Phytopathology (1996) 86, p. S120 (Crozier et al.)

J.B. Crozier and E.L. Stromberg (1996)
Management for suppression of take-all in soft red winter wheat in Virginia
Phytopathology 86 (11 suppl.), S120-S120
Abstract: Take-all of wheat, caused by the fungus Gaeumannomyces graminis (Sacc.) Arx and Oliver var. tritici Walker (Ggt) is a problem wherever wheat (Triticum aestivum L.) is grown. Although Virginia's wheat yields have increased steadily over the past 15 years due to the introduction of intensive management practices, take-all has been observed in many of the intensively managed fields. Crop rotation is currently the only recognized effective method for control. Seed dressings, source of nitrogen (NH₄⁺ or NO₃^-), and application of Mn²⁺ may be possible means of control. Field trials have been inconsistent due to the variability of the disease within fields. We have developed a glasshouse bioassay to determine the effect of amendments on take-all incidence and severity. Plants were grown in Conetainers in a sieved and dried sandy loam coastal plain field soil from the Eastern Virginia Agric. Exp. Stn. Laboratory infested millet (Setaria italica L.) seed was mixed into the planting soil as inoculum at a 1% w/w ratio. Plants were grown for approximately 30 days. Root area was measured using a flatbed scanner (HP Scanjet 3c) and an area program (Analyzer, 1991, non-commercial software), and dry shoot weight was collected. Amendments of NH₄⁺ suppressed take-all and NO₃^- enhanced take-all as expected, while Mn²⁺ did not suppress take-all. Work is underway to evaluate the potential for take-all control by several bacterial and chemical seed treatments.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Gaeumannomyces tritici	Wheat (Triticum)	U.S.A. (NE)