We had a bad powdery mildew year in 2008. Powdery mildew control starts with plant selection. Choose plants that are not susceptible to powdery mildew or those varieties that have been bred or selected for powdery mildew resistance. The following is a list of plants where powdery mildew is common.
Some of the more common hosts of powdery mildews include: apple and crabapple, azalea and rhododendron, ash, basswood, beech, Berberis, birch, blueberry, buckeye, catalpa, Chinese photinia, chrysanthemum, cotoneaster, crape myrtle, dahlia, delphinium, elm, eucalyptus, euonymus, flowering dogwood, gardenia, hawthorn, holly, honeysuckle, horse chestnut, hydrangea snowball, kalanchoe, Kalmia, leucothoe, ligustrum, lilac, Lonicera, lilac, magnolia, maple, monarda, oak, phlox, Prunus (peach, plum, cherry, apricot), pear, peony, poplar, privet, pyracantha, Reiger begonia, roses, serviceberry, spirea, smoke-tree, snapdragon, sycamore, tulip tree, Vaccinium, viburnum, walnut, wintercreeper, willow, wisteria, and zinnia.
Information from the Plant and Pest Advisory from Rutgers University http://njaes.rutgers.edu/pubs/plantandpestadvisory/2008/ln0918.pdf
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