Common bean tolerance to herbicides applied in sugarcane crop

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.