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------- Artificial transmission.
* Thines M, Denton GJ, Beal EJ, Kilty A, Denton JO, Shin HD & Choi YJ (2019). Peronospora aquilegiicola sp. nov., the downy mildew affecting columbines in the UK is an invasive species from East Asia. European Journal of Plant Pathology https://doi.org/10.1007/s10658-019-01787-y