Cylindrocladium
rot
Calonectria
illicicola (fungus)
Annemiek Schilder,
MSU Plant Pathology
Bill
Cline, NCSU Plant
Pathology |
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This fungal disease of cuttings in
propagation beds occurs mostly in the southeastern United
States. It is also common in ornamental plant nurseries.
Symptoms
Circular patches of dead cuttings appear
in propagation beds as the disease rapidly spreads from
an initial infected cutting.
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Disease
cycle
Infections are thought to originate from nearby infected trees
(oak, sweet gum, tulip poplar). Initial infection of young
shoots may occur in the field or after cuttings are stuck.
Spores are splash-dispersed to infect surrounding cuttings.
The fungus overwinters in infested rooting media. |
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 |
Orange fungal fruiting bodies (perithecia) on the surface of a dead stem. |
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Management
Start with clean rooting media and do not reuse old
media; avoid placing propagation beds under trees that may be a
source of disease; remove diseased cuttings and treat with fungicides. |
