Dutch elm disease

(redirected from Ophiostoma novo-ulmi)
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Related to Ophiostoma novo-ulmi: elm bark beetle, Ophiostoma ulmi

Dutch elm disease

a disease of elm trees, caused by a fungus, Ceratostomella ulni, which blocks the XYLEM VESSELS, resulting in a lack of water to the aerial parts, leading to yellowing of the foliage, defoliation and eventual death. The fungus is carried by elm bark beetles such as Scolytus scolytus, which bore beneath the bark to lay eggs. The disease was probably introduced to Britain on timber imported from Canada, and reached epidemic proportions in the UK in the 1970s.