Branch tips usually die. When infected, leaves appear speckled with a silver or bronze cast. To confirm the presence of botrytis turn the affected flower over and look … Mites are typically most active during spring and fall when the weather is cool. Gray blotches appear on the bark and stem, and then sunken areas (cankers) develop, eventually girdling the stem. Leaves on affected branches suddenly turn yellow and wilt. Spider Mites are a common, but serious pest of many ornamental plants, including camellia. Some control may be had by spraying the plant with water, but usually chemical controls will be more effective. Botrytis (Grey Mould) This is one of the most common airborne fungal diseases affecting camellias. Parts of the plant above the stem canker lose vigor, wilt, and die. Normally only a few leaves show symptoms, which can range from a few spots to almost the whole leaf being yellow. Damaged plants show more symptoms … It causes premature aging of blooms and brown spots especially in the centre of flowers. Camellia Dieback & Canker: This is one of the most serious of all camellia diseases and is caused by the fungus Glomerella cingulata. Yellow leaves can indicate that a plant is suffering from a nutrient deficiency or is affected by cold weather, but yellow blotches on camellia leaves are often caused by a virus.

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