U of M Gardening Information: What's wrong with my plant?

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Roses > Leaves > Leaves fall off

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Credit: Michelle Grabowski
Credit: Michelle Grabowski
Credit: Michelle Grabowski
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Black Spot
Diplocarpon roseae

Purplish black spots with uneven or feathery edges on leaves
Leaves turn yellow around spots
Leaves fall off
Sometimes reddish purple or black blisters on canes

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Credit: Chad Behrendt
Credit: Janna Beckerman
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Downy Mildew
Peronospera sparsa

Purplish red spots or blotches on leaves, spots often will not grow past major leaf veins
Reddish black spots on canes, petioles and other plant parts
Grey fuzz on underside of leaf when high humidity
Leaves turn yellow and fall off plant
Common in cool wet weather

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Credit: David Zlesak
Credit: David Zlesak
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Rose Streak
Rose Streak Virus

Symptoms are most common on roses with large clusters of small flowers
Symptoms may vary in other cultivars
Leaves turn yellow and may have random dead brown spots
Leaves fall off in the spring or early summer
Very susceptible cultivars have brown to black streaks on the canes

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