What to Do When Camellia Gets Anthracnose? Illustrated Guide to Prevention and Control Methods
Symptoms and pathological changes of camellia anthracnose: Camellia anthracnose mainly affects the leaves. Diseased leaves have round or irregular brown to grayish-brown spots, with darker edges or yellow halos; some spots are grayish-white, and the leaf spots are sunken or have dark edges.
On the spots, concentric-ringed or scattered small black dots appear. When humid, pink gelatinous substances emerge on the dots, and diseased leaves drop easily; in severe cases, only a few leaves remain on the whole plant. Light brown spots appear on the twigs, which then gradually dry up and turn grayish-white, with small black dots forming; in severe cases, the spots extend downward, causing the twigs to die.
Prevention and control methods:
1. Strengthen fertilizer and water management, ensure trench drainage in the nursery, prevent the soil from being too wet, and enhance the plant's disease resistance.
2. In winter, combine with pruning to remove diseased branches and leaves, clear fallen leaves, and destroy them in a centralized manner.
3. Chemical control: Spray with 25% Tanterling wettable powder at 500 times dilution, or 50% Topsin wettable powder at 800~1000 times dilution, or 50% Tuzet wettable powder at 1000 times dilution. When spraying, mix in a 0.3%~0.4% potassium dihydrogen phosphate solution to enhance plant resistance.
Prevention and Control Methods for Camellia Anthracnose (Illustrated)
Symptoms and pathological changes of camellia anthracnose: Camellia anthracnose mainly affects the leaves. Diseased leaves have round or irregular brown to grayish-brown spots, with darker edges or yellow halos; some spots are grayish-white, and the leaf spots are sunken or have dark edges.On the spots, concentric-ringed or scattered small black dots appear. When humid, pink gelatinous substances emerge on the dots, and diseased leaves drop easily; in severe cases, only a few leaves remain on the whole plant. Light brown spots appear on the twigs, which then gradually dry up and turn grayish-white, with small black dots forming; in severe cases, the spots extend downward, causing the twigs to die.
Prevention and control methods:
1. Strengthen fertilizer and water management, ensure trench drainage in the nursery, prevent the soil from being too wet, and enhance the plant's disease resistance.
2. In winter, combine with pruning to remove diseased branches and leaves, clear fallen leaves, and destroy them in a centralized manner.
3. Chemical control: Spray with 25% Tanterling wettable powder at 500 times dilution, or 50% Topsin wettable powder at 800~1000 times dilution, or 50% Tuzet wettable powder at 1000 times dilution. When spraying, mix in a 0.3%~0.4% potassium dihydrogen phosphate solution to enhance plant resistance.
Prevention and Control Methods for Camellia Anthracnose
SymptomsIt mainly affects leaves and young shoots. The pathogen mostly invades from leaf tips and leaf margins, forming round or irregular spots, dark brown, with raised edges; the spots vary in size, and later small black dots grow on the spots, in concentric rings or scattered. When humidity is high, pink sticky masses ooze out. Diseased leaves dry up and drop easily. The spots on new shoots are elongated, slightly sunken, light brown, with distinct edges; in severe cases, the twigs die.
Disease occurrence patternsThe pathogen overwinters as mycelium or acervuli on diseased plants and plant debris, spreads through wind and rain, and mostly invades through wounds and weakened parts. Weak plant growth, poor drainage, high temperature and high humidity favor the occurrence of the disease.
Prevention and control methods
1. Remove dead branches and fallen leaves, prune diseased branches and destroy them.
2. Apply more organic fertilizer, phosphorus and potassium fertilizer, and ferrous sulfate to enhance disease resistance.
3. Chemical control: After new shoots emerge, spray protective fungicides for protection, using “50% carbendazim at 800 times dilution, 70% thiophanate-methyl at 1000 times dilution, 75% chlorothalonil at 800 times dilution, or 80% anthracnose-formaldehyde at 800 times dilution, once every 10~15 days, spraying 4—5 times consecutively.