What Is Causing Mold On Leaves Of A Coral Drift Rose?

Filed Under: Roses, Diseases and Fungus · Keywords: What Is Causing, Mold, Leaves, Coral Drift, Rose · 4001 Views
We have had a lot of rain recently and I've noticed what appears to be a mold like substance on the leaves. Should I be concerned?

Rate It 2

Comment about this question »

2 Answers

Answer #1 · Maple Tree's Answer · Hi M-Overhead watering or a lot of rain can cause fungal diseases. With all the rain you have received most likely the foliage is not drying quickly early in the day. If days have been cloudy this makes it even harder for any moisture on the leaves to dry. Roses are very susceptible to Black Spot fungal disease when moisture is allowed to stay on the foliage for any period of time. Black spot disease typically begins as black spots on the foliage and are most prevalent on upper leaf surfaces. Leaves eventually begin to yellow around the spots, then become all yellow and fall off. The spots may also appear on rose canes, first being purple and then turning black. Roses are also susceptible to Powdery Mildew but this fungal disease is usually caused by warm daytime temperatures with cool moist or humid nights. With Black Spot, any infected foliage or stems should be pruned out and any fallen leaves should be raked up and discarded in the trash. Do not add any infected stems and foliage to a compost pile. These fungal diseases should be treated along with pruning out infected parts of the roses. I noted a link below to an article that will help you with the treatment of these diseases. The article will give you some products and application tips on the treatment of your roses. Just click on the link to go directly to the article.


I uploaded a few pictures of Black Spot and Powdery Mildwew on rose leaves for you to see. Let me know if these resemble what you are seeing on your roses.

Please ask if you have any other questions.


Answer Images:
Picture about What Is Causing Mold On Leaves Of A Coral Drift Rose? Picture about What Is Causing Mold On Leaves Of A Coral Drift Rose? Picture about What Is Causing Mold On Leaves Of A Coral Drift Rose?

Comment about this answer »
Rate It 2

Answer #2 · Gardenality.com's Answer · Typically, the Drift Roses are resistant to many of the foliar diseases other less-resistant roses are susceptible to. That being said, if they aren't getting much sunlight, especially in the morning, fungus and disease, such as powdery mildew, will show up on the leaves. Where I'm at in central Georgia we've had copious amounts of rainfall and cloud cover over the past couple years that has kep both foliage and soil very wet for extended periods of time. This fall was so wet that it caused problems with all types of roses, including the Drift and even the Knock Out roses. Most of the roses in my garden defoliated way early this year. I'm crossing my fingers that in spring they'll all leaf out normally...if we don't have more heavy rainfall that is. I'll be pruning my Drift Roses back to about 6 inches above the ground and my Knock Outs to about 15 inches above ground as usual in late winter. We'll see what happens.

You might want to consider spraying the foliage of your roses with a fungicide or a product containing neem oil, which usually control powdery mildew very quickly. If you see black spots on the leaves that are on the plant and leaves that have fallen to the ground, make sure to remove these. When I prune my roses in late winter, I'll be raking up all the mulch and fallen leaves from around the plants and putting down fresh mulch.

Keep us posted as to how your roses do next spring and let us know if you need more details or have any other questions.)

Comment about this answer »
Rate It 1

Post An Answer To This Question:

Can't find your answer? Click here to ask your question.

Read Tips On How To Give A Great Answer

Click here to learn how to give a great answer »


View All My Gardenaltiy Updates »