Determination of Host Range of Coniella fragariae and Indoor Bioagent Screening
- Received Date: 31/08/2021
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Key words:
- Paeonia veitchii Lynch /
- root rot disease /
- C. fragariae /
- host range /
- biological fungicides
Abstract: In order to clarify the host range of Coniella fragariae, a pathogen of root rot disease of Paeonia veitchii Lynch, and screen effective biocides, the pathogenicity test was conducted on 12 species of plants, including P. veitchii, cherry and peony by leaf stabbing inoculation method, and the antifungal effect of 8 biological fungicides on C. fragariae was determined by mycelial growth rate. The results showed that the pathogen can infect the leaves of P. veitchii, cherry, peony, rose, apple, pomegranate and walnut, but could not infect the leaves of pear, hawthorn, bamboo, yellow poplar and holly. The inhibitory effect of 0.3% eugenol on C. fragariae was the best with only 0.130 5 mg/L of EC50, and followed by 3% Zhongshengmycin with 4.225 6 mg/L of EC50. The antifungal effect of 8% ningnanmycin, 6% kasugamycin, 4% pyrimidine nucleoside antimicrobials, 10% polycxins and 500 million Paenibacillus polymyxa was poor, with EC50 value of 63.586 8 mg/L, 72.167 3 mg/L, 293.900 3 mg/L, 360.950 0 mg/L and 405.708 1 mg/L, respectively. The inhibitory effect of 24% Jinggangmycin on root rot of P. veitchii was the worst, and the inhibitory effect was not obvious. The results of this study provide theoretical basis for the diagnosis and control of P. veitchii root rot in the field.