APSnet Feature - Control of Powdery Mildew Using the UC Davis Powdery Mildew Risk Index - Image - Stunted shoot covered with mycellium of Uncinula necator (flag shoot) that grew from an infected bud.

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Stunted shoot covered with mycellium of Uncinula necator (flag shoot)
that grew from an infected bud.

Photograph courtesy R. C. Pearson