Sensitivity of field isolates of Botryotinia ricini to fluazinam and thiophanate-methyl
| Autor: | Caroline de Oliveira Datovo, Dartanhã J. Soares |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Veterinary medicine Pesticide Biology biology.organism_classification 01 natural sciences Fungicide 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology chemistry Thiophanate-methyl Botryotinia Potato dextrose agar Fluazinam Mycelium 010606 plant biology & botany EC50 |
| Zdroj: | Tropical Plant Pathology. 44:205-208 |
| ISSN: | 1983-2052 |
| DOI: | 10.1007/s40858-018-0241-1 |
| Popis: | This study aimed to determine the sensitivity of 61 Botryotinia ricini isolates to the fungicides fluazinam and thiophanate-methyl. The isolates were originated from Goias (n = 3), Maranhao (n = 3), Mato Grosso (n = 12), Minas Gerais (n = 1), Paraiba (n = 8), Rio Grande do Sul (n = 19) and Sao Paulo (n = 15) states. Mycelial discs (6 mm) removed from 5-day-old colonies were transferred to Petri dishes containing potato dextrose agar (PDA) amended with different concentrations of the fungicides. Two perpendicular measurements of the radial growth were taken and used to calculate the percentage of mycelial growth inhibition (PMGI) for each treatment (isolate × fungicide × concentration) in relation to the control. PMGI were used to obtain the effective concentration that inhibits 50 and 95% of the mycelial growth (EC50 and EC95) by means of linear regression. For fluazinam, the EC50 and EC95 (mean ± SD) were 0.1738 ± 0.0802 μg/mL and 0.7938 ± 0.1254 μg/mL, while for thiophanate-methyl, the EC50 and EC95 were 0.3487 ± 0.0963 μg/mL and 1.1325 ± 0.2063 μg/mL, respectively. Both fungicides have high intrinsic toxicity to B. ricini but fluazinam was a more potent growth inhibitor compared to thiophanate-methyl. |
| Databáze: | OpenAIRE |
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