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UC IPM Home > Homes, Gardens, Landscapes, and Turf > Vegetables > Diseases
How to Manage Pests
Pests in Gardens and Landscapes
Pest identification
and confirmation—Powdery mildew
Powdery mildew and downy mildew may sometimes be confused. Here are some differing characteristics of
the two.
| Charateristic |
Downy mildew |
Powdery mildew |
| Favorable conditions |
Cool, wet |
Warm, dry |
| Location of white spores on leaves |
Undersides |
Both sides of leaves |
| Occurence of spores |
Only after rain or irrigation |
Abundant even in absence of water |
| Shape of discolored splotches |
Bordered by veins; jagged |
Circular |
| Under hand lens |
Spores on branched stalks |
Spores in chains |
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Spores
of powdery mildew
Spores
of downy mildew
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