Ocorrência e distribuição de plantas daninhas com característica de resistência a herbicida observada a campo no município de Saudade do Iguaçu – PR

Abstract

The identification of the occurrence of biotypes of weeds characteristic of resistance to herbicides application and its distribution allows to elaborate strategies of management located in the cultivated areas to minimize the dispersion of the weeds . Ahead of this, the objective of the work was to carry out a survey of the occurrence and distribution of weeds with characteristic of resistance in Saudade do Iguaçu - PR. Being this questionnaire the main tool that will be used for the identification of areas with possible focus of resistant weeds to herbicides. The present study was lead in 104 properties with diverse sizes, predominantly, composed for small agriculturists of do Iguaçu in the southwest of Paraná. Part of the used methodology was to the application of a questionnaire in the period of September and October of 2014, it has been found in 43 of thos 104 visited properties harmful plants that with resistance characteristic the field, being that these plants had survived and if had after multiplied the application of Glyphosate in such a way in original the Round up formularizations, Roundoup WG and Roundoup Tranzorb all inhibitors of the EPSPs, that before concentration recommended.