Identification, Biological Characteristics and Field Control Efficacy of Venturia inaequalis in Yuexi County

doi:10.11924/j.issn.1000-6850.casb2024-0450

Abstract

Abstract:

In order to clarify the species, biological characteristics, and the control agents of the pathogen of apple scab in Yuexi County, the pathogen was identified and analyzed based on the molecular biology and morphological characteristics, and the biological characteristics of pathogen were studied in different culture medium, pH, carbon source and nitrogen source. The field control effects of 5 common fungicides were studied. The results showed that the pathogen causing apple scab in Yuexi County was identified as Venturia inaequalis. The optimum culture medium was wheat bran agar medium, the optimum pH was 7-8, the optimum carbon source was glucose, and the optimum nitrogen source was peptone. The field control results showed that the five fungicides could effectively control apple scab, and the control effect of 20% pydiflumetofen was the best, with the control effect was 89.54%. The order of the control effect was 20% pydiflumetofen SC> 20% pydiflumetofen·difenoconazole SC> 40% flusilazole EC> 50% kresoxim-methyl WG> 36% thiophanate-methyl SC. The above results showed that 20% pydiflumetofen, 20% pydiflumetofen·difenoconazole and 40% fluosilazole can be applied as reference pesticides for controlling V. inaequalis in field.

Key words: Yuexi County, apple scab, identification, biological characteristics, field control, control effect, fungicide

ZHANG Haiting, YE Jianrong, XU Bingzhi, ZENG Shuocheng, FU Huijuan, LI Xingyue, LI Qiyong, ZHANG Hong, YI Jun. Identification, Biological Characteristics and Field Control Efficacy of Venturia inaequalis in Yuexi County[J]. Chinese Agricultural Science Bulletin, 2025, 41(7): 115-120.

Figures/Tables 7

References 23

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杀菌剂	病叶率/%	病情指数	防治效果/%
50%醚菌酯WG	28.00±2.00b	3.11±0.22b	72.55±1.96c
36%甲基硫菌灵SC	28.00±2.00b	3.11±0.22b	72.55±1.96c
20%氟酰羟·苯甲唑SC	12.00±2.00cd	1.33±0.22c	88.24±1.96ab
40%氟硅唑EC	14.67±1.15c	1.63±0.13c	85.62±1.13b
20%氟唑菌酰羟胺SC	10.67±1.15d	1.19±0.13c	89.54±1.13a
清水(CK)	52.00±2.00a	12.30±0.84a

杀菌剂	病叶率/%	病情指数	防治效果/%
50%醚菌酯WG	28.00±2.00b	3.11±0.22b	72.55±1.96c
36%甲基硫菌灵SC	28.00±2.00b	3.11±0.22b	72.55±1.96c
20%氟酰羟·苯甲唑SC	12.00±2.00cd	1.33±0.22c	88.24±1.96ab
40%氟硅唑EC	14.67±1.15c	1.63±0.13c	85.62±1.13b
20%氟唑菌酰羟胺SC	10.67±1.15d	1.19±0.13c	89.54±1.13a
清水(CK)	52.00±2.00a	12.30±0.84a