Heucheras forum: Heuchera Pests and Diseases

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Name: Carolyn Madden
Pennsylvania
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Carolyn22
Feb 13, 2010 3:08 PM CST
Here is the Heuchera Pests and Diseases thread.
[Last edited by dave - Jul 10, 2011 9:17 PM (+)]
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Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Charter ATP Member I was one of the first 300 contributors to the plant database!
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stormyla
Feb 14, 2010 10:40 AM CST
Some of the chartreuse colored Heuchs seem to get a lot of brown spotty fungus in the wet springs. I find that a couple of sprayings with a fungicide will clear it up.
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
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Carolyn22
Feb 14, 2010 2:23 PM CST
Stormy -

I have seen little brown patches on some of my chartreuse heucheras. I did not realize it was a fungus. I thought it was from the sun. I will have to go after them with fungicide now if I see them. It does seem to be just the chartreus ones...
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Charter ATP Member I was one of the first 300 contributors to the plant database!
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stormyla
Feb 14, 2010 2:44 PM CST
Carolyn, Except for the dreaded Black Vine Weevil, I think that Heuchs are relatively pest free. Thank heavens the slugs and earwigs seem to avoid them.
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
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Carolyn22
Feb 14, 2010 3:00 PM CST
It was a thought, but perhaps we can still have some pictures for reference. If not, then I suppose I can delete the thread..
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Charter ATP Member I was one of the first 300 contributors to the plant database!
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stormyla
Feb 14, 2010 3:05 PM CST
No, you can pull together links here about the Weevils. There are a number of good ones. I remember that the RHS had a great one.
Name: Cheryl Medina
Chicago area, IL
Charter ATP Member I was one of the first 300 contributors to the plant database!
medinac
Jun 26, 2010 10:26 AM CST
Carolyn and Stormy - Just wondering what the fungus looks like? Dry brown spots or wet looking ones - if that makes sense? I have some brown spots on mine now that have developed but they are dry looking ones. One's on Sparkling Burgundy that I pulled out of a different bed that I have in a single pot that's sitting waiting to be planted elsewhere. I thought it was odd but I put it in full sun as that seems to help it stay purple and thought it was sun burn.

Also, I talked about a problem with some of my others that I suspect may be fungal related on the "Post your Pictures". As soon as I find my camera that I misplaced after Father's Day, I'll post them. I guess it wouldn't hurt to give them a dose of fungicide anyway just in case.

As a side note, I bought "Mars" from a nursery last year up in Hayward, WI. It too is awaiting a home in the ground and one day I picked up the pot to move it and I found 2 weevils hanging onto each other (oh horrors, maybe they were mating????) along the top edge of the pot. I quickly smashed the little buggars. I think it'd be a good idea to throw out the soil and rinse it off good prior to planting. I though, "Oh just great just what I need, just when I think I've got THAT problem under control"!! Apparently that's how we get these pests!
Name: Chris
Ripon, Wisconsin
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Sages Forum moderator Garden Ideas: Master Level Plant Database Moderator
Seller of Garden Stuff I sent a postcard to Randy! Sempervivums Sedums Region: Wisconsin Hosted a Not-A-Raffle-Raffle
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goldfinch4
Jun 26, 2010 2:23 PM CST
Cheryl, I've never heard of problems like you're having with heurchs (that you posted on the other forum). I did look for information on heuchera diseases and here is some information I found:

"Plants that are too moist and shady may get some fungus problems during the summer. Moving them to a different site should solve this. The worst insect pest of the heuchera-tiarella group is the Black Vine Weevil, Otiorhynchus sulcatus. Larvae of this beetle bore in the roots and crowns of various plants, eventually causing the top of the plant to die. There is one generation of weevils per year, with the adults active in western Pennsylvania in June and the larvae causing most of their damage in the late summer and early fall. Inspecting wilted plants and killing the larvae is usually the only control needed in the garden. Introducing beneficial nematodes every couple of years is a good idea for control of weevils and other soil pests."

