subscribe
YouTube
Pinterest
Twitter
Facebook
Instagram
Search

How Do I Prevent Rose Black Spot?

By: Jessie Keith

“Please give me advice on the prevention of black spot before it occurs.” Question from Carol of Drums, Pennsylvania

Answer: Black spot (Diplocarpon rosae) is such an annoying fungal disease of roses. Here are six measures to help prevent it:

1. Clean your bushes in fall and winter. Remove all fallen leaves and any dead branches from your rose bushes. The fungus overwinters on dead, infected plant material.

2. Apply a dormant oil spray before roses leaf out in spring. Dormant oil sprays deter fungal diseases existing on the plant. (Click here to learn more about horticultural oil sprays.)

3. Prune roses to promote aeration. Moisture on the leaves helps fungal diseases, like black spot, take hold. (That’s why roses grown in dry climates have fewer disease problems.) Prune off extra branches and sprouts to open up plants and help prevent black spot. (Click here to learn more about how to prune roses.)

4. Space roses to promote aeration. Space your roses according to nursery recommendations. Overcrowding can encourage foliar moisture and subsequent fungal problems.

5. Plant roses in full sun. When you plant roses in full sun, their foliage dries faster, which creates a less favorable environment for black spot to proliferate.

6. Water roses from the bottom. Bottom water your roses to help keep their leaves dry.

I hope that these tips help!

Happy rose growing,

Jessie Keith

Black Gold Horticulturist

About Jessie Keith


Plants are the lens Jessie views the world through because they’re all-sustaining. (“They feed, clothe, house and heal us. They produce the air we breathe and even make us smell pretty.”) She’s a garden writer and photographer with degrees in both horticulture and plant biology from Purdue and Michigan State Universities. Her degrees were bolstered by internships at Longwood Gardens and the American Horticultural Society. She has since worked for many horticultural institutions and companies and now manages communications for Sun Gro Horticulture, the parent company of Black Gold. Her joy is sharing all things green and lovely with her two daughters.

2 Comments

  1. Jessie Keith

    You are welcome! I hope that black spot troubles you less this year. Best, Jessie

Leave a Reply

Content Disclaimer:

This site may contain content (including images and articles) as well as advice, opinions and statements presented by third parties. Sun Gro does not review these materials for accuracy or reliability and does not endorse the advice, opinions, or statements that may be contained in them. Sun Gro also does not review the materials to determine if they infringe the copyright or other rights of others. These materials are available only for informational purposes and are presented “as is” without warranty of any kind, express or implied, including without limitation warranties of merchantability, fitness for a particular purpose, and non-infringement. Reliance upon any such opinion, advice, statement or other information is at your own risk. In no event shall Sun Gro Horticulture Distribution, Inc. or any of its affiliates be liable to you for any inaccuracy, error, omission, fact, infringement and the like, resulting from your use of these materials, regardless of cause, or for any damages resulting there from.

While we have made every effort to ensure the information on this website is reliable, Sun Gro Horticulture is not responsible for any errors or omissions, or for the results obtained from the use of this information. All information in this site is provided “as is”, with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information.

Use of this site is subject to express terms of use. By using this site, you agree to our Terms of Use

View Our Privacy Policy