Uso de herbicidas para o controle de biótipos de Euphorbia heterophylla resistentes a inibidores da PROTOX e ALS
Euphorbia heterophylla, popularly known as dairy, is a species that has had a major negative impact on annual crops in Brazil, decreasing grain yield and commercial value. In 2004, the first case of multiple resistance of dairy to ALS and PROTOX inhibitors was reported. The aim of the project will b...
| Autor principal: | Frizon, Gilvane |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2021
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/24578 |
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| Resumo: |
Euphorbia heterophylla, popularly known as dairy, is a species that has had a major negative impact on annual crops in Brazil, decreasing grain yield and commercial value. In 2004, the first case of multiple resistance of dairy to ALS and PROTOX inhibitors was reported. The aim of the project will be to analyze whether pre-emergence PROTOX and ALS inhibitor herbicides are more efficient in controlling different susceptible and resistant dairy populations than post-emergence applications. The experiment will be developed in a completely randomized design with three replications. The experiment was carried out between March and May 2019, in a 3 x 4 x 4 three-factor arrangement. The first factor was the susceptible Euphorbia heterophylla biotypes from São Paulo and the multidrug resistance biotypes of ALS and PROTOX Vilhena. and Vitorino. The second factor will be composed of the herbicides, diclosulam flumioxazin, sulfentrazone, and imazethapyr. The third factor is the herbicide application modality, in pre or early emergence by herbicide dose proportions (0x, 0.5x, 1.0x, 2.0x and 4.0x). Said dose ratios correspond to the following herbicide doses: diclosulam (0, 17.51, 35, 70, 140 g ha-1), flumioxazin (0, 10, 20, 40, 80 g ha-1), sulfentrazone (0.200, 400, 800, 1600 g ha-1) and imazethapyr (0.50, 100, 200, 400 g ha-1). Sulfentrazone herbicide was the most efficient for the control of all biotypes, both in pre and post-emergence application, which was corroborated by the RF values. The control levels provided by the herbicide flumioxazin were higher in post-emergence mode than in pre-emergence for Vitorino and Vilhena biotypes, which was corroborated by the RF values. The recommended dose of imazethapyr and diclosulan herbicides resulted in low levels of control of all evaluated biotypes, both pre-emergence and post-emergence, with the exception of the good efficiency presented by diclosulan (pre- or post-emergence) on the Sao Paulo biotype. |
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