Return to the Roses Forum | Post a Follow-Up

 o
Is this Chlorosis?

Posted by katefisher Z7_NorthernCA (My Page) on
Tue, May 12, 09 at 13:58

A couple of pictures of two roses in the back bed. Last year these were small but very happy, healthy green and bloomy. They were actually greener a few weeks ago then they are now. I've noticed especially in the past two weeks that the leaves on most of one one plant and part of another (they're the same and unnamed) have suddenly turned a rather icky yellowish color. I've never seen this on my roses before. I know what over watering looks like out there and this isn't it. I would greatly appreciate any thoughts on the matter. Thank you.

By the by both of these guys have and have had RMV forever. I trim off the really affected parts and they normally shine on despite that fact.

Kate

Photobucket

Photobucket

Photobucket

Photobucket

Photobucket


Follow-Up Postings:

 o
RE: Is this Chlorosis?

Hi, Kate.

Is the red leaf margin normal on this variety?

Technically, "chlorosis" just means "yellowing," so, yes, they definitely have chlorosis :)

Yellowing between greener veins starting on the new growth is iron deficiency. I presume the leaves did not suddenly turn pale but grew out pale over the past two weeks. The newest leaves are normally the most chlorotic. In picture #2 it looks like one cane has yellow foliage and another does not. In this case the cane might be damaged.

There is iron in the soil but it is unavailable because of high pH, or possibly just because the soil is cold and wet. Check pH, add sulfur if needed, and use an iron product for a short-term fix.


 o
RE: Is this Chlorosis?

Hi Michael.

Yes, the leaves on these roses do have that red margin. I'm sorry I should have noted it.

Gotcha on the terminology. I learned something:)

You are most correct about how the leaves turned slowly. It took me a little to notice in fact. I'll look for damage on the canes as well and if necessary do some trimming.

So checking the pH. I have not done this before but presume I can maybe get some kind of testing tool at the hardware store. Not 100% certain what the pH should be in fact. I need to do more investigating apparently.

Thank you so much for your input. Very appreciated.

Kate


 o
RE: Is this Chlorosis?

I'd start with looking for cane damage. The second one in particular looks like classic winter damage near the base of the cane.


 o
The software is annoying me

Since Kate knows how to prune, I wouldn't think the whole plant in picture 1 is sitting on damaged stubs, but perhaps the one cane in picture 2 is. It seems to have blind growth, which is another indicator.

I use the inexpensive Rapi-Test meter to check pH, but if you don't have a way, you could just slop some iron on the first plant. If the problem recurs, treat the soil with sulfur, which will slowly lower the pH.


 o
RE: Is this Chlorosis?

In the long run, for us, treating the soil with sulfur has been the most durable solution to this problem.

Jeri


 o
RE: Is this Chlorosis?

Thank you all very much. When I get home I will look more carefully at both plants for physical damage to the canes.

Living up here in a rather small town our little hardware store has finite supplies of, well, everything. So my second task will be to check with them and see if they have iron, sulfur or the pH tester available and go from there.

Kate


 o
RE: Is this Chlorosis?

Definitely look at the canes first because it appears that there is very healthy foliage and distressed foliage on the same plant but on different canes. The weak cane is probably damaged but there could be damage at the graft assuming it is a grafted rose. You might also look at the healthy cane for symptoms like yellowing which would indicate that the weaker cane may be dying from something that will eventually get the stronger cane in which case there is another problem probably at the root level.


 o
RE: Is this Chlorosis?

Thanks Henry.

Well miraculously when I called my hardware store they had precisely one pH tester in stock and Michael it is the Rapi-Test so I'm going to get that this evening. That will be nice to have around I'm sure and as you and Jeri pointed out it will help identify the issue. I'll let you know what I discover.

Kate


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Roses Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here