Peppery Leaf Spot of Brassicas

Pseudomonas syringae pv. maculicola

Description:

Black to purplish small peppery spots with a fine yellow rim on the leaves.

Species Affected:

Brassicas.

Biology:

Favoured by cool, wet conditions.
Often develops rapidly after plant stress or injury.
Survives on crop residues
Spread on seed, by free water on leaves, by mechanical means or insects.

Life Cycle:

Origin and History:

Distribution:

Significance:

Management and Control:

Plant clean seed.
Hot water/air-steam treatment control seed infection by may reduce germination.
Destroy crop residues soon after harvest.
Don't plant Brassica crops in areas that were infected in the previous season.
Apply fungicides.

Related and Similar Species:

References:

1292

Acknowledgments:

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