Downy mildew and powdery 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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