Vegetable Seedling Common Diseases and Prevention

<p> At the moment, it is during the nursery period of the deep winter wolfberry vegetables in the protected area. If improper management during the nursery process, the occurrence and spread of the disease can easily be caused. After the seedlings were damaged, the light seedlings were damaged to varying degrees and the young seedlings were reduced, which could not meet production requirements. Heavy damage to the entire seedbed will result in a major loss of vegetable production. Therefore, grasping the prevention and cure of vegetable disease at seedling stage is the key to obtaining the harvest of high yield of vegetables. The following describes the symptoms of common diseases such as damping-off, blight, and anthrax, and their prevention and control methods.

First, the symptoms of disease

1. To fall ill. The disease can develop before and after emergence. When the seedlings become ill before emergence, it can cause radicles and cotyledons to rot and the seedlings cannot be properly excavated. If the disease develops after the seedlings emerge, a water-soaked lesion will appear at the base of the seedlings, and the lesions will turn yellow-brown, shrink and shrink, and the seedlings will fall to the ground.

2. Blight. The disease occurs in the middle and late stages of seedling growth. At the time of onset, the stem base of the seedlings produces an oval-shaped dark brown spot. The early stage of the disease often wilts during the day and can return to normal at night. As the disease progresses, the lesion surrounds the stem for a week and sinks downward and shrinks. The entire seedling died.

3. Anthrax disease. At the onset of seedlings, semi-circular brown lesions appeared on the edge of the cotyledon, and the diseased tissue eventually died and ruptured. In severe cases, the diseased part rotted and expanded, causing fallen leaves. The base of the diseased seedling stem was close to the ground, and initially there was a red longitudinal crack, which later expanded into a brown, long, wrinkled lesion, slightly concave. In the event of rain and rain, the roots and roots of the diseased seedlings turn black and rot and die.

Second, control methods

1. Seedbed selection. It is better not to use bed soil seedlings from old seedbeds. Instead, choose new seedbeds or loam soils that have not grown vegetable crops. Otherwise, there will be more pathogenic bacteria in the soil, which can easily induce various diseases. The selected seedbed should be high-dry, with loose soil, ventilation, water permeability, and strong water retention and fertilizer retention.

2. Bed soil disinfection. Use 50% carbendazim wettable powder, 10 g/m2, mix the drug with a small amount of finely-ground fine soil, spread 1⁄3 of the uniform soil on the seedbed, and leave the remaining medicine after sowing. Soil covered on top. In this way, the entire nursery bed has medicinal soil on the top and bottom, and the sterilization effect can reach more than 90%.

3. Seedbed management. Build high-quality seedbeds so that seedbeds can both keep warm and cool and prevent cold wind from invading. When encountering rainy weather, it is necessary to dig trench drainage in time to prevent water accumulation in the seedbed. Even after sunny days, the seedbed ventilation should be strengthened.

4. Chemical control. When a few strains are found on the bed, they should be removed promptly. Can spray 75% of chlorothalonil wettable powder 800 times on the seedbed, spray once every 7-10 days, continuous medication 2 or 3 times. Can also be spread on the seedbed of plant ash, not only can reduce the moisture within the seedbed, but also can increase heat absorption, increase the amount of potassium in the soil, is conducive to robust seedling growth, improve disease resistance.

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