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How to Manage Pests

Pests in Gardens and Landscapes

Scab—Pseudomonas gladioli

Scab is a disease of gladiolus caused by bacteria that penetrates the corm and then moves up the stem base. Scab causes corms to develop brown to black, irregular or round, sunken spots with shiny brittle, varnishlike bacterial exudates on the surface. Leaf bases have red or brown specks.

Solutions
Scab is favored by poorly drained, wet, warm soils. Provide good soil drainage. Don’t overirrigate or overfertilize. Control chewing insects in soil that injure corms. Remove and destroy infected plants.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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