Open Access

Table 1.

‘Critical periods’ in the powdery mildew development.

Temperatures, °C from ….. to…… Relative humidity, % Leaf wetness period, in hours
9.2–12.4 62–96 21–27
14.0–15.2 60 –95 11–16
16.0–19.9 61–94 8–10
22.5–26.5 60–86 5–6
26.9–29.1 76–92 9–11

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