Hans M. Heybroek Hans M. Heybroek is a Dutch botanist best known for his research into the genus Ulmus Research Institute for Forestry & Landscape Planning . Until his retirement in 1992 , he was responsible for the raising and release of numerous elm hybrid cultivars , notably 'Columella' . Specializing in phytopathology , Heybroek also investigated the Coral Spot fungus Nectria cinnabarina in elm. In 1960 he travelled to the Kashmir to search for a frost-hardy form of the Himalayan Elm Ulmus wallichiana as a source of anti-fungal genes, for use in the Dutch elm research programme .Publications Aims and criteria in elm breeding in the Netherlands . In H. Gerhold et al ., eds.. Breeding pest-resistant trees . Pages 387–389. Pergammon Press, Oxford. Iep of olm, karakterboom van de Lage Landen , . KNNV, Uitgeverij.. The Dutch elm breeding program . Dutch Elm Disease ResearchChapter 3 , in Sticklen & Sherald, Eds.. Springer Verlag , New York, USA . Elms of the Himalaya. Kew Bulletin Vol. 26, 1971, London. Resistant Elms for Europe. In Burdekin, D. A. Research on Dutch elm disease in Europe. For. Comm. Bull. 60. pp 108 – 113 . 1983.
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