In winter, the temperature is low, the ventilation in the vegetable greenhouses is poor, the light is insufficient, the resistance of the seedlings is weak, and improper management in the nursery process can easily lead to damping-off, blight, and underground pests. After the seedlings were damaged, the seedlings were damaged to varying degrees, and the young seedlings were reduced, which could not meet the production requirements. In severe cases, a large number of seedlings were killed, and the agricultural production time was delayed, causing significant losses to the vegetable production. Therefore, grasping the diseases of vegetable seedlings and the prevention and control of underground pests is the basis for the harvest of high yields of vegetables.
Major pests and diseases
The early stage of the growth of the main disease seedlings is prone to damping-off disease. If cold, rainy or cold weather is encountered, the cold wind invades the seedbed, which is beneficial to the occurrence of the disease. Seedlings are prone to blight after prosthesis planting, seedlings high humidity is conducive to the breeding of blight pathogens, seedlings susceptible to disease when prolonged, in particular seeding seedbeds dense, seedlings are not timely, etc., is conducive to the spread of the disease. Recently, there have been cold attacks in our province, and the temperature is relatively low. If there is a continuous low-temperature haze weather, it may cause the seeds to germinate for a long time and the germination is weak. Therefore, it is expected that the incidence of blight will be more serious. If the management measures are not in place, under the appropriate environmental conditions, the disease develops rapidly, and the phenomenon of roots is also prone to occur.
Underground pests harm the soil in winter seedbeds. There are many ground pests, such as ground tigers, earthworms, and cockroaches. They mostly occur after emergence to the time of seedling emergence. Winter seedbeds have suitable habitats, and they are highly concealed and difficult to control. Insects often cause damage. Injury to roots and dead seedlings, resulting in a large number of seedlings, should be strengthened around the investigation of pests, timely control.
Prevention
Seedling disease winter vegetable seedlings, we should strengthen the insulation, temperature and temperature, humidity management, strengthen the prevention and control of technical measures to take the main agricultural control, supplemented by chemical control. Choose a warm sunny day to unmask the seedlings, ventilate and change the air, and strictly control the temperature and humidity of the seedbed. The diseased seedlings should be promptly removed, and the overgrowth seedlings can be controlled and controlled through temperature-controlling, hardening, transplanting, and planting, to increase their resistance to stress, and to grow thin seedlings or frostbite. The seedlings with poor root growth may be sprayed with alizarin and other growth regulators to promote the recovery of the plants as soon as possible; for the greenhouses with high humidity, dryness shall be used to reduce the humidity in the greenhouse.
If there are sporadic diseases after emergence, spraying should be promptly controlled. To prevent the occurrence of seedling disease, broad-spectrum fungicide can be used, and at the noon of sunny days, the pesticide is sprayed regularly before the onset of disease. Before transplanting, seedlings must be transplanted with drugs. For transplanted greenhouses, individual seedlings with weaker growth and disease incidence must be caught in the initial stage of the disease so as to avoid delaying the timing of prevention and treatment. Bacterial damping-off and damping-off can be controlled with 50% carbendazim WP and 30% carbendazim. For control of damping-off and damping-off, 50% carbendazim WP and 30% carbendazim thiram can be used to spray on the bed, prevent and treat once every 7-10 days, and continuously control 2～ 3 times.
The control strategy of underground pests should be based on agricultural measures to make the living environment of pests worse, supplemented by chemical control and other measures. To prevent underground pests, safe and effective control agents should be selected according to the relevant national regulations. For example, 0.4% chlorantraniliprozin granules, 0.2% bifenthrin granules, and other new high-efficiency and low-toxicity agents should be used in place of chlorpyrifos and have high toxicity. Pesticides that are subject to excessive levels of residue are used for prevention and control. The pesticides applied during colonization should not be directly contacted with the roots of crops to prevent phytotoxicity.
Major pests and diseases
The early stage of the growth of the main disease seedlings is prone to damping-off disease. If cold, rainy or cold weather is encountered, the cold wind invades the seedbed, which is beneficial to the occurrence of the disease. Seedlings are prone to blight after prosthesis planting, seedlings high humidity is conducive to the breeding of blight pathogens, seedlings susceptible to disease when prolonged, in particular seeding seedbeds dense, seedlings are not timely, etc., is conducive to the spread of the disease. Recently, there have been cold attacks in our province, and the temperature is relatively low. If there is a continuous low-temperature haze weather, it may cause the seeds to germinate for a long time and the germination is weak. Therefore, it is expected that the incidence of blight will be more serious. If the management measures are not in place, under the appropriate environmental conditions, the disease develops rapidly, and the phenomenon of roots is also prone to occur.
Underground pests harm the soil in winter seedbeds. There are many ground pests, such as ground tigers, earthworms, and cockroaches. They mostly occur after emergence to the time of seedling emergence. Winter seedbeds have suitable habitats, and they are highly concealed and difficult to control. Insects often cause damage. Injury to roots and dead seedlings, resulting in a large number of seedlings, should be strengthened around the investigation of pests, timely control.
Prevention
Seedling disease winter vegetable seedlings, we should strengthen the insulation, temperature and temperature, humidity management, strengthen the prevention and control of technical measures to take the main agricultural control, supplemented by chemical control. Choose a warm sunny day to unmask the seedlings, ventilate and change the air, and strictly control the temperature and humidity of the seedbed. The diseased seedlings should be promptly removed, and the overgrowth seedlings can be controlled and controlled through temperature-controlling, hardening, transplanting, and planting, to increase their resistance to stress, and to grow thin seedlings or frostbite. The seedlings with poor root growth may be sprayed with alizarin and other growth regulators to promote the recovery of the plants as soon as possible; for the greenhouses with high humidity, dryness shall be used to reduce the humidity in the greenhouse.
If there are sporadic diseases after emergence, spraying should be promptly controlled. To prevent the occurrence of seedling disease, broad-spectrum fungicide can be used, and at the noon of sunny days, the pesticide is sprayed regularly before the onset of disease. Before transplanting, seedlings must be transplanted with drugs. For transplanted greenhouses, individual seedlings with weaker growth and disease incidence must be caught in the initial stage of the disease so as to avoid delaying the timing of prevention and treatment. Bacterial damping-off and damping-off can be controlled with 50% carbendazim WP and 30% carbendazim. For control of damping-off and damping-off, 50% carbendazim WP and 30% carbendazim thiram can be used to spray on the bed, prevent and treat once every 7-10 days, and continuously control 2～ 3 times.
The control strategy of underground pests should be based on agricultural measures to make the living environment of pests worse, supplemented by chemical control and other measures. To prevent underground pests, safe and effective control agents should be selected according to the relevant national regulations. For example, 0.4% chlorantraniliprozin granules, 0.2% bifenthrin granules, and other new high-efficiency and low-toxicity agents should be used in place of chlorpyrifos and have high toxicity. Pesticides that are subject to excessive levels of residue are used for prevention and control. The pesticides applied during colonization should not be directly contacted with the roots of crops to prevent phytotoxicity.
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