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Ciência Rural

Print version ISSN 0103-8478On-line version ISSN 1678-4596

Cienc. Rural vol.45 no.9 Santa Maria Sept. 2015


Press Release

Research demonstrates efficacy of alternative herbicides in control of imidazolinone-resistant red rice

Guilherme Vestena Cassol

Luis Antonio de Avila

1Universidade Federal de Santa Maria - Fitotecnia Santa Maria, RS Brazil

2Universidade Federal de Pelotas - Fitossanidade Caixa Postal 354 Pelotas Rio Grande do Sul 96.010-900 Brazil T: 53 81250417 E-mail:

Researchers from the Federal University of Pelotas, Pelotas, and the Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul state, Brazil, showed that imidazolinones-resistant red rice biotypes can be controlled by total action alternative herbicides as glyphosate and glufosinate. The article was published in Ciência Rural journal, v.45, n.9, of September 2015.

The study aimed to evaluate the sensitivity of imidazolinone-resistant red rice to non-selective herbicides commonly used in areas of irrigated soy-rice rotation in the state of Rio Grande do Sul. For this, the researchers identified two biotypes of red rice as susceptible and resistant to imidazolinones. These biotypes were sprayed with imazapyr + imazapic, glyphosate and glufosinate herbicides under nine concentrations. The researchers used non-linear regression analysis of the log-logistic type to estimate the sensitivity of biotypes to herbicides.

According to the results, the red rice biotype resistant to imidazolinone demonstrated greater GR50 when compared to susceptible biotypes. The researchers also observed similar values of GR50 for both biotypes treated with glyphosate and glufosinate. The results indicate that these herbicides effectively control red rice biotypes resistant to imidazolinone when recommended doses to control susceptible biotypes are used.

For researchers Guilherme Cassol and Luis Avila, this research breaks new ground by showing the use of resistant biotypes to the imidazolinone and its sensitivity to alternative herbicides. The study information may be used in the management of weeds in crop rotation systems, diversifying herbicide modes of action, which prevents the development of red rice resistance.

Researcher: Guilherme Cassol and Luis Avila E-mail:

Creative Commons License This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.