Serious problems may occur especially under glass and protective sheeting.
Powdery mildew (strawberry) [Podosphaera aphanis]
The susceptibility of the varieties is very diverse. The first infection must be expected when the temperatures exceed 10 degrees C for several days. Rain and cool weather inhibit the development of the fungus.
Pattern of damage
The underside of infected leaves and the pedicels are covered with a white mycelium (Picture 1). The leaves roll upwards and the leaf edges turn red (Pictures 2 & 3). Infected fruit is covered with white powder (Picture 4).