Pacific Northwest Plant Disease Management Handbook
Printed page URL:
https://pnwhandbooks.org/node/415
Plant Disease
Host and Disease Descriptions
Host and Disease Descriptions
Reviewed: March 2023
Onion (
Allium cepa
)-Rust
Onion (
Allium cepa
)-Smut
Onion (
Allium cepa
)-Twister
Onion (
Allium cepa
)-White Rot
Orchid-Bacterial Brown Spot
Orchid-Botrytis Blight
Orchid-Virus Diseases
Oregon Grape (
Berberis aquifolium
)-Leaf Scorch
Oregon Grape (
Berberis aquifolium
)-Leaf Spot
Oregon Grape (
Berberis aquifolium
)-Powdery Mildew
Oregon Grape (
Berberis aquifolium
)-Rust
Otto Luyken-dwarf form of (
Prunus laurocerasus
)
Oxalis-Leaf Spots
Oxalis-Rust
Nandina
Narcissus
Nasturtium-Botrytis Blight
Nectarine
Ninebark (
Physocarpus
spp.)-Powdery Mildew
Madrone (
Arbutus menziesii
)-Canker
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