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Effect of leaf wetness duration and temperature on infection of downy mildew (Peronospora sp.) of basil

Einfluss von Blattnässedauer und Temperatur auf die Infektion von Basilikum mit Falschem Mehltau (Peronospora sp.)

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The effect of leaf wetness duration and temperature on the development of downy mildew of basil, incited by Peronospora sp., was studied under controlled conditions. In several trials carried out under growth chamber and or glasshouse conditions, downy mildew was particularly severe when plants were kept wet for a period of at least 6-12 h immediately after inoculation. The pathogen was mostly active at a temperature of 20†C. At temperatures of 12†C and of 27†C no disease development was observed. A leaf wetness of at least 24 h after symptom appearance is necessary for sporulation. The results obtained are critically discussed also in relation to the possibility of managing this disease through proper cultural practices.


Der Einfluss von Blattnässedauer und Temperatur auf die Entwicklung des Falschen Mehltaus an Basilikum (Peronospora sp.) wurde unter kontrollierten Bedingungen untersucht. Ein hoher Befall trat in Klimakammern und im Gewächshaus besonders nach Nässeperioden von mindestens 6-12 h nach der Inokulation auf. Das Pathogen zeigte die höchste Aktivität bei einer Temperatur von 20†C, während bei 12†C und of 27†C kein Befall beobachtet wurde. Eine Blattnässedauer von mindestens 24 h ist für die Sporulation erforderlich. Die Versuchsergebnisse werden auch im Hinblick auf eine Kontrolle der Krankheit duch geeignete Kulturmaßnahmen kriitisch diskutiert.

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Correspondence to M. L. Gullino.

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Garibaldi, A., Bertetti, D. & Gullino, M.L. Effect of leaf wetness duration and temperature on infection of downy mildew (Peronospora sp.) of basil. J Plant Dis Prot 114, 6–8 (2007).

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