Halo blight

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Halo blight
Bean Halo Blight.jpg
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]

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.


Remove and destroy affected plants.


Rotate crops each season. Never soak seeds before sowing.