Navegando por Autor "Licorini, Leandro Rissieri"

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    Resistência de biótipos de Digitaria insularis (L.) Fedde aos herbicidas glyphosate e clethodim
    (Universidade Estadual do Norte do Paraná, 2014-07-04) Licorini, Leandro Rissieri; Sorace, Maria Aparecida da Fonseca; http://lattes.cnpq.br/0091300533626497; Gandolfo, Marco Antonio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Gandolfo, Marcos Antonio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Bellettini, Silvestre; https://orcid.org/0000-0001-6769-544X; http://lattes.cnpq.br/0540747739983343; Torres, João Pereira; https://orcid.org/0000-0002-7306-9872; http://lattes.cnpq.br/2582950118304206; Inoue, Tadeu Takeyoshi; https://orcid.org/0000-0002-5143-6117; http://lattes.cnpq.br/3756777546721173; Osipe, Robinson; https://orcid.org/0009-0001-9883-9458; http://lattes.cnpq.br/9030513777368487
    The main method used for controlling Digitaria insularis is the chemical by glyphosate. However, the repeated use of glyphosate selected Digitaria insularis biotypes resistant. The ACCase inhibiting herbicides is the main alternative for controlling glyphosate-resistant biotypes. Therefore, the objective of this study was to evaluate the resistance of Digitaria insularis from seeds collected in different places of the State of Parana: Cascavel, Palotina, Maringá, Santa Mariana e Leópolis, for a model to evaluate dose-response curve, taking into account doses variables glyphosate 0; 480; 960; 1920; 2880 and 3840 g a.i. ha-1 and clethodim 0; 48; 96; 192; 288 and 384 g a.i. ha-1. Two experiments were conducted in a completely randomized design in a factorial (5 x 6), with five locals and six doses of herbicides, with five replications. For the first experiment, the herbicide used was glyphosate, and, for the second, clethodim plus (assist mineral oil 1.0 L p.c. ha-1). All doses were equivalent to 0; 0,5; 1; 2; 3 and 4 times the recommended dose of herbicide. The experimental unit was represented by 1 pot 1.0 liter with 1 plant. In Cascavel, Palotina, Maringa and Santa Mariana Digitaria insularis biotypes resistant to glyphosate were found. Moreover, in the areas of Cascavel, Palotina and Santa Mariana, Digitaria insularis biotypes which were not controlled by the recommended doses of clethodim were found, indicating these areas the possibility of multiple resistance.