Disease · 97 plants in our database
Powdery mildews

Which plants
Where you will find it.
Signs and protection differ by plant — the exact steps are on each plant’s page.
African MarigoldTagetes erectaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Anise hyssopAgastache foeniculumWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
AstilbeAstilbe ×arendsiiFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
BasilOcimum basilicumFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Batchelor's-ButtonCentaurea cyanusFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Bay laurelLaurus nobilisFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Belgian endive (witloof)Cichorium intybus (Witloof Group)From spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Bigleaf hydrangeaHydrangea macrophyllaWhite powdery coating on leaves and shoots.
Protection for this plant →
Bigleaf lupineLupinus polyphyllusWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Bloody cranesbillGeranium sanguineumFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
BorageBorago officinalisFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
BugleAjuga reptansFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Busy lizzieImpatiens wallerianaWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Butternut squashCucurbita moschataFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Candle larkspurDelphinium elatumFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Carmichael's monkshoodAconitum carmichaeliiFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
CatmintNepeta ×faasseniiFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Cherry laurelPrunus laurocerasusSpring – autumnWhite powdery coating on leaves and shoots.
Protection for this plant →
Chinese wisteriaWisteria sinensisFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Climbing hydrangeaHydrangea petiolarisFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
ColumbineAquilegia vulgarisFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Common foxgloveDigitalis purpureaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common hazelCorylus avellanaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common honeysuckleLonicera periclymenumFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common lungwortPulmonaria officinalisFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Common medlarMespilus germanicaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common ninebarkPhysocarpus opulifoliusWhite powdery coating on leaves and shoots.
Protection for this plant →
Common PoppyPapaver rhoeasFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common sageSalvia officinalisFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common sunflowerHelianthus annuusFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Common yarrowAchillea millefoliumFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Common zinniaZinnia elegansFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
CorianderCoriandrum sativumFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
CranberryVaccinium macrocarponWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
CucumberCucumis sativusFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Fall phloxPhlox paniculataFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Feathered pinkDianthus plumariusWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
FennelFoeniculum vulgareFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Fraser photiniaPhotinia × fraseriFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
French marigoldTagetes patulaWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Garden chrysanthemumChrysanthemum × morifoliumWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Garden dahliaDahlia ×pinnataFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Garden roseRosa (Garden Hybrids)White powdery coating on leaves and shoots.
Protection for this plant →
GauraOenothera lindheimeriWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Grape vineVitis viniferaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Greater masterwortAstrantia majorFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Hardy geraniumGeranium macrorrhizumFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Hardy plumbagoCeratostigma plumbaginoidesFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Honey locustGleditsia triacanthosFrom spring onwardsWhite powdery patches on leaves, stems and flowers, often on the upper side of the leaf; leaves stunted or distorted.
Protection for this plant →
HoneyberryLonicera caerulea var. kamtschaticaWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Hybrid violetViola × wittrockianaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Japanese anemoneAnemone ×hybridaFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Japanese euonymusEuonymus japonicusWhite powdery coating on leaves and shoots.
Protection for this plant →
Japanese spireaSpiraea japonicaWhite powdery coating on leaves and shoots.
Protection for this plant →
Lemon balmMelissa officinalisFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
LingonberryVaccinium vitis-idaeaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
MelonCucumis meloFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
MonkshoodAconitum napellusFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
New England asterSymphyotrichum novae-angliaeFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Orange coneflowerRudbeckia fulgidaFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Oregon grapeMahonia aquifoliumWhite powdery coating on leaves and shoots.
Protection for this plant →
Oriental poppyPapaver orientaleWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Panicle hydrangeaHydrangea paniculataWhite powdery coating on leaves and shoots.
Protection for this plant →
PeaPisum sativumFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
PeppermintMentha ×piperitaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Plains eryngoEryngium planumFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Pot MarigoldCalendula officinalisFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
PrimrosePrimula vulgarisWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Purple coneflowerEchinacea purpureaFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Purpletop vervainVerbena bonariensisWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
RadicchioCichorium intybus (Radicchio Group)From spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Red horse chestnutAesculus × carneaFrom spring onwardsWhite powdery patches on leaves, stems and flowers, often on the upper side of the leaf; leaves stunted or distorted.
Protection for this plant →
Rose of SharonHibiscus syriacusWhite powdery coating on leaves and shoots.
Protection for this plant →
RosemarySalvia rosmarinusFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Russian sagePerovskia atriplicifoliaFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
RutabagaBrassica napus var. napobrassicaFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Saw-toothed hydrangeaHydrangea serrataWhite powdery coating on leaves and shoots.
Protection for this plant →
Scarlet beebalmMonarda didymaFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Shasta daisyLeucanthemum × superbumWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Smooth hydrangeaHydrangea arborescensWhite powdery coating on leaves and shoots.
Protection for this plant →
SpearmintMentha spicataFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Sweet mock orangePhiladelphus coronariusWhite powdery coating on leaves and shoots.
Protection for this plant →
Sweet peaLathyrus odoratusFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
TarragonArtemisia dracunculusFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
TurnipBrassica rapa subsp. rapaFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Tussock bellflowerCampanula carpaticaWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
WatermelonCitrullus lanatusFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
Wax begoniaBegonia (Semperflorens-Cultorum Group)White powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
White mulberryMorus albaFrom spring onwardsWhite powdery coating on leaves, stems and flowers; leaves may become distorted.
Protection for this plant →
Winter squashCucurbita maximaFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →
WintercreeperEuonymus fortuneiWhite powdery coating on leaves and shoots.
Protection for this plant →
Woodland sageSalvia nemorosaFrom spring onwardsWhite powdery coating on leaves and stems; leaves curl and dry out.
Protection for this plant →
Woolly hedgenettleStachys byzantinaFrom spring onwardsWhite powdery coating on leaves and stems.
Protection for this plant →
Zucchini, pumpkinCucurbita pepoFrom spring, especially later in the seasonWhite powdery coating on leaves, stems and flowers.
Protection for this plant →Sources (131)
- rhs.org.uk 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91
- plants.ces.ncsu.edu 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
- homegarden.cahnr.uconn.edu
- missouribotanicalgarden.org 2 3 4 5
- ipm.ucanr.edu 2
- hortsense.cahnrs.wsu.edu
- extension.usu.edu
- ipm.missouri.edu
- lfl.bayern.de
- umass.edu
- pddc.wisc.edu
- extension.purdue.edu
- cals.cornell.edu
- hgic.clemson.edu 2
- extensionaus.com.au
- www1.agriculture.alberta.ca
- pnwhandbooks.org 2
- yardandgarden.extension.iastate.edu
- ipm.cahnr.uconn.edu














