) Using a hand-pressure sprayer or a motorized sprayer to promptly apply the leaf spray for replenishment.
(2) Use the shade nets for physical control. Normally, a sunscreen is pulled at 10 o'clock in the morning every day, and light is opened after 5 o'clock in the afternoon, which can effectively control the occurrence of viral diseases.
3. Chemical Control: Preventing viral diseases It is recommended that two formulas be available: 25 mg for disease resistance, 15 for medical virus, 15 for fertility, 15 mg for natural harvest, 2.5 g for natural nutrient, and 15 kg of water to spray the plants; The formula is: Harvest No. 1 15 ml plus medical virus Ling 15 plus agricultural streptomycin 3 g plus zinc sulfate 50 g plus naphthalene acetic acid 20 ppm Spray 15 kg of water on the plants.
Bud Blight Bud Blight is a kind of physiological disease, which is affected by the climate. High temperature and drought are the main factors of the disease. Symptoms are: growth point growth was significantly inhibited, was spherical, the first inflorescence leaves rapid lateral growth, branches and leaves hypertrophy.
The following prevention measures can be adopted,
(1) Use shade nets to avoid strong light. The method is the same as the physical prevention and treatment of viral diseases.
(2) Regulation method: Use 920 growth regulator 1g to water 35kg, and spray evenly on the top of the plant. The cure rate is above 95%.
(3) The fungicide can be applied at the same time with 800 to 1000 times of harvester No. 1 conditioner, which can promote plant growth, increase its comprehensive resistance, and reduce the occurrence of the disease.
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