Johanna Westerdijk
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Johanna Westerdijk was a Dutch plant pathologist and the first female professor in the Netherlands.
Johanna Westerdijk Portrait detail University Museum Utrecht 0285 1853
Westerdijk (c.1948)
Prof.dr. Johanna Westerdijk
Group portrait with Johanna Westerdijk in the center after her oration as a new professor in 1917
Ophiostoma ulmi
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Ophiostoma ulmi is a species of fungus in the family Ophiostomataceae. It is one of the causative agents of Dutch elm disease. It was first described under the name Graphium ulmi, and later transferre
Johanna Westerdijk
…that a fungus was killing the elms. Later J. Westerdijk assigned another student, Christine Johanna Buisman to confirm the finding from Schwarz that Ophiostoma ulmi was the cause of the disease. Buisman additionally bred elms for disease resistance, but unfortunately the elm that she developed was highly susceptible…
Ophiostoma ulmi UL
Asexual synnema can overwinter in bark and wood, and can be spread by beetle vectors.