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



New Zealand Plant Protection 62 (2009): 356-362

Efficacy of pre-emergence herbicides on three annual grass weeds in different soils

T.K. James and A. Rahman

ABSTRACT

Pot experiments evaluated the efficacy of several pre-emergence herbicides on three annual grasses that are major problem weeds in most maize growing regions. Herbicides evaluated included alachlor, metolachlor, dimethenamid, two formulations of acetochlor, and proprietary mixes of acetochlor with atrazine or metribuzin. Pots were filled with soil collected from the top 10 cm of seven maize (Zea mays) fields with different cropping histories, and seeded with test grasses. Herbicides were applied immediately after sowing with a precision glasshouse sprayer. Additional seeds were sown at 2-weekly intervals for 8 weeks. Seedlings were counted 2 weeks after each planting. Metolachlor was most effective in controlling summer grass (Digitaria sanguinalis) and rough bristle grass (Setaria verticillata). All herbicides were less effective against the large seeded broom corn millet (Panicum miliaceum) than the other grasses. All the herbicides except metolachlor were less effective in soils with a long history of maize growing.

Keywords: maize, herbicide efficacy, grass weeds, chemical control, Setaria verticillata, Digitaria sanguinalis, Panicum miliaceum.

Related articles
pdfHerbicide efficacy on three annual grass weeds in soils with different cropping histories
A. Rahman and T.K. James (2010)
New Zealand Plant Protection 63: 66-71
pdfOptimising time of planting and herbicide aplication for control of problem weeds in maize
T.K. James, A. Rahman and M. Trolove (2007)
New Zealand Plant Protection 60: 183-188
pdfOptimal timing for post emergence applications of nicosulfuron for weed control in maize
T.K. James, A. Rahman and M. Trolove (2006)
New Zealand Plant Protection 59: 250-254
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
pdfField persistence of some maize herbicides in two soils
A. Rahman and T.K. James (1994)
Proceedings of the NZ Plant Protection Conference 47: 6-10

Copyright © 2009 New Zealand Plant Protection Society (Inc.).

Please refer to the terms of use.