TITLE:
Direct versus Indirect Herbicide Effects: The Example of Preplant Incorporated Halosulfuron
AUTHORS:
Zhenyi Li, Rene Van Acker, Nader Soltani, Peter H. Sikkema
KEYWORDS:
Dry Bean, Halosulfuron, Navy Bean, White Bean, Weed Emergence
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.8 No.4,
March
3,
2017
ABSTRACT: The potential indirect
effects of soil applied herbicides have not been adequately explored. The
objective of this study was to explore the potential and relative importance of the indirect effects of halosulfuron
applied preplant incorporated (PPI) on several weed species common in
white bean fields in Ontario. Halosulfuron
applied PPI at 35 g ai ha-1 delayed common lambsquarters and wild mustard emergence and
reduced their densities over 70%. It did not
delay green foxtail emergence, but the density was decreased over 30%. Indirect
herbicidal effects such as delayed emergence timing may be important for
weed management in non-competitive crops such as white bean. Based on these results, the indirect effects of
soil applied herbicides are real and are potentially important for providing
additional prevention of yield loss in field crops. This may be
particularly important for relatively non-competitive crops such as white bean
and for reducing weed seed return to the seedbank.