Dr Barbara, senior research scientist at Warwick Crop Centre in the university's School of Life Sciences, died last Sunday after a short period in hospital, said school deputy head Professor Brian Thomas.
"Dez will be greatly missed both within the school and the wider science and horticulture community," he commented. "Our thoughts go out to his wife, Anne, and his family."
Professor Geoff Dixon said: "I'm very, very sad and this is a big loss. Dez was an expert in plant stress, disease pathology and aspects of physiology, and became a master of many areas as the spectrum of staff at Warwick contracted."
He added: "He was very good in the field and the laboratory and was well known among growers as well as the research community."
ADAS senior entomologist Dr Buxton died suddenly at his home. He was 63. He studied at the University of Bradford and before gaining a PhD at Wye College.
Buxton joined ADAS in 1984, specialising in pests of ornamentals, and over the years worked with colleagues from other organisations including Rothamsted, the Food & Environment Research Agency, Stockbridge Technology Centre and John Innes on a range of projects.