Light Splotches on Calendula Leaves?

aubadeJuly 19, 2009

I've noticed a lot of light greenish-yellow splotches on my calendula leaves. You can kind of see it in the picture below from a few weeks ago, and now it seems to be worse. Does anyone know if this is normal, and if not, what could be causing it?

Here is a link that might be useful: grow peace and dance in the garden

Thank you for reporting this comment. Undo
aubade

Oh darnit. Maybe it is leaf spot or smut. :-(
http://vvv.state.ct.us/caes/PlantPestHandbookFiles/pphC/pphcale.htm

    Bookmark   July 19, 2009 at 3:48PM
Thank you for reporting this comment. Undo
barbe_wa

It looks like it could be powdery mildew, but the variety that I'm growing this year appears to be naturally variagated.

    Bookmark   July 20, 2009 at 2:27AM
Thank you for reporting this comment. Undo
francescod(6b/7a VA)

It doesn't look like mildew to me. It looks more like insect damage.

barbe_wa-I would love to see pictures of a variegated calendula. I've never heard of one. Do you know the name?

F. DeBaggio

    Bookmark   July 20, 2009 at 12:14PM
Thank you for reporting this comment. Undo
aubade

They did have a TON of black aphids on them, could that have caused insect damage?

As soon as I noticed them I cut off all the spent blooms, where most of them were. Then I sprayed the rest off with a hose. It seems to have worked- that was last Wed. and this weekend I only saw a few remaining and sprayed those off too.

    Bookmark   July 20, 2009 at 12:54PM
Thank you for reporting this comment. Undo
francescod(6b/7a VA)

Not likely to be damage from aphids, although some of it could be if they were feeding on the leaves. The serpentine damage looks like that of leaf miners. They leave trails like that as the nymph matures and burrows out of the leaf. Preventing the adults from laying their eggs by covering the plants early in the season is the only way to prevent the adult from laying eggs. Once the eggs are laid inside the leaf, there isn't much that can be done.
Other possible culprits for any other type of damage are: Leaf hoppers and thrips. It could also be damage from a type of true bug like the tarnished plant bug.

As long as the damage doesn't get too severe, your plants will likely survive.

F. DeBaggio

Here is a link that might be useful: Picture of Tarnished Plant Bug

    Bookmark   July 20, 2009 at 2:39PM
Thank you for reporting this comment. Undo
aubade

Thanks. Leaf miners hmm. I think one of my chard plants did have leaf miner damage - is that the same bug that would attack both types of plants?

I cut the damaged leaves off the chard and it seems fine now, and none of my other chard plants were affected. But maybe they attacked the calendula instead!

This is only my 2nd year gardening so I've still got lots to learn.

    Bookmark   July 20, 2009 at 11:37PM
Thank you for reporting this comment. Undo
francescod(6b/7a VA)

Leaf miners will lay their eggs in the leaves of many different plants, including chard.

F. DeBaggio

    Bookmark   July 21, 2009 at 2:08PM
Thank you for reporting this comment. Undo
barbe_wa

F. DeBaggio - the variety I have that has spotted leaves is Zeolights. The spots are more yellow and smaller than what aubabe shows in the picture. I don't know if it is a characteristic of the variety or not, but the ones I grew last year had the same spots.

    Bookmark   July 27, 2009 at 2:29AM
Thank you for reporting this comment. Undo
francescod(6b/7a VA)

barbe_wa,
I looked up 'Zeolights' on several sites. No clear pictures of the foliage on any. No mention of it being variegated either. Any possibility of posting a picture of yours?

F. DeBaggio

    Bookmark   July 27, 2009 at 4:16PM
Thank you for reporting this comment. Undo
barbe_wa

I'm sorry but I've never mastered the art of adding photos, and I'm beginning to think I'm too old to learn. LOL. My grandson is visiting for a few days so if I can talk him into it, maybe he can help me out.

    Bookmark   July 27, 2009 at 7:22PM
Thank you for reporting this comment. Undo
barbe_wa

This is a picture of the Zeolight leaves. and flower.

    Bookmark   July 28, 2009 at 12:40AM
Thank you for reporting this comment. Undo
francescod(6b/7a VA)

barbe_wa-I'm afraid that is not variegation. It looks like a disease. Possibly leaf smut.

F. DeBaggio

    Bookmark   July 28, 2009 at 1:06AM
Thank you for reporting this comment. Undo
barbe_wa

It could be a disease, but like I said it was there on last year's plants, too, and doesn't seem to affect the flowering at all. The other varieties of calendula I've grown haven't had the same coloring.

    Bookmark   July 28, 2009 at 1:32AM
Thank you for reporting this comment. Undo
aubade

I think mine may have had the same type of spots they have now last year too. Barbe yours are definitely more round and smaller than mine are though. I have to take another pic because it is actually much worse now. :-( I'm so bummed. Was going to use the flowers to make bath salts for Christmas like I did last year, now everyone is going to be dissapointed.

    Bookmark   July 31, 2009 at 6:56PM
Thank you for reporting this comment. Undo
aubade

Well here's the latest pictures of my sad calendula plants.
At least yesterday I went to Bartram's Gardens in PA, which are the oldest botanical gardens in the country and noticed their calendula looked just like mine. At least I don't feel like such a terrible gardener now, if they can't even stop it! lol

    Bookmark   August 17, 2009 at 5:06PM
Sign Up to comment
More Discussions
Basil has me stumped
Hi - any idea what is attacking my basil? It is in...
martini100_gw
Mold on Dirt
Couple of questions. I am using the Burpee Greenhouses...
jaltman
How many seeds do I plant in a seed starter kit cell?
I'm sure this is one of those questions that almost...
drayven
Why is my basil wilted?
My roommate picked up this basil from the grocery store....
endi92
Cuttings from thyme
I wonder, I live in Zone 6 and my thyme plant has made...
Steve349
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™