The objective of the trial was to evaluate the efficacy of the ready mix imazapic + imazapyr applied in pre and post-emergence to control purple nutsedge in t corn (hybrid DKB 901 CL) tolerant to imidazolinone under field and greenhouse conditions. The trial was set in randomized blocks with ten treatments and four replicates. Two dosages of imazapic + imazapyr were applied in three different times, pre, early post (15 days after emergence) and normal post emergence (25 days after crop emergence) with and without adjuvants and atrazine. The weed control and injury evaluations were made at 15, 30, and 45 days after spraying in the field. The viability of nutsedge bulbs was evaluated 90 days after corn emergence in the greenhouse. Nutsedge control was reduced when atrazine was added to the imidazolinone herbicides. Although it was not possible to extinguish the nutsedge bulb settings , imazapic + imazapyr reduced multiplication and setting velocity, or both, in 90% when applied in normal post emergence, which is of great value considering the difficulty in controlling this species.
weed; selectivity; resistance
