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Number of results: 3
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Abstract

Reports of weed resistance to herbicides have increased in recent years and differentiation in resistance mechanisms is considered to be a concern for the future of weed science. The aim of this work was to characterize the mechanisms of resistance to herbicides associated with Conyza sp. complex and analyze their implications. Aspects of the action of herbicides commonly used in their control will be addressed, in addition to a description of the mechanisms involved in multiple resistance in Conyza species.
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Authors and Affiliations

Luisa Carolina Baccin
1
ORCID: ORCID
Alfredo Junior Paiola Albrecht
2
ORCID: ORCID
Leandro Paiola Albrecht
2
ORCID: ORCID
André Felipe Moreira Silva
3
ORCID: ORCID
Ricardo Victoria Filho
1
ORCID: ORCID

  1. Fitotecnia, Escola Superior de Agricultura Luiz de Queiroz, Piracicaba, Sãu Paulo, Brazil
  2. Departamento de Ciências Agronômicas, Universidade Federal do Paraná, Palotina, Brazil
  3. Crop Science Pesquisa e Consultoria Agronômica LTDA, Maripá, Paraná, Brazil
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Abstract

The aim of the present work was to evaluate the selectivity of nicosulfuron, alone and in combinations, applied in post-emergence (V4) of glyphosate and sulfonylurea tolerant (RR/STS) soybean. The experiments were conducted in 2015/16 and 2016/17, in Piracicaba – state of São Paulo (SP). In 2016/17, the experiment was also conducted in Palotina – state of Paraná (PR). The experiment was a randomized block design, with four repetitions and 16 treatments, with combinations of nicosulfuron, glyphosate, chlorimuron, sulfometuron and cloransulam, applied alone or in tank mixture. Crop injury and variables related to agronomic performance were evaluated. Data were subjected to analysis of variance and treatment means were compared by the Tukey test. The results obtained are significant in the positioning of herbicides in RR/STS soybean, since in the five experiments, all the treatments were selective, except for glyphosate + sulfometuron which reduced the yield of a cultivar (CD 2630 RR/STS) in the 2015/16 season.
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Authors and Affiliations

Ricardo Victoria Filho
André Felipe Moreira Silva
Alfredo Junior Paiola Albrecht
Damião Vitor Wilson
Ana Ligia Giraldeli
Lucas Rafael de Marco
Henrique Fabrício Placido
Albrecht Leandro Paiola
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Abstract

The “second generation” of glyphosate-tolerant soybean (GT2 soybean) was developed through a different technique of insertion of the glyphosate-insensitive EPSPs gene, in comparison with “first generation” of glyphosate-tolerant soybean. However, there is not enough information available about glyphosate selectivity in GT2 soybean and the effects on the quality of seeds produced. The aim of this study was to evaluate tolerance to glyphosate and seed quality of soybean cultivar NS 6700 IPRO (GT2) with cp4-EPSPs and cry1Ac genes, after application at post-emergence (V4). The experiment was conducted in a randomized block design with four replicates and seven treatments, or rates of glyphosate (0; 720; 1,440; 2,160; 2,880; 3,600; 4,320 g of acid equivalent − a.e. · ha−1). Assessments were performed for crop injury, SPAD index and variables related to agronomic performance and seed quality. A complementary trial with the same cultivar and treatments in a greenhouse was conducted in a completely randomized design with four replications. Data analysis indicated no significant effect of glyphosate on V4 on agronomic performance and physiological quality of seeds, for two growing seasons. The soybean cultivar NS 6700 IPRO (GT2), with cp4-EPSPs and cry1Ac genes, was tolerant to glyphosate up to the maximum rate applied (4,320 g a.e. · ha−1) at post-emergence (V4). The quality of soybean seeds was not affected by glyphosate up to the maximum rate applied (4,320 g a.e. · ha−1) at post-emergence (V4).

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Authors and Affiliations

André Felipe Moreira Silva
Alfredo Junior Paiola Albrecht
Leandro Paiola Albrecht
Victor Aparecido Pellicci
Bruno Flaibam Giovanelli
Giovani Apolari Ghirardello
Henrique Rodrigues Milagres Viana
Ricardo Victoria Filho

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