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.
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