Cinnamon Camellia Brown Spot Disease Control Methods
An article on green plant knowledge, introducing the related experience of the Flower Clinic with cinnamon camellias, cinnamon camellia brown spot disease control methods, and a detailed introduction follows.
Cinnamon camellia brown spot disease is a very common disease, which can cause severe defoliation of the entire plant, affecting flowering and ornamental value. The pathogen primarily infects the leaves, causing small yellow spots to appear initially, which then gradually turn yellowish-brown to gray-brown. Lesions are usually round or irregular in shape, or may be restricted by leaf veins and appear as angular spots. Lesion diameter ranges from 2 to 10 millimeters, with a yellow halo around the outside.
Lesions produce black mold spots in damp weather, which are the conidiophores and conidia of the pathogen. The cinnamon camellia brown spot pathogen overwinters as mycelium in diseased plants and fallen leaves, becoming the primary source of infection in the following year. Conidia begin to form in late March each year, starting the initial infection. They are spread by air currents and raindrops and can infect directly or through wounds or natural openings, with older leaves being more susceptible than young leaves. Brown spot disease occurs from April to October, and symptoms subside after November. High temperature and humidity favor disease development. There are differences in resistance among varieties, with general cinnamon camellias having stronger resistance than golden or silver camellias.
Control methods:
1. Combine pruning with the removal of diseased leaves, clearing fallen leaves from the ground, and incinerating or deeply burying them to reduce the initial source of infection. Continuous application for two years will yield effective results.
2. Strengthen cultivation management, avoid soil waterlogging, ensure ventilation and light. Apply humus fertilizer and potassium fertilizer to enhance the plant's resistance to disease.
3. During the outbreak period, you can spray a 1:2:100 lime Bordeaux mixture, or a 50% benlate wettable powder at a concentration of 1000~2000 times, or a 20% pyrazophos at 500-800 times, or a 50% thiram at 1000 times.
The above is a comprehensive explanation of the cinnamon camellia brown spot disease control methods (figure), hoping it can help you.