Camellia
On Camellia, brown lesions tend to form at the leaf tip and are irregular in shape when the plant is infected with P. ramorum. As with Rhododendron, they are associated with the midrib and petiole. Occasionally lesions form at the edge of the leaf. The lesions appear diffuse and water-soaked, and no fruiting bodies are visible. Defoliation often occurs on lower leaves of infected Camellia plants. No canker or dieback symptoms have been observed on Camellia.
Camellia foliage can be affected by sunscald. Lesions from sunscald have defined margins, are not water-soaked, and are not associated with the midrib. These lesions can become infected with opportunistic fungi such as Pestalotia and Pestalotiaopsis.
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Sunscald injury on Camellia leaves (Photo: Norm Dart, Washington State University) |
Camellia leaves infected with P. ramorum (Photo: Oregon Department of Agriculture) |
Defoliation of lower leaves caused by P. ramorum (Photo: Cheryl Blomquist, CDFA)
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