Baseline-sensitivity of Botrytis cinerea to pydiflumetofen and its efficacy on tomato gray mold in Hebei Province, China

Zhao, Jianjiang; Wu, Jie; Lu, Fushen; Bi, Qiuyan; Yang, Kexin; Xiao, Han; Wang, Wenqiao

doi:10.1016/j.cropro.2022.105989

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…This study found a positive cross-resistance between penthiopyrad and boscalid, fluopyram, or pydiflumetofen. In previous studies, positive cross-resistance was found to exist between fluopyram and boscalid or pydiflumetofen [20,34]. These reports were similar to the findings of this study.…”

Section: Discussionsupporting

confidence: 92%

“…The baseline sensitivity for conidial germination was significantly lower than that for mycelial growth. Similar results have been reported by predecessors in the sensitivity baseline of B. cinerea to boscalid, isopyrazam and pydiflumetofen [17,20,24]. These results can probably be interpreted as that the germination of conidia is highly demanding in energy in the fungal developmental stage [25].…”

Section: Discussionsupporting

confidence: 87%

“…The resistance levels were classified by Resistance Factor (RF: the EC 50 value of the isolate/baseline-sensitivity of B. cinerea to penthiopyrad) [19]. If RF < 10, the isolate was considered sensitive (S) to penthiopyrad, 10 ≤ RF < 50 indicated low resistance (LR) to penthiopyrad, 50 ≤ RF < 100 represented moderate resistance (MR) to penthiopyrad, and RF > 100 indicated high resistance (HR) to penthiopyrad [19,20].…”

Section: Detection Of B Cinerea Resistance To Penthiopyradmentioning

confidence: 99%

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Baseline Sensitivity and Resistance of Botrytis cinerea to Penthiopyrad in Hebei Province, China

Yang

et al. 2022

Horticulturae

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Tomato gray mold (TGM), caused by Botrytis cinerea, is a destructive disease of greenhouse tomatoes. Its control mainly depends on the application of chemical fungicides. In China, penthiopyrad has been registered for the management of TGM for about 3 years. In this study, the baseline sensitivity of B. cinerea to penthiopyrad was measured based on mycelial growth and spore germination, using 131 wild isolates collected from Hebei Province. The mean EC50 values 1.054 ± 0.633 mg/L (on mycelial growth) and 0.101 ± 0.037 mg/L (on conidia germination) were used as the baseline sensitivity. Isolates (187) of B. cinerea, sampled from eight regions in Hebei province during 2021 and 2022, were used for resistance studies by mycelial growth method. Based on the resistance factor, these isolates were considered: sensitive (=65 isolates), low (=39 isolates), moderate (=38 isolates), and high (=45 isolates) resistance. All 15 isolates from Raoyang were sensitive to penthiopyrad. Four mutation types in the sdhB subunit, namely H272R, N230I, P225F, and P225L, were associated with the resistance to penthiopyrad. A positive cross-resistance was also recorded between penthiopyrad and fluopyram, boscalid, or pydiflumetofen. These results provide useful information on the chemical control of TGM.

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Section: Discussionsupporting

confidence: 92%