Biological Characterization and Fungicide Sensitivity of <i>Dactylobotrys graminicola</i> Causing Oat Spikelet Rot in China
Oat (<i>Avena sativa</i>) is a significant cereal crop that is extensively cultivated in temperate regions and is suitable for growth at higher elevations. The damage degree and epidemic area of oat spikelet rot caused by <i>Dactylobotrys graminicola</i> are generally increas...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-10-01
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| Series: | Agronomy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4395/14/10/2314 |
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| Summary: | Oat (<i>Avena sativa</i>) is a significant cereal crop that is extensively cultivated in temperate regions and is suitable for growth at higher elevations. The damage degree and epidemic area of oat spikelet rot caused by <i>Dactylobotrys graminicola</i> are generally increasing and spreading. Mycelium growth rate method was used to identify biological characteristics and in vitro fungicide screenings of <i>D. graminicola</i>. The results show that sorbitol and casein tryptone were the best carbon and nitrogen source for the <i>D. graminicola</i>, respectively. The optimal temperature for mycelium growth and conidia production of the <i>D. graminicola</i> was 20 °C; meanwhile, an acidic environment was shown to be conducive to mycelia growth, and alkaline facilitated conidia production. Among the ten tested fungicides, 20% Pydiflumetofen showed the best inhibition rate, with an EC<sub>50</sub> (concentration for 50% of maximal effect) value of 0.005 mg/L; 30% Difenoconazole Propiconazole and 35% Metalaxyl-M Fludioxonil also showed sufficient inhibitory effects against <i>D. graminicola</i>, with EC<sub>50</sub> value of 0.05 mg/L and 0.04 mg/L. Furthermore, we used artificial inoculation to determine the effectiveness of fungicide control in field, Trifloxystrobin 10%-Tebuconazole 20% with more than 90% control effectiveness, followed by 20% Pydiflumetofen. The results of this study not only revealed the biological characteristics of <i>D. graminicola</i>, but also provided effective candidate fungicides for the prevention and control of oat spikelet rot disease. |
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| ISSN: | 2073-4395 |