ABSTRACT In January 2025, severe white mould symptoms were observed on cucumber fruits ( Cucumis sativus L.) from plants grown under shade netting in Navolato, Sinaloa, Mexico. Morphological characterisation enabled the identification of Sclerotinia sclerotiorum , and its identity was confirmed through phylogenetic analysis using ITS region sequences. Isolates of S. sclerotiorum were inoculated onto cucumber fruits (European and pickling types), producing typical symptoms of fruit rot and white mould. In the in vitro sensitivity assay, five S. sclerotiorum isolates were evaluated and exhibited EC 50 value ranges of 0.0098–0.0204, 0.0068–0.0570, 0.0006–0.0031, and 0.0968–3.1648 μg mL −1 for the fungicides pydiflumetofen, pyraclostrobin, fluazinam, and thiophanate‐methyl, respectively. This study provides relevant information for the diagnosis and management of white mould in cucumber crops.
Contreras‐Soto et al. (Sun,) studied this question.