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Título: Description and study of a Phoma sp., a new fungal pathogen of lupines (Lupinus albus L.), in Québec
Autores: Phaneuf, Edith.
Fecha: 1998
Publicador: McGill University - MCGILL
Fuente:
Tipo: Electronic Thesis or Dissertation
Tema: Phoma -- Québec (Province).
Lupines -- Diseases and pests -- Québec (Province).
Phytopathogenic fungi -- Québec (Province).
Descripción: Lupines (Lupinus albus L.) can provide high levels of good quality protein for human and animal nutrition. Unlike soybeans, lupine seeds do not need to be processed before consumption. Being a member of the legume family, lupines improve soil structure and fertility. Lupines also have the advantage of being able to grow in cooler climates and in fields of lower fertility than soybean. Lupine production is relatively new in Eastern Canada and new diseases limit production in this region. In 1990, a Phoma sp. was isolated from diseased lupine in Quebec and Nova Scotia. This research was undertaken to acquire further knowledge about this lupine pathogen. The morphological characteristics of this fungus do not exactly fit the description of any other Phoma sp., but it is very close to P. pinodella. This Phoma sp. on lupines may be a new variety of P. pinodella affecting lupine in particular. In vitro, mycelium grew over a wide range of temperatures (5°--35°C), the optimal temperature being 25°C. Spore germination occurred under different conditions of temperature, from 10°C to 35°C, the optimum being 25°C. Spores germinated at relative humidities from 94% to 100%, (-7.027 to 0 MPa) the optimum being between 98% and 100% (-2.768 to 0 MPa). In controlled environment, disease symptoms appeared over a wide range of leaf wetness durations (8 h--36 h) and temperature regimes (15°C--30°C). The most extensive disease symptoms occurred following 36 hours of leaf wetness duration at 30°C. This Phoma sp. survived over winter in infected stubble of lupines of the previous year crop. The infected crop residue may be another source of inoculum of this seedborne pathogen.
Idioma: en