TITLE:
Weed Control with Halosulfuron Applied Preplant Incorporated, Preemergence or Postemergence in White Bean
AUTHORS:
Nader Soltani, Robert E. Nurse, Christy Shropshire, Peter H. Sikkema
KEYWORDS:
Efficacy, Dry Bean, Phaseolus vulgaris, Preemergence (PRE), Preplant-Incorporated (PPI), Postemergence (POST), Sensitivity, Tolerance
JOURNAL NAME:
Agricultural Sciences,
Vol.5 No.10,
August
28,
2014
ABSTRACT: Four field trials
were conducted over a three-year period (2011-2013) at various locations in Ontario
to evaluate the level of weed control provided by halosulfuron applied PPI,PREor POST at 17.5, 35 and 70 g·ai·ha-1 in white bean. Halosulfuron applied PPI or PRE at
17.5, 35 and 35 g·ai·ha-1 caused 2% or less visible injury 1 and 4 WAA in
white bean. However, halosulfuron applied POST at 17.5, 35 and 70 g·ai·ha-1 caused 2% - 8% and 1% - 3% white bean injury at 1
and 4 WAA, respectively. There was no decrease in white bean seed yield
relative to the weed free check due to weed interference with halosulfuron
applied PPI or PRE at doses evaluated, except when applied PRE at 17.5 g·ai·ha-1 which
resulted in a decrease in seed yield of 25%. Weed interference caused a
decrease in white bean yield of 47%, 42% and 44%, when halosulfuron was applied
POST at 17.5, 35 and 70 g·ai·ha-1, respectively. Halosulfuron applied PPI, PRE and POST controlled AMARE
92% - 100%, 85% - 99% and 47% - 75%; CHEAL 95%
- 100%, 83% - 99% and 36% - 51%; and SINAR 97% - 100%, 99% - 100% and
100%, respectively. Halosulfuron applied PPI and PRE reduced AMARE density 93% -
97% and 75% - 95%; CHEAL density 89% - 98% and 81% - 93%; and SINAR density 99%
- 100% and 99% - 100%, respectively. Halosulfuron applied PPI and PRE reduced dry
weight of AMARE 96% - 98% and 86% - 96%; CHEAL 96% - 98% and 87% - 93%; and
SINAR 100% and 100%, respectively.
Halosulfuron applied POST at rates evaluated reduced SINAR density and dry weight 100% but caused no significant reduction in AMARE and CHEAL density
or dry weight compared to the weedy check. Based on these results, halosulfuron applied PPI orPREat 35 g·ai·ha-1 can be used safely for the control of selected
broadleaf weeds in white bean production.