What to Do When Circular Spots Appear on the Leaves of Spring Orchid
Analysis of the Causes of Spring Orchid Leaf Spot Disease
As a traditional famous Chinese flower, Spring Orchid is highly favored for its elegant blooms. However, several flower enthusiasts have recently reported circular spots on the leaves, which, according to plant protection experts, are typical symptoms of the orchid (T-J) disease. This disease is highly contagious, initially presenting as red-brown semi-circular spots, which gradually expand into circular sunken patches as the disease progresses. The edges show a distinct yellow halo, severely affecting the plant's photosynthesis and ornamental value.
Four-Step Prevention and Treatment Method for Spring Orchid (T-J) Disease
Isolation and Disinfection Treatment
Infected plants need to be immediately moved out of the cultivation area and the diseased leaves cut off with scissors disinfected with alcohol. For severely infected plants, it is recommended to destroy the entire plant to prevent mycelium from overwintering in the soil and spreading.
Environmental Control Key Points
Keep a ventilation gap of more than 30cm between plants, maintaining a humidity environment of 50%-70%. Build a rain shelter during the rainy season and ensure the night temperature is above 10℃ in winter. It is recommended to use hanging pots for cultivation to enhance air circulation.
Chemical Control Program
In the early stages of the disease, alternately use a 50% carbendazim 500x solution and a 75% chlorothalonil 800x solution, focusing on spraying the back of the leaves. During high-temperature seasons, combine with 0.2% potassium dihydrogen phosphate to enhance disease resistance, spraying once every 10 days for 3 weeks to see results.
Daily Maintenance Norms
Choose a mixture of pine bark and volcanic rock as the growing medium, supplementing EM bacteria monthly to improve the soil. Avoid prolonged leaf water accumulation and promptly wash off any fertilizer residue after feeding. Conduct preventive spraying in spring and autumn.
Long-Term Strategy for Preventing and Treating Spring Orchid Leaf Spot Disease
Establish a regular inspection system, with new plants isolated for observation for 2 weeks. It is recommended to use a thermometer and hygrometer to monitor environmental data in real-time, and turn on the circulating fan during the plum rain season. Combine biological control by adding Bacillus subtilis to the growing medium to inhibit the multiplication of pathogenic bacteria. With scientific care, the incidence of Spring Orchid (T-J) disease can be reduced by more than 80%.