There is limited information on the effect of saflufenacil application timing when applied in autumn to winter wheat. Five field experiments were conducted over a three-year period (2007- 2009) at two locations (Ridgetown and Exeter, Ontario) to evaluate the tolerance of winter wheat to autumn applications of saflufenacil applied pre-plant (PP), pre-emergence (PRE), or post-emergence (POST) at 25, 50, 100 and 200 g a.i. ha-1. As the dose of saflufenacil increased, the amount of injury observed also increased. By May of the following spring, injury ranged from 11 to 20% at the 25 to 200 g a.i. ha-1 doses of saflufenacil. Saflufenacil applied PP and PRE caused little to no injury in winter wheat. Saflufenacil applied POST and POST + Merge in the autumn caused up to 41% injury with the POST + Merge application being the most injurious. However, this injury was transient with no effect on winter wheat height or yield the following summer.
References
[1]
Frihauf, J.C., Stahlman, P.W. and Geier, R.W. (2010) Winter wheat and weed response to postemergence saflufenacil alone and in mixtures. Weed Technol. 24, 262-268.
[2]
Lyon, D.J. and Kniss, A.R. (2010) Proso millet tolerance to saflufenacil. Weed Technol. 24, 349-355.
[3]
Moran, M.E. (2010) Pree-mergence and postemergence interactions of saflufenacil in corn (Zea mays L.). MSc thesis, University of Guelph, Guelph, Ontario, Canada.
[4]
Sikkema, P.H., Shropshire, C. and Sol-tani, N. (2008) Tolerance of spring barley (Hordeum vulgare L.), oats (Avena sativa L.) and wheat (Triticum aestivum L.) to saflufenacil. Crop Prot. 27, 1495-1497.
[5]
Soltani, N., Shropshire, C. and Sikkema, P.H. (2010) Sensitivity of leguminous crops to saflufenacil. Weed Technol. 24, 143-146.
[6]
Frihauf, J.C., Stahlman, P.W., Geier, P.W. and Peterson, D.E. (2010) Winter annual broadleaf weeds and winter wheat response to postemergence application of two saflufenacil formulations. Weed Technol. 24, 416-424.
[7]
Geier, P.W., Stahlman, P.W. and Charvat, L.D. (2009) Dose responses of five broadleaf weeds to saflufenacil. Weed Technol. 23, 313-316.
[8]
Knezevic, S.Z., Datta, A., Scott, J. and Charvat, L.D. (2010) Tolerance of winter wheat (Triticum aestivum L.) to pre-emergence and post-emergence application of saflufenacil. Crop Prot. 29, 148-152.
