RHODODENDRON DISEASES

By The Old House Web

RHODODENDRON DISEASES

List of files and visuals associated with this text.


Gray blight infection follows an injury, such as winter injury. A spot, which is at first white with a dark brown margin, forms on the leaf. Protect plants from winter injury. No chemical control is listed.

Dieback is also called Botryosphaeria canker. The leaves are attacked near the tips or at the margins; then spots form on the entire leaf. Leaf stalks and twigs are eventually infected. Prune off infected parts. No chemical control is listed.

Leaves infected with Phytophthora dieback turn brown, roll, then drop off. The stem shrivels and a canker forms, eventually girdling the stem. Prune out diseased branch tips. No chemical control is listed.

Powdery mildews of different genera form a white coating on the leaves. Use sprays of benomyl or sulfur.

Leaf spots may be caused by any number of fungi. Use a spray of basic copper sulfate.

Visuals associated with this text.

Visual title - Visual size Visual title - Visual size
Iron deficiency on rhododendron early - 38K Iron deficiency on rhododendron advanced - 34K
Phytophthora root rot on rhododendron - 33K Phytophthora root rot on rhododendron - 37K
Phytophthora root rot on rhododendron, branch dieback - 43K Phytophthora root rot on rhododendron, inner bark symptoms - 17K
Powdery mildew on azalea - 44K
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