Fig 1. The suppressive effect of heat treatments at 25, 30, 35, 40 and 45°C on sporulation capacity of mycelium of Peronospora belbahrii in inoculated basil leaves.

A- Capacity of P. belbahrii to sporulate on infected basil plants after exposure to heat treatments for 3, 6, 9, 17 and 27 h at 7 dpi. B- The effect of mycelium age on the capacity of P. belbahrii to sporulate on infected basil plants after exposure to heat treatments for 9 h at 5, 7, 9 dpi. C- Spore production in leaves of intact basil plants exposed to heat treatments for 12 h at 5 dpi. D-Re-sporulation in infected leaves collected from the field, spores being first washed out and exposed to heat treatments for 20 h. E- Capacitiy of P. belbahrii to sporulate on infected basil plants after 3 consecutive daily exposures of 3 hours each to heat treatments at 7 dpi. Exposures were applied at 2, 3 and 4 dpi or 4, 5 and 6 dpi. Different letters indicate significant differences between means at α = 0.05 [Tukey HSD (honest significant difference) test].