TITLE:
Weed Management in Spring Planted Cereals with Mesotrione
AUTHORS:
Nader Soltani, Christy Shropshire, Todd Cowan, Peter H. Sikkema
KEYWORDS:
Barley; Durum Wheat; Height; Herbicide Sensitivity; Oats; Tolerance; Yield; Wheat
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.1,
January
21,
2014
ABSTRACT:
There is little information on the efficacy of
mesotrione for the control of broadleaved weeds in spring planted cereals under
Ontario environmental conditions. A total of eight studies were conducted in
Ontario over a two-year period (2010 to 2011) to evaluate cereal tolerance
and weed control efficacy of mesotrione applied preemergence (PRE) at 25, 50,
100, 140, and 280 g ai ha-1 in spring planted barley, durum wheat, oats, and
wheat. Mesotrione, applied preemergence at the rates evaluated, caused no injury in either year in spring planted
barley, durum wheat, oats, or wheat evaluated at 1, 2 and 4 week after emergence (WAE). The predicted
mesotrione rate required to give
adequate control of AMBEL, CHEAL, POLCO and SINAR was generally greater than
280 g ai ha-1. The average yield of the weedy check was
81% of the weed-free check. According to the exponential to maximum regression, the mesotrione rates required to give 90%, 95%
and 98% of the weed-free check were 15, 30 and 45 g ai ha-1,
respectively. To provide yield equivalent to the standard treatment of
bromoxynil/MCPA, 36 g ai ha-1 of mesotrione was needed. Based on these results, mesotrione
applied preemergence at 25, 50, 100,
140, and 280 g ai ha-1 can be safely
used in spring planted barley, durum wheat, oats, and wheat.
However, greater than 280 g ai ha-1 of mesotrione was needed to
adequately control AMBEL, CHEAL,
POLCO and SINAR.