As the outside temperature rises, cucumbers and squashes will be listed in greenhouses in the early spring. Tomatoes and cucumbers in greenhouses will gradually enter the fruitful period. In addition to the need to prevent the adverse effects of the “cold winter†on vegetable installations, we must also pay attention to the prevention and control of various pests that are active with increasing temperatures. The root diseases of vegetables are very difficult to control. Irrigation with fungicides is an effective measure, but we must pay attention to methods, otherwise, not only will not receive the desired results, but also have side effects.
Drug selection should be reasonable. It is necessary to select bactericides with strong pertinence and better control effect. Do not blindly use drugs, so as not to delay the timing of prevention and control, and to reduce waste as much as possible.
The application concentration should be appropriate. Fungicides should be mixed with amino acid liquid fertilizers or hormones with stimulating root development as much as possible. The concentration of the liquid medium should not exceed 1500 times, to prevent excessive concentration of soil liquids around the vegetable roots, resulting in phytotoxicity.
Soil biology should take into account. The selected fungicides cannot destroy the biological population and ecological balance within the soil after being applied to the soil. If you have applied the fertilizer in the greenhouse, try not to use the fungicide to root and prevent disease, to prevent the killing of beneficial microorganisms in the bacterial fertilizer, so that the fertilizer loses fertilizer efficiency. If the vegetables have been damaged, they must be sterilized with a fungicide, and do not consider whether the beneficial microorganisms in the fungicide will be damaged, so as not to cause a large loss, leading to disease outbreaks.
Do not water before irrigating. First, because the root diseases of vegetables have already occurred, if watered, the germs will spread with water, causing more dead trees. Second, because watering easily leads to a decrease in the permeability of the soil, the roots of vegetables are deprived of oxygen and roots are produced. The resistance of the plants is reduced, and the pathogens are more easily infiltrated, which exacerbates the occurrence of dead trees. Therefore, water should not be poured before irrigating roots.
Do not water immediately after irrigating. Watering immediately after irrigating will quickly dilute the liquid in the soil and reduce the bactericidal and disease-preventive effects. Therefore, try not to water within a few days after filling with the fungicide. If there is a lack of water, a small amount of water may be poured in the planting ditch, preferably 1â„3 of the surface to the ridge height, and do not diffuse over the ridge to avoid dilution of the soil concentration of the Chinese herbal medicine.
Remedy of phytotoxicity should be timely. After sterilizing with the fungicide, once the crop appears wilting, yellowing, stop growing and other symptoms of phytotoxicity, it should be promptly remedied to avoid causing greater losses. Remedial measures: First, quickly pour a clean water to dilute the concentration of the soil of the Chinese herbal medicine; secondly, use the love-increasing or Yunda 120 spray plus irrigation roots in time to ease the injury and prompt the root system to restore its vitality as soon as possible so that the plants can be transplanted. Normal growth.
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