Tolerância do feijoeiro a herbicidas aplicados na cultura da cana-de-açúcar

Abstract

This work was aimed to evaluate the selectivity of main herbicides used in sugar cane crop applied in pre or post emergence conditions to common bean (“Jalo” Group – cultivar “Jalo Precoce”). In pre emergence modality the treatments evaluated consisted of: ametryn (2.500 g ha -1 ), tebuthiuron (800 g ha -1 ), [hexazinone + diuron] (237.6 + 842.4 g ha -1 ), metribuzin (1,440 g ha -1 ), clomazone (800 g ha -1 ), isoxaflutole (112.5 g ha -1 ), sulfentrazone (600 g ha -1 ), imazapic (105 g ha -1 ), trifluralin (1,800 g ha -1 ), S-metolachlor (1,920 g ha -1 ), and a check without herbicide application. In post emergence modality treatments evaluated were: MSMA (1,440 g ha -1 ), MSMA + diuron (1,080 + 420 g ha -1 ), [hexazinone + diuron] (237.6 + 842.4 g ha -1 ), metribuzin (1,440 g ha -1 ), ametryn (1,500 g ha -1 ), [ametryn + trifloxysulfuron sodium] (1,280 + 32.4 g ha -1 ), halosulfuron (112.5 g ha -1 ), 2.4-D (1,005 g ha -1 ) and mesotrione (120 g ha -1 ) besides a check without herbicide application. Phytointoxication, stand, plant height, wet and dry matter of shoots, number of plants at harvest, height of first pod insertion, and grain yield were evaluated. S-metolachlor, tebuthiuron, trifluralin and clomazone herbicides showed satisfactory selectivity to bean plants cv. Jalo Precoce, when applied in pre-emergence. However, ametryn [hexazinone + diuron], metribuzin, isoxaflutole, sulfentrazone and imazapic were not selective, even in pre-emergence applications. None of tested herbicides showed selectivity conditions for being used in post-emergence in one bean integrated cultivation system (cv. Jalo Precoce) in areas with sugar cane crop production.