Reasons and Prevention of Vegetable Seedlings

Before the planting of the diseased seedlings, the seedbeds, the nutritious soils were not sterilized, the seedlings were not sprayed and sterilized immediately after unearthing, and the temperature and humidity of the seedbeds were mismanaged so that the seedlings were susceptible to damping-off, blight, and death. Control measures: Disinfect bed and nutrient soil. 50% carbendazim WP for 8 to 10 grams per square meter of seedbed, mixed with appropriate semi-dried fine soil and sprinkled on the surface. When preparing nutritious soil, add 50% carbendazim WP 80 to 100 g per cubic meter of nutrient soil and mix thoroughly to prepare nutrient mash. When 80% of the seedlings are unearthed, 80% of Dasheng M-45 WP can be sprayed with 500 times to sterilize and prevent disease, and then spray once every 7-10 days. In addition, timely removal of grasshoppers and ventilation should also be taken to prevent diseases caused by excessive temperature and humidity in the seedbed.

Severe occurrence of underground pests such as earthworms and cockroaches in the death of insect pests will cause a large number of deaths of seedlings. Prevention and control measures: Use 80% dichlorvos EC 1000 times to water the seedbed to prevent lice. Use 80% dichlorvos emulsifiable concentrate 100 times or 50% phoxim 50 times liquid crushed, sauteed bean cakes, wheat bran and other baits made of bait, sprinkled on the seedbed, can kill crickets.

When the drug-killing seedling bed soil is disinfected, the dosage of the bed soil is too large or the bed soil is too dry after sowing, and the spraying concentration is too high after the seedlings are unearthed, which are likely to cause phytotoxicity and die seedlings. Control measures: When the seedbed is disinfected, the dosage should not be too large. The dosage per square meter of bed is 8 to 10 grams. After treatment, the seedbed should keep the soil moist and prevent it from drying out. When the seedlings are unearthed and the pests and diseases are controlled, the concentration of the liquid medicine should be suitable to prevent burning of seedlings.

When the temperature of seedling bed is low, humidity is high, and light is insufficient, the respiration of seedlings will be hindered and die. In addition, if the rainy weather persists for a long time, the seedbed cannot be ventilated and the seedling growth is weak, and then it is more likely that the seedlings will die. Control measures: To control the humidity of the seedbed. Watering seedbeds depends on soil moisture and weather conditions. Each watering volume should not be too large to avoid excessive moisture in seedbeds. In the event of a root collapse phenomenon, timely ventilation and dehumidification, or spread fine dry soil or moisture on the seedbed.

When air-dried dead seedlings ventilate seedbeds, if the film is suddenly opened or the cover is blown by strong winds, the air inside and outside the seedbed will change too much and the air temperature and humidity of the seedbed will suddenly drop, causing the seedlings to lose water, wilt, and die. Control measures: Ventilate the seedbed when it is ventilated, and ventilate it from the small to the large, so that the seedlings have an adaptation process. Windy weather should also pay attention to the compaction of the cover to prevent it from being blown away by strong winds.

Bed Stick

Bed Stick Safety,Bed Sticks Mobility,Bed Stick Occupational Therapy,Bed Stick With Safety Return

Active Life Healthcare Co.,Ltd , https://www.alh-med.com