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[SANET-MG] roudup use linked to increased fusarium disease in spring wheat
There is a link between roundup use and fusarium disease in spring
wheat. No or minimal til using roundup seems to lead to accumulation and
overwintering of fusarium in the crop debris. There is a similar effect
related to roundup and fusarium sudden death syndrome in soy.
Published in Crop Sci 45:1908-1916 (2005)
Crop Production Factors Associated with Fusarium Head Blight in Spring
Wheat in Eastern Saskatchewan
M. R. Fernandeza,*, F. Sellesa, D. Gehlb, R. M. DePauwa and R. P. Zentnera
a Semiarid Prairie Agricultural Research Centre, Agriculture and
Agri-Food Canada, P.O. Box 1030, Swift Current, SK, Canada S9H 3X2
b Indian Head Research Farm, Agriculture and Agri-Food Canada, P.O. Box
760, Indian Head, SK, Canada S0G 2K0
Fusarium head blight (FHB) has been increasing in western regions of the
Canadian Prairies. The objective of this 4-yr study was to identify crop
production factors (CPF), associated with FHB development in spring
wheat (Triticum aestivum L.). From 1999 to 2002, 659 crops were sampled
in eastern Saskatchewan for FHB levels, and information gathered on
agronomic practices used on these fields. In 2000 and 2001, percent
Fusarium-damaged kernels (FDK) was also determined. Differences in the
FHB index among years indicated that environment was the most important
factor affecting disease development. The effects of CPFs on FHB were
lower in years with high (2001) and low (1999 and 2002) disease
pressure, compared with a year with moderate (2000) disease pressure.
Previous application of glyphosate [N-(phosphonomethyl)glycine]
formulations (GF) within tillage system, tillage system, previously
grown crop, and cultivar susceptibility were the only CPFs that affected
FHB. GF application in the previous 18 mo within tillage system was
significantly associated with higher FHB levels every year; it was the
only CPF in 1999, and one of two CPFs in 2002, that affected FHB,
suggesting that its effect was not influenced as much by environmental
conditions as that of other CPFs. Percentage FDK was also higher in
fields previously treated with GF in 2000 and 2001. Because of the
nature of this study, we could not determine if the association between
previous GF use and FHB development was a cause–effect relationship.
Thus, further research is needed to elucidate the nature of this
association and the underlying mechanisms.
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