NZPPS   ·  Journal home   ·   Past issues  ·  This volume   ·   Previous abstract   ·   Next abstract

New Zealand Plant Protection 59 (2006): 250-254

Optimal timing for post emergence applications of nicosulfuron for weed control in maize

T.K. James, A. Rahman and M. Trolove


Field trials were conducted over three growing seasons to ascertain optimal timing for post emergence application of nicosulfuron in maize when no pre-emergence herbicides were used. Nicosulfuron (60 g/ha) was applied at 1 to 7 weeks after maize emergence. Dry matter and leaf area of maize plants, grass and broadleaf weeds were determined at the time of treatment. Maize grain yields were used as the major determinant to assess the impact of different timings of post-emergence weed control. The early season (weeks 13) weed control achieved with nicosulfuron was excellent, but subsequent germination of weeds occurred. In weeks 47 the larger weeds took longer to brown off and die back. Results showed that both the biomass and ground cover of weeds were important in determining the duration of the optimal application window. When weeds remained uncontrolled and achieved 100% ground cover, grain yields were significantly reduced. This occurred at weeks 3, 5 and 6 after emergence in the three trials.

Keywords: nicosulfuron, weed control, post-emergence, maize, weed competition.

Related articles
pdfEfficacy of pre-emergence herbicides on three annual grass weeds in different soils
T.K. James and A. Rahman (2009)
New Zealand Plant Protection 62: 356-362
pdfChemical control options for the dicamba resistant biotype of fathen (Chenopodium album)
A. Rahman, T.K. James and M.R. Trolove (2008)
New Zealand Plant Protection 61: 287-291
pdfRelationship between soil seedbank and field populations of grass weeds in maize
A. Rahman, T.K. James, J.M. Mellsop and N. Grbavac (2003)
New Zealand Plant Protection 56: 215-219
pdfWeed competition in maize crop under different timings for post-emergence weed control
T.K. James, A. Rahman and J. Mellsop (2000)
New Zealand Plant Protection 53: 269-272
pdfControl of couch (Elytrigia repens) and mercer grass (Paspalum distichum) in maize with nicosulfuron
T.K. James and A. Rahman (1997)
Proceedings of the NZ Plant Protection Conference 50: 467-471
pdfEffect of adjuvants and stage of growth on the efficacy of three sulfonylurea herbicides on grass weeds
T.K. James and A. Rahman (1994)
Proceedings of the NZ Plant Protection Conference 47: 11-16

Copyright © 2006 New Zealand Plant Protection Society (Inc.).

Please refer to the terms of use.