Fusariumspecies from seed of winter wheat in eastern Canada

Effect of harvesting time on incidence of seed-borne Fusarium spp. in spring wheat in eastern Ontario

“…The extent and variation in occurrence of Fusarium spp. observed in the present study in spring wheat are similar to those recorded for seed of spring and winter wheat by Clear and Patrick (1990) and winter wheat by Duthie et al (1986). They reported the same five common Fusarium spp.…”

“…The result also suggests that F. graminearum may have a wider window for infecting wheat seeds than previously recognized. Fusarium sporotrichioides was the most frequently isolated species from winter wheat seed in eastern Canada (Duthie et al 1986), spring wheat seed in Manitoba and winter wheat seed in Ontario during the 1980s (Clear and Patrick 1990). Despite frequent encounters, little information is available on when and how F. sporotrichioides infects wheat.…”

Relation of weather, crop, and soil variables to the prevalence, incidence, and severity of basal infections of winter wheat in Ontario

“…Infection of crowns by species of Fusarium was determined from 40-50 plants per field for a total of 4002 plants taken from 105 fields in 1985 and 5445 plants obtained from 109 fields in 1986. In the laboratory, crowns from plants to be assessed for infection by Fusarium were excised, washed in water, surface sterilized in 75% ethanol (1 minute) and 0.6% sodium hypochlorite (5 minutes), rinsed in sterile water, dried, and placed onto PPA culture medium (containing peptone, salts, antibiotics, and pentachloronitrobenzene) selective for Fusarium (Duthie et al 1986). After several days of incubation under laboratory conditions, the colonies were transferred to potato dextrose agar, incubated at 25°C under continuous fluorescent/long wave ultraviolet light, and identified to species (Nelson et al 1983 Van der Hoeven] were assessed from visual symptoms on 20-30 plants per field for a total of 2650 plants taken from 106 fields in 1985 and 2750 plants taken from 110 fields in 1986.…”

“…The occurrence of species of Fusarium in seed of winter wheat produced in Ontario (Duthie et al 1986) and the epidemiology and control of diseases of the crown and lower stem (Celetti & Hall 1987, Duthie & Hall 1987, Nelson & Sutton 1987, Nelson & Sutton 1988, Sutton 1989) have been examined. However, little quantitative information is available on the occurrence and severity of major fungal infections of the crop in the province or the relative importance of weather, soil, and cultural practices in regulating these infections.…”

“…Partial correlation coefficients (and probability levels) relating average daily temperature in the period of September to June at constant precipitation or constant incidence of grass or cereal to incidence of Fusarium acuminatum, F. avenaceum, and sharp eyespol in winter wheat stem bases in southwesternOntario in 1985 and1986 …”