Effects of fusarium head blight and seed treatment on germination, emergence, and seedling vigour of spring wheat
1995
Gilbert, J. | Tekauz, A.
In 1993, following the worst fusarium head blight epidemic on record in southern Manitoba, two seed lots of each of the hard red spring (HRS) wheat cvs. Glenlea, Katepwa, and Roblin, the durum cv. Sceptre, and the Canada Prairie Spring (CPS) cv. AC Taber were tested for germination, emergence, dry weights of shoot and root, and response to seed cleaning and fungicide seed treatment. Seed treatment fungicides included DB-Green L, Dithane M-45, NM Drill Box, Vitaflo 280, and Vitavax S. Sound seed from 1992 and both cleaned and uncleaned seed from 1993 were used as controls. Fusarium graminearum was the predominant species isolated from the 1993 seed. Seed of Sceptre durum was of very poor quality; cleaning did not improve grade and fungicide treatment had minimal effect on germination or emergence. Cleaning reduced tombstone levels in Katepwa, Glenlea, and Roblin, and improved the grade of the latter two cultivars. Fungicide treatments generally improved germination and emergence but efficacy was dependent on temperature at germination and cultivar. Dry shoot weight in Glenlea was significantly lower than in controls after treatment with DB-Green L and Dithane M-45: no other significant differences in dry shoot weight were recorded. Dry root weight of plants from 1993 seed, treated and untreated, was significantly less than that of 1992 control seed, and seed treatment did not affect root weight.
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