Insect pests, seedlings, locusts, crickets, and other underground pests occur in large numbers, causing harm and causing dead seedlings. Prevention and control measures: 80% of dichlorvos emulsifiable concentrate 1000 times watering seedbed bed soil surface, can prevent earthworms; with 80% dichlorvos emulsifiable concentrate 100 times or 50% phoxim EC 50 times mixed crushed and fried bean cake, wheat bran and other systems Poison baits can be sprinkled on the soil surface of the seedbed to kill crickets. The use of 50% phoxim EC 1000 times solution or 48% Le Siben EC 2000x solution to water the soil surface of the nursery can effectively control the damaging effects.
When the seedling bed soil of drug-killing seedlings is disinfected, the dosage is too large, the bed soil is too dry after sowing, and the spraying concentration after emergence is too high, which can easily cause drug-killed seedlings. Preventive measures: Do not use excessive doses of seedbed soil disinfection. After the treatment of the seedbed, it is necessary to maintain a humidity, but the amount of water each time should not be too much to avoid excessive moisture seedbed. Once roots occur, they must be promptly ventilated and drained to promote evaporation. On rainy days, dry fine soil or dry wood ash can be spread on the seedbed.
Fertilizer seedlings bed soil mixed with uncooked organic fertilizer or mixed fertilizer caused uneven burning caused by burning seedlings. Prevention and control measures: The organic fertilizer must be fully decomposed and evenly mixed with the seedbed soil. When sub-seedling, the soil should be compacted and leveled, and the nutrient should be thoroughly drenched.
Freezing of dead seedlings at the time of cold currents and low temperatures did not take timely measures to prevent cold, resulting in seedlings being frozen and dying, or the seedlings were improperly planted. The temperature of the seedbed soil was too low, and the seedlings could not take root and cause dead seedlings after being divided into seedbeds. Prevention and control measures: First, during the seedling raising period, attention should be paid to changes in the weather. In the event of cold currents and low temperatures, the cover should be increased in time. The second is the use of artificial temperature control seedlings, such as electric hotbed nursery, seedlings. The third is to reasonably increase light, promote photosynthesis and accumulation of nutrients, properly control watering, reasonably increase phosphate fertilizer, potash fertilizer, etc., to improve seedbed soil temperature, ensure seedling temperature requirements, and improve cold resistance.
Air-dried dead seedlings that have not been ventilated for a long time are exposed to relatively high humidity. When the bed is ventilated, direct convection of cold air, or sudden release of air from the membrane, and the cover is blown away by strong winds, will cause hot and cold air inside and outside the seedbed. If the transformation is too intense, the sudden drop in air temperature and humidity will cause the delicate leaves to lose too much water, causing wilting. If the wilting lasts for a long time, the leaves cannot be restored and it will eventually become green and dry. This phenomenon is called air drying. Prevention and control measures: When ventilating seedbeds, they should be ventilated on the side of sheltered winds. The amount of ventilation should be from small to large, so that the seedlings have a process of adaptation, windy weather, pay attention to the pressure of the cover, and prevent the wind from blowing.
Improper sprouting caused seedlings to be over-emerged at one time, and it was too late to make the seedlings lose water too much. It was not easy to recover and die after seedling splitting; the seedlings developed poorly before sub-seedling, and the roots were few; the seedlings were too late. Causes damage to the roots and weakens the absorptive capacity. Preventive measures: Do not overshoot the roots when lifting, and bring more soil. Remove the seedlings with a damp cloth to prevent excessive water loss. In the process of raising seedlings, the seedlings with few roots, broken leaves, sensible and deformed seeds should be removed; the seedlings should not be large enough to promote the survival rate. Usually the first time the seedlings were divided, when the seedlings of the eggplant were in two leaves, the seedlings of the cabbage were in one leaf and the seedlings of the cucumber were before the cotyledon was unfolded. Sub-seedlings should be selected for sunny days. If the greenhouse is strong and the temperature is high, a straw or shaded roof can be placed over a small shed in the greenhouse to prevent direct sunlight from reaching the seedlings that have just been divided. It caused water loss and wilting, and severely killed dead trees.
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