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    Farming & Crop Protection Powdery mildew (strawberry)

    Powdery mildew (strawberry) [Podosphaera aphanis]

    Serious problems may occur especially under glass and protective sheeting.

    overview

    Powdery mildew (strawberry) - Image 1

    Powdery mildew (strawberry) - Image 1

    Powdery mildew (strawberry) - Image 2

    Powdery mildew (strawberry) - Image 3

    Powdery mildew (strawberry) - Image 4

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      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).

      Treatment

      Prevention

      Mildew-resistant varieties are preferable for cultivation. The affected leaves must be trimmed in summer. A fungicide program should be initiatedat the beginning of infestation.