Halo blight

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Halo blight
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A bean leaf showing signs of halo blight
Scientific Classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Pseudomonadales
Family: Pseudomonadaceae
Genus: Pseudomonas
Species: Pseudomonas amygdali
Pathovar: Pseudomonas amygdali pv. phaseolicola

Halo blight (Pseudomonas amygdali pv. phaseolicola) is a bacterial blight disease in legumes. It causes small brown spots on the leaves with a light coloured edge.

Identifying Features[edit | edit source]

Small brown spots surrounded by a yello 'halo' appear on the leaves. Pods appear wet when they develop. Plant growth is stunted and suffer reduced crop yield. Attacks are worst during prolonged wet periods.

Treatment[edit | edit source]

Remove and destroy affected plants.

Prevention[edit | edit source]

Rotate crops each season. Never soak seeds before sowing.

Examples[edit | edit source]