What should I do if there are black spots on the leaves of green radish
Green radish is a common leaf-viewing plant in the home, and black spots on its leaves often leave growers at a loss. These abnormal spots may be caused by multiple factors such as temperature, fertilizer damage, and disease. If not treated in time, it will affect the overall health of the plant. This article will systematically analyze the causes of black spots and provide targeted solutions. Causes of green radish black spots are diagnosed as being too low, causing frostbite. In winter, when the environmental temperature is below 10℃, green radish cell fluid will freeze and cause freezing damage. In the early stage, water-stained patches appear on the leaf margins. As frostbite worsens, black necrotic spots will form, accompanied by drooping leaves and softening stems. The plant needs to be moved immediately to an environment of 20-25 ° C and used disinfectant scissors to cut off more than 50% of the leaves damaged. Fertilizer burns leaf tissue When concentrated fertilizer solution directly contacts leaves, high concentrations of nutrients will destroy epidermal cells within 6-8 hours. It is characterized by sudden round black spots with charred yellow edges. It is recommended to use a cotton swab dipped in clear water to wipe the leaves repeatedly, and cut off damaged leaves in severe cases. Subsequent fertilization should follow the principle of "applying thin fertilizer frequently" and use liquid fertilizer diluted 2000 times. Fungal disease spread of infection (T-J) disease and leaf spot disease are the main pathogens. They initially appear needle-like black spots and expand into irregular patches within 3-5 days. It is necessary to isolate the sick plants and cut off the infected sites, and alternately spray difenoconazole and mancozeb solutions once a week for 3 consecutive weeks. Maintaining ventilation and reducing humidity to below 60% can effectively inhibit the reproduction of bacteria. Daily maintenance and prevention points: Maintain a constant temperature environment of 18-28 ° C, and use a heating pad in winter; use dipping basin method to water to avoid leaf residue; wipe the leaves with garlic extract every month to enhance disease resistance. Regularly rotate the flowerpot to ensure even light, and the growth rate of new leaves is stable at 1-2 leaves per week for a healthy state.
By accurately judging the type of black spot and taking corresponding measures, and cooperating with scientific maintenance methods, green radish can return to its green state in 1-2 months. It is recommended to establish a maintenance log to record key data such as temperature, fertilization, and diseases to form a personalized maintenance plan.