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Field trials in Waikato, Bay of Plenty and Manawatu investigated the efficacy of preand post-emergence herbicides for weed control in maize crops planted early, mid or late season with prior cultivation or into a stale seedbed. Achieving good control of broadleaf weeds was easier than for annual grass weeds. Some weed species germinated over a long period from spring to summer months. The residual activity of pre-emergence herbicides was not sufficient for season-long control of such weeds in the early and mid planted crops and a post-emergence herbicide was essential to control them and to maintain grain yields. When grass weeds were dominant, the preand post-emergence combination still did not provide season long control in the early plantings. In late planted crops, weed control was also poor in the absence of a post-emergence herbicide even though few weeds were present at the post-emergence application time. The weed seedbank was reduced where good weed control was achieved.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Optimising time of planting and herbicide aplication for control of problem weeds in maize