Please help...something is damaging my roses

vintage_roses(7)April 28, 2011

I have noticed this problem for the past two weeks and it seems to be getting worse. I have been spraying Bayer disease control every week, to build up the immunity, and then I was going to continue with a every two week spraying regimen. I am wondering if this is damage from the spray (it's also been hot hear in the upper 80's), or if this is something else. I have fertilized them, but it was about 2 months ago. I have also notice mole/vole tunnels in my rose beds. Please help! It's much appreciated...

As far as the blooms go, they are all normal, it's the leaves that show damage. New growth hasn't shown any damage so far. The leaves start out with a yellow and the leaves end up turing brown around the edges. This is occurring on most of my roses...

Here are the pictures:

new growth looking healthy

Thanks so much!

Emma G.

Thank you for reporting this comment. Undo
michaelg(7a NC Mts)

Here is a picture showing the "Christmas Tree" pattern of magnesium deficiency. It is interveinal chlorosis with some green remaining between the yellow and the vein itself.

Dr. Malcolm Manners says boron can cause the same symptom if the soil is acid, so a pH check is called for.

Here is a link that might be useful: UF image

    Bookmark   April 28, 2011 at 5:33PM
Thank you for reporting this comment. Undo
michaelg(7a NC Mts)

It is almost surely a nutritional deficiency, probably magnesium if it is on the older rather than new leaves. Magnesium can be supplied by Epsom Salts, 2 TB per plant. However the deficiency can be caused partly by high soil pH or an excess of some other nutrient such as potassium. You might want to get a soil test.

    Bookmark   April 28, 2011 at 6:03PM
Thank you for reporting this comment. Undo
vintage_roses(7)

michaelg,

thanks for the quick reply....how do I get my soil tested? I will purchase the Epson salt this weekend and will treat the roses right away. Will this deficiency totally kill the rose eventually if left untreated?

    Bookmark   April 28, 2011 at 7:44PM
Thank you for reporting this comment. Undo
michaelg(7a NC Mts)

In most states, inexpensive soil tests are available through the extension service. Look in the phone book, under the county, for "cooperative extension" or "agricultural extension." If you get a test, you can bring the results here.

I doubt it would kill the plants, but affected leaves will not function much, and the symptoms will gradually spread up the cane.

BTW the boron symptom is caused by an excess, not a deficiency, and according to Dr. Manners when pH is below 5.5.

    Bookmark   April 29, 2011 at 10:32AM
Sign Up to comment
More Discussions
Are There Any Roses You Regret Buying?
I've already discarded many dozens so I'd better not...
ingrid_vc so. CA zone 9
Sidewalk Flowers
by JonArno Lawson, illustrated by Sydney Smith I'm...
bellegallica9
HRG SEMINAR! May 2, San Juan Bautista, CA
By tomorrow, I hope to have this up on the Heritage...
jerijen
Any ID ideas on this old Sonoma Mission rose?
This rose is a low bush (to 80 cm) growing under a...
dkelch
Black Gold Natural Organic Fertilizer?
Has anyone used this with positive results? I usually...
Alana8aSC
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™