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A Database for Triticeae and Avena
GSP: Genome Specific Primers
Query Data Types
Links to Related Sites
Agriculture and Agri-Food Canada (AAFC)
The Triticeae Toolbox
USDA-ARS Small Grains Genotyping Labs
U.S. Wheat and Barley Scab Initiative
Two Point Data
GrainGenes Pathology Report: Take-All
Gaeumannomyces graminis var. tritici
Gaeumannomyces graminis var. avenae
Take-All spreads from infested wheat residue and is most severe where consecutive wheat crops have been grown. Infection and development favored by soil temperatures of 50 to 68 F; neutral to alkaline soil pH; wet, poorly drained soils; and N, P and K deficiencies. Initial infection occurs as root growth through the soil intercepts infested plant residue, and can occur throughout the season. Localized plant- to-plant spread often occurs where roots of healthy plants intercept or cross roots of neighboring diseased plants. Root infections eventual progress to the crown and lower stems. turning them a shiny black to dark brown in appearance. Severely infected wheat plants also appear stunted and uneven in height. Tillers die prematurely, resulting in white heads bearing few or no kernels. Heavy use of nitrate-based fertilizers also favor take-all. Bromegrasses (Bromus species) and wheatgrasses (Agropyron species) including quackgrass (A. repens) are alternate hosts.
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Pruned roots and crown rot symptoms...
Symptoms of take-all on wheat...
Foot rot symptoms of take-all...
Dark mycelial strands and perithecial initials...
A patch of spring wheat...
Wheat spikes and grain...
Lower culms and roots...
Dark mycelial strands and perithecial initials of O. graminis...
A mature perithecium of O. graminis...
Ascospores of O. graminis (10x40).
Take-all in wheat...
Severe disease [Take-All]...
(1993) Winter wheat disease management
Insect and plant disease management handbook
(1987) Compendium of wheat diseases.