Biological characteristics and fungicide sensitivity of Pyricularia variabilis

Author:

Zhang Yiming1,Wu Tingguan2,He Yonghong3

Affiliation:

1. Huzhou Vocational & Technical College , Huzhou , Zhejiang 313000 , People’s Republic of China

2. Horticultural Research Institute of Jiangxi Academy of Agricultural Sciences , Nanchang , Jiangxi 330200 , People’s Republic of China

3. College of Plant Protection , Yunnan Agricultural University , Kunming , Yunnan 650201 , People’s Republic of China

Abstract

Abstract In recent years, the pathogen that causes leaf blast on Amomum tsao-ko repeatedly infected the plants in a large area of Luchun County, Honghe Prefecture, Yunnan Province, China. The disease is caused by the pathogen Pyricularia variabilis. The effects of light, temperature, pH, carbon, and nitrogen sources on the growth of the pathogen were determined, and its sensitivity to six fungicides was determined using the mycelial growth rate method. The optimal conditions for mycelial growth were as follows: temperature: 20–25°C; carbon source: maltose, nitrogen source beef extract, media corn flour, and potato dextrose agar. The mycelia could grow under four types of light conditions: 24 h light, 24 h dark, 12 h light/12 h dark, and 16 h light/8 h dark. In addition, Propiconazole was the most effective inhibitor, with an EC50 value of 0.030 μg/mL, and prochloraz was the second most effective, with an EC50 value of 0.076 μg/mL. It is suggested that the two fungicides should be alternated when used in production. Carbendazim and chlorothalonil were ineffective in inhibiting the fungus, with EC50 values of 6.137 and 3.765 μg/mL, respectively.

Publisher

Walter de Gruyter GmbH

Subject

General Agricultural and Biological Sciences,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Neuroscience

Reference23 articles.

1. Leng RD. Cultivation of tsaokuo. Kunming: Yunnan Science and Technology Press; 1986.

2. Zhang YX. Identification of the pathogens causing leaf spot and Liquidambar formosana dry rot. J Yunnan Agric Univ. 2005;20(3):438–40.

3. Lu HJ. A preliminary study on Phytophthora parasitica. J Yunnan Agric Univ. 2007;22(5):773–5.

4. Zhang YM. Identification of the pathogen of leaf blast of Tsao Guo. West Forestry Sci. 2015;44(1):149–51.

5. Odjo T, Diagne D, Adreit H, Milazzo J, Raveloson H, Andriantsimialona D, et al. Structure of African populations of Pyricularia oryzae from rice. Phytopathology. 2021. 10.1094/PHYTO-05-20-0186-R.

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