Powdery Mildew

Pest: Powdery mildew (caused by different fungi)

Pest Type: Infectious disease, fungi

Major Identifying Features: White, powdery mycelial and spore growth that forms on leaf surfaces and shoots, sometimes on flowers and fruits, new growth may be dwarfed and distorted

Life Cycle: All powdery mildew fungi require living plant tissue to grow, it can survive over winter by building strands in buds or spherical fruiting bodies on the bark of branches, most fungi grow as thin layers of mycelium on the surface of plant parts, spores are produces in chains on upper and lower leaf/flower/fruit surfaces

Pest Rating: Moderate

Management Rating: Difficult

Host/Season/Outbreak Information: Some species require cold and moist climate and other species like hot and or dry conditions, wind carries spores to new hosts

Damage Information: Powdery mildew can be serious on woody species such as rose, crape myrtle, and sycamores where it attacks new growth including buds, shoots, flowers, and leaves

Management Options: Prevention is the best method to manage powdery mildew by avoiding susceptible cultivars, planting plants in full sun, and appropriate cultural practices, and chemical applications with fungicide (especially in roses) such as oils and sulfur, biological control with biological fungicides such as Serenade, WARNING ON THE USE OF CHEMICALS

Sources:

http://www.ipm.ucanr.edu

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