"Stem rot causes stem rotting and, under moist conditions, a white growth appears on infected parts. The disease is caused by Sclerotinia sclerotiorum and it may be controlled with drenches of Benomyl."

And here is an article on a variety of heuchera diseases: http://www.gardenguides.com/110454-heuchera-disease.html

If any of these sound like what is happening with yours, please let us know. I sure hope your able to diagnose and save them.

Bummer about your camera too. I stupidly dropped mine on the cement patio this morning and I can't believe I didn't wreck it. It's one tough little camera!
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Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Charter ATP Member I was one of the first 300 contributors to the plant database!
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stormyla
Jun 26, 2010 10:56 PM CST
Great info Chris. Thanks Thumbs up

Cheryl, Hilarious! will I ever get used to calling you that?? I only get the fungus in wet years. It is definitely a wet looking brown spotted fungus. Funny, in my shade bed , Pistache, Harvest Lemon Chiffon & Citronelle get it and also the Heartleaf Bergenia. They get it really bad. The ones planted in sun never get it. I just squirt some antifungal on them and it clears up. With last year's really wet spring, I had to do it a few times. Nothing died from it.

Cheryl, I remember how much trouble you had with those weevils. RCN always has problems with them too. Most of my Heuchs have come from East Coast suppliers and so far, I've not had the weevils. I've bought plants from RCN, and none of the ones she sent me came with "extras". They must be crawling around in her gardens, but not in her nursery stock. She is in Virginia, so it must be a nationwide problem.
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
Image
Carolyn22
Jun 27, 2010 6:34 PM CST
Cheryl,

I know just what you mean - I was referring to the dry brown patches. I find I have them on Pistache and Citronelle. Ironically, I do not have these patches on Dolce Key Lime Pie or any of the other bicolor lighter green heuchs.

I have attached a photo of Pistache that I took in the middle of this past May. You can see the brown spots on the left side of Pistache. I am hoping you find your camera so you can post some pictures for us.

Chris -Great info!

Thumb of 2010-06-28/Carolyn22/fce257
Name: Cheryl Medina
Chicago area, IL
Charter ATP Member I was one of the first 300 contributors to the plant database!
medinac
Jun 27, 2010 7:20 PM CST
Chris, Thanks for all the info, thanks so much! On Georgia Peach, it sounds like the wet fungus because some of the stems just curled from the top and rotted. Weird that the ones affected are 3 Georgia Peach. I just bought some "natural" fungicide they say is comparable to baking soda so I'll mix some up and use it and see what happens. Maybe it's fungal with the Mocha Mint and Peach Flambe. I took a look at them today and Mocha Mint's looking pretty bad. They're all in the same area so maybe it's just spreading. I'm sure all this continuous rain isn't helping.

Stormy - It IS different when we actually find out each other's real names huh? Now you know where medinac came from right? Yep, those weevils were bad but the nematodes really helped out with that and I wish NEVER to get them again. I was so careful to apply them at the right time and temperature to solve that problem. And I had the grub problem and grasshopper problem all at the same time!. I used both the nematodes and Milky Spore and that solved the problem for the most part. And NoLo bait for the grasshoppers. I did see a few of them suckers around recently. I didn't buy the nematodes or NoLo this year but looks like I'm going to have to next year just to be safe. I have some old NoLo but don't think it's going to be effective but will put some out anyway, why not right?

Carolyn - Thanks for posting your picture. That's EXACTLY what I get on my Citronelle and Pistache. Citronelle worse than Pistache. My Key Lime Pie is unaffected as well. So you think I should use the fungicide those too - I guess it can't hurt right? I thought it was strong sunburn early on because they get alot of Springtime sun. I think the spots on Sparkling Burgundy are burns, it looks totally different.

