Hans M. Heybroek is a Dutch botanist best known for his researches into the genus Ulmus at the Dorschkamp 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

Phytopathology

Plant pathology is the scientific study of plant diseases caused by pathogens and environmental conditions . Organisms that cause infectious disease include fungi, oomycetes, bacteria, viruses, viroids, virus-like organisms, phytoplasmas, protozoa, nematodes and parasitic plants...

, Heybroek also investigated the Coral Spot fungus Nectria cinnabarina

Nectria cinnabarina

Nectria cinnabarina is a plant pathogen that causes cankers on many tree species and also a disease known as coral spot.- External links :* *...

in elm. In 1960 he travelled to the Kashmir

Kashmir

Kashmir is the northwestern region of the Indian subcontinent. Until the mid-19th century, the term Kashmir geographically denoted only the valley between the Great Himalayas and the Pir Panjal mountain range...

 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. (1966). Breeding pest-resistant trees. Pages 387-389. Pergammon Press, Oxford.
• Iep of olm, karakterboom van de Lage Landen (:Elm, a tree with character of the Low Countries), (with Goudzwaard, L, Kaljee, H.) (2009). KNNV, Uitgeverij. ISBN 9709050112819.
• The Dutch elm breeding program. Dutch Elm Disease Research, Chapter 3, in Sticklen & Sherald, Eds. (1993). Springer Verlag, New York, USA.
• Elms of the Himalaya (co-author R. Melville
  Ronald Melville
  Ronald Melville was an English botanist, based at the Royal Botanic Gardens Kew. He is chiefly remembered for his wartime research into rosehips as a source of vitamin C, prompted by the epidemic of scurvy amongst children owing to the reduced importation of fresh fruit...
  
  ). Kew Bulletin Vol. 26(1), 1971, London.
• Resistant Elms for Europe. In Burdekin, D. A. (Ed.) Research on Dutch elm disease in Europe. For. Comm. Bull. 60. pp 108 - 113. 1983.

External links