EFICIÊNCIA DE HERBICIDAS APLICADOS EM PÓS-EMERGÊNCIA NA CULTURA DO FEIJÃO-CAUPI

Abstract

The objective of this work was to evaluate the efficiency of herbicides in the diet of cowpea. Two randomized blocks with four replications were conducted. In the first trial, an available mixture [bentazon + imazamox] associated or not to haloxypop-β-methyl, fenoxaprop-β-ethyl, fluazifop-β-butyl, quizalofop-β-tefuryl, clethodim and tepraloxydim was tested. And after the test [bentazone + imazamoxi], imazethapyr, bentazone + imazethapyr, ethoxysulfuron + bentazone, were tested against haloxypop-β-methyl. Treatments were included as weed and non-weed controls. The ready mix of [bentazone + imazamoxi] was selective to BRS guava beans and 90% of Alternanthera tenella, Commelina benghalensis and Nicandra physaloides and did not control Eleusine indica, Cenchrus echinatus and Glycine max. The imazetapir associated or not to bentazone were selective to cowpea, but moderate or poor control was promoted for A. tenella, C. benghalensis, E. indica, C. echinatus and soybean tiguera. The application of imazethapyr + bentazone showed excellent control of N. physaloides. 55% of phytotoxification was observed at 7 days after application of ethoxysulfuron + bentazone (DAA) and a partial series of symptoms at 28 DAA (16%). However, cowpea was tolerant to the herbicides ethoxysulfuron + bentazone. A mixture of ethoxysulfuron + bentazone was more than 87% for N. physaloides and 100% for tigesa, but deficient (<60%) for A. tenella, E. indica and C. echinatus and moderate (> 70%) for C benghalensis. For the control of E. indica and C. echinatus it was necessary to use the graminicides.