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Baseline sensitivity and control efficacy of fluazinam against Sclerotinia sclerotiorum in Henan Province, China
Author(s) -
Liu Shengming,
Jiang Jia,
Che Zhiping,
Tian Yuee,
Chen Genqiang
Publication year - 2019
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12774
Subject(s) - sclerotinia sclerotiorum , carbendazim , biology , fungicide , mycelium , sclerotinia , horticulture , botany
Sclerotinia stem rot, caused by Sclerotinia sclerotiorum , is a devastating disease in Henan Province, of the main rapeseed production areas in China. Fluazinam belongs to the broad‐spectrum phenylpyridinamine fungicides, which have high activity in inhibiting the mycelial growth of S. sclerotiorum . In this study, 191 field isolates were obtained from different oilseed rape fields in Henan Province, before being exposed to fluazinam in 2015. The baseline sensitivity of S. sclerotiorum to fluazinam was established. The effective concentration for 50% inhibition of mycelial growth (EC 50 ) ranged from 0.0019 to 0.0337 μg/ml, and the mean EC 50 value was 0.0084 ± 0.0055 μg/ml. The range of the frequency distribution was narrow. The results of a cross‐resistance assay revealed no cross‐resistance between fluazinam and carbendazim, dimethachlone, boscalid or fludioxonil. Field efficacy tests showed that the control efficacies of fluazinam (50% WG) applied at 150, 225 and 300 g ai ha −1 were 67%, 73% and 88%, respectively. In contrast, the control efficacies of boscalid (50% WG) and carbendazim (50% WP) applied at 225 and 1,500 g ai ha −1 were 71% and 52%, respectively.