Reduced rates of herbicides applied to imidazolinone-resistant sunflower crossbred with Brachiaria ruziziensis
| Autor: | M. D. Muller, Wadson Sebastião Duarte da Rocha, Carlos Eugênio Martins, Alexandre Magno Brighenti, F. Souza Sobrinho, Carlos Renato Tavares de Castro |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
geography
Acetolactate synthase geography.geographical_feature_category Brachiaria ruziziensis biology Randomized block design Imazapyr biology.organism_classification Pasture Sunflower chemistry.chemical_compound Animal science Agronomy chemistry Helianthus annuus biology.protein Phytotoxicity Agronomy and Crop Science |
| Zdroj: | Helia. 34:49-58 |
| ISSN: | 1018-1806 |
| DOI: | 10.2298/hel1154049b |
| Popis: | The aim of this study was to evaluate the tolerance of sunflower (Helianthus annuus) to acetolactate synthase (ALS)-inhibiting herbicides and to temporarily delay the growth of Brachiaria ruziziensis, avoiding competition and allowing pasture reestablishment. Experiment 1 consisted of a randomized complete block design, with four replicates. Hybrid Paraiso 102 CL (Clearfield ®, resistant to ALS-inhibiting herbicides) was a subject of the following treatments: I) 30 g ai ha-1 imazethapyr; II) 70 g ai ha-1 imazethapyr; III) 75 g ai ha-1 imazapyr; IV) 125 g ai ha-1 imazapyr; V) 7.5 g ai ha-1 chlorimuron-ethyl; VI) 12.5 g ai ha-1 chlorimuron-ethyl; VII) 8 g ai ha-1 nicosulfuron; VIII) 20 g ai ha-1 nicosulfuron; IX) unhoed check and X) hoed check. Experiment 2 consisted of a split-plot design with randomized complete blocks and four replicates. Two genotypes, Paraiso 102 CL and Embrapa 122 (susceptible to ALS-inhibiting herbicides), were sowed on the plots and subplots were submitted to the following treatments: I) hoed check, II) unhoed check, III) 100 g ai ha-1 imazethapyr, IV) 250 g ai ha-1 imazapyr, V) 25 g ai ha-1 imazapyr, VI) 60 g ai ha-1 nicosulfuron, and VII) 4 g ai ha-1 nicosulfuron. Imazethapyr (30, 70 and 100 g ai ha-1), imazapyr (25, 75 and 125 g ai ha-1) or nicosulfuron (4, 8 and 20 g ai ha-1) had no phytotoxic effects on imidazolinone- resistant sunflower (Paraiso 102 CL). However, chlorimuron-ethyl (7.5 and 12.5 g ai ha-1), imazapyr (250 g ai ha-1) and nicosulfuron (60 g ai ha-1) were highly phytotoxic to Paraiso 102 CL. All herbicide treatments produced marked injury symptoms on Embrapa 122. Pasture reestablishment was observed for all herbicide treatments, except for imazapyr (125 and 250 g ai ha-1) and nicosulfuron (60 g ai ha-1). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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