Ask a Question forum: Rose disease?

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Name: Jen O.
May 24, 2016 6:25 PM CST
Hi all!

I'm a very novice gardener but I LOVE my roses! I've noticed some spots on some of them and wondering what they are? I have a Natria brand disease / mite / insect spray but it doesn't seem to work on the aphids anyway so I'm not sure if it would work if these spots are from fungus or disease. I'm wondering what the spots are and how to treat them? Thank you!
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Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
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May 24, 2016 7:04 PM CST
Just a vigorous fine spray of water from the hose will wash away the majority of aphids for you. That spotting and damage on the buds might be from the aphids or other sucking insects.

The Natria is a good product, I have some myself but it's a contact insecticide i.e. with aphids you have to physically hit the bugs to kill them. Water works a lot better because you can be sure of full coverage. (and it costs a lot less Green Grin! )

Washing off the insects should always be done in the morning - it's not good practice to wet the leaves of your roses in the evening. Wet leaves all night invite fungal infection. This will show up as spots or fuzzy stuff on the leaves, not damage to the buds so much.

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
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May 24, 2016 7:27 PM CST
Possibly the fungal disease Botrytis which can cause spots on the flowers. Some info from Missouri Botanical Garden:

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