Fig 6. Fluorescence micrographs showing the suppression of sporulation of P. cubensis in cucumber leaves treated with oxathiapiprolin at 2 or 3dpi (calcofluor and basic aniline blue staining).

A—Leaves treated with oxathiapiprolin of 0.0001–0.01 mg/l at 2 dpi. B—Leaves treated with oxathiapiprolin of 0.1–10 mg/l at 3 dpi. Photos were taken at 10 dpi. Bar = 50 μm. Note numerous sporangiophores and sporangia in the controls, few or deformed sporangiophores in treated leaves, and heavy callose encasement of haustoria at 10 mg/l.