Cause Leaves facing the south and southwest are most likely to show sunburn. New leaves exposed to high radiation following periods of cool, cloudy weather are at high risk for injury. Newly transplanted bushes may also be of increased risk of developing sunburn. Cold clear winter weather can also be conducive to sunscald.
Symptoms Necrotic lesions on sun-exposed Camellia leaves. Brown necrotic areas may have grayish centers and/or with yellowish borders.
Cultural control
- Prune bushes shortly after flowering and not during the summer.
- Occasionally supply supplemental irrigation during the annual PNW summer drought.
Reference Gould, C. J., Harris, M. R., and Eade, G. W. circa 1950s. Diseases of ornamentals. State College of Washington, Extension Service, Ext. Mimo. #683.