Data/hora: 02/06/2024 14:48:07

Provedor de dados: | 87
País: | Brazil
Título: | CROSS-RESISTANCE OF RICE FLATSEDGE TO ALS-INHIBITING HERBICIDES
Autores: | CHIAPINOTTO,D.M.; SCHAEDLER,C.E.; FERNANDES,J.P.S.; ANDRES,A.; LAMEGO,F.P.
Data: | 2017-01-01
Ano: | 2017
Palavras-chave: | Oryza sativa; Cyperus iria; Dose-response curve; Resistant biotype.
Resumo: | ABSTRACT Cyperus iria (CYPIR) is one of the main weeds in irrigated rice crops. The intense chemical control with acetolactate synthase (ALS) inhibiting herbicides favors the selection of cross-resistance. This study aimed to evaluate the crossresistance of CYPIR to ALS-inhibiting herbicides in irrigated rice in Rio Grande do Sul. Two experiments arranged in a factorial scheme, in a completely randomized design, with four replications were conducted. Experiment I consisted of resistant (CYPIR-R) and susceptible (CYPIR-S) biotypes and ALS-inhibiting herbicide doses: imazethapyr (106 g a.i. ha-1); pyrazosulfuron-ethyl (20 g a.i. ha-1); penoxsulam (36 g a.i. ha-1) and, as an alternative herbicide, bentazone (960 g a.i. ha-1); corresponding to 0; 1/16; 1/8; 1/4; 1/2; 1; 2; 4; 8 and 16x (x = maximum registered dose). Experiment II followed the same procedures, with doses of 0; 1/64; 1/32; 1/16; 1/8; 1/4; 1/2; 1 and 2x for CYPIR-S and 0; 1/2; 1; 2; 4; 8; 16; 32; 64 and 128x for CYPIR-R; including bispyribac-sodium (50 g a.i. ha-1). The variables evaluated were: visual control at 7, 14, 21 and 28 days after the treatments (DAT) and shoot dry matter (SDM) at 28 DAT. The results, fitted by nonlinear regression, show varied and high levels of cross-resistance of CYPIR-R to ALS-inhibiting herbicides from the group of imidazolinones, sulfonylureas, triazolopyrimidines and pyrimidinyl(thio)benzoates. Bentazone can be used as an alternative herbicide, however, not exclusively in the control of this biotype.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100266
Editor: | Sociedade Brasileira da Ciência das Plantas Daninhas
Relação: | 10.1590/s0100-83582017350100068
Formato: | text/html
Fonte: | Planta Daninha  v.35 2017
Fonte: | info:eu-repo/semantics/openAccess