Revista Brasileira De Herbicidas 2001; 2(1-2): 7-12
Efficacy of herbicide mixtures in the control of an Euphorbia heteropylla biotype tolerant to acetolactate synthase in soybean
An experiment was conducted under field conditions to study the efficacy of the herbicides lactofen, irnazethapyr, chlorimuron-ethyl, cloransulam-metil, oxasulfuron, and flumiclorac-pentil, alone and in combination with lactofen, for E. heterophylla control in soybeans. The E. heterophylla biotype was supposed to be tolerant to herbícides whose mechanísm of action is on ALS enzyme ínhibition. The best treatment in absolute terms was lactofen at 120 g/ha plus Attach 0.2 % as sequential applicatíons. However, lactofen + imazethapyr (120+50 g/ha), lactofen + oxasulfuron (120+45 g/ha), lactofen + flumiclorac-pentil (120+40 g/ha), lactofen (120 g/ha) + Attach 0.2 %, lactofen (120 g/ha), lactofen + cloransulam-methyl (120+ 30 g/ha) and lactofen + chlorimuron-ethyl (120+ IO g/ha) were not statiscally dífferent (5% probability). It should be pointed out that the control of the biotype was considered medi um, therefore indicating that additional studies should be carried out to verify in which conditions mixtures of protox inhibitors with ALS inhibiting herbicides should be recommended considering the tolerance of the biotype to imazethapyr and chorimuron-ethyl that were components of some herbicide mixtures.
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