Camellia Petal Blight Affecting California Blooms

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Camellia petal blight, caused by the Ciborinia camelliae fungus, is affecting camellia plants in California, especially during wet weather when the flowers are blooming. The disease causes small brown spots on petals that rapidly enlarge, leading to entire flowers turning brown and dropping prematurely.

Why it matters

Camellia petal blight can severely damage the appearance and health of camellia plants, which are popular ornamental shrubs in California landscapes. The disease is difficult to control once it takes hold, so prevention through proper planting, watering, and sanitation is key.

The details

The fungus infects camellia flowers when they are wet, discharging spores that land on the blooms and cause the characteristic brown spots. All cultivars of Camellia japonica are susceptible, while Camellia sasanqua is infected less often. Blighted petals become dry and leathery but do not crumble, and the flowers often drop intact to the ground.

• Camellia petal blight occurs during the winter and spring bloom season.
• The disease is expected to be more prevalent this year due to wet weather.

What’s next

Gardeners should be vigilant in monitoring their camellia plants and promptly removing and disposing of any infected flowers to help prevent the spread of the disease.