Gotta find that camera!!!!! Glad your camera was okay Chris, after dropping it....
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
Image
Carolyn22
Jun 27, 2010 8:14 PM CST
hmmm.... looks like I should start spraying mine as well....
Name: Chris
Ripon, Wisconsin
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Sages Forum moderator Garden Ideas: Master Level Plant Database Moderator
Seller of Garden Stuff I sent a postcard to Randy! Sempervivums Sedums Region: Wisconsin Hosted a Not-A-Raffle-Raffle
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goldfinch4
Jul 21, 2010 5:16 AM CST
Carolyn, were you able to get the fungus under control?
Cubits Store: The Sempervivum Patch - plants, containers, accessories!
Also stop by Timber Treasures and Garden Buddies on Cubits
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
Image
Carolyn22
Jul 21, 2010 8:05 AM CST
Chris

I noticed that the brown spots seem to be contained and not spreading without doing any spraying, so I have not sprayed, but am trying to keep an eye on it. This has not transferred to any of the other plants around it either.

Name: Chris
Ripon, Wisconsin
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Sages Forum moderator Garden Ideas: Master Level Plant Database Moderator
Seller of Garden Stuff I sent a postcard to Randy! Sempervivums Sedums Region: Wisconsin Hosted a Not-A-Raffle-Raffle
Image
goldfinch4
Jul 21, 2010 8:51 AM CST
Glad it hasn't spread. Have you been getting a lot of rain this year too? All this moisture is causing lots of fungal problems.
Cubits Store: The Sempervivum Patch - plants, containers, accessories!
Also stop by Timber Treasures and Garden Buddies on Cubits
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
Image
Carolyn22
Jul 21, 2010 12:23 PM CST
Chris

actually we have not. We have only recently started to get any type of rain. We have been having the other problems. It has been so dry here and when it rains, it rains hard so it really does not penetrate much beyond the surface of the soil.

A couple of days ago, I went out to water my deck boxes and containers and I noticed that my one shade bed had weepy heuchs and brunnera. I may even have lost the fern that I had planted in there - not positive about that one yet. I did give them all a good long drink with the hose and I was very glad to see the tiarellas, hechs and brunnera bounce back. Time will tell on the fern though.

Ironically last year, it rained every single day and this year, we have the complete opposite. ABC News said the other evening, that the second half of the summer is going to be hotter than the first half. They did not quote temps or anything, but said the worst is yet to come - We will see what Mother Nature throws our way.
Name: Chris
Ripon, Wisconsin
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Sages Forum moderator Garden Ideas: Master Level Plant Database Moderator
Seller of Garden Stuff I sent a postcard to Randy! Sempervivums Sedums Region: Wisconsin Hosted a Not-A-Raffle-Raffle
Image
goldfinch4
Jul 21, 2010 1:50 PM CST
Boy, sure wish I could send you some rain. We're the ones getting it every day this year. I grow sempervivums, which are drought tolerant plants, and they've been rotting in the ground. I'm so bummed about it.

They're also predicting hotter temps to come for us too. So now we have heat and humidity. YUK!
Cubits Store: The Sempervivum Patch - plants, containers, accessories!
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Name: Cheryl Medina
Chicago area, IL
Charter ATP Member I was one of the first 300 contributors to the plant database!
medinac
Jul 21, 2010 4:23 PM CST
Hi all -

Chris, did you have a nice vacation? We've had lots of heat and humidity. All the rain has been missing us, either going south or north of here. Hopefully tomorrow we are supposed to get a storm and I'm really looking forward to it!!
I'm getting tired of watering and my pool really needs water, I'd rather fill it with the free stuff than the kind I have to pay for! The plus side is the mosquito population is down, woo hoo!

I still think I'm having problems with fungus and am going to spray again. I'm sure the humidity isn't helping. I just noticed today I'm getting spots on the cucumber leaves and I never water them from overhead so it's got to be the humidity. I'd better get moving on that...
Name: Carolyn Madden
Pennsylvania
Charter ATP Member The WITWIT Badge I was one of the first 300 contributors to the plant database! Dog Lover Plant and/or Seed Trader Daylilies
Bulbs Purslane Lover of wildlife (Black bear badge) Hummingbirder Clematis Cat Lover
Image
Carolyn22
Jul 21, 2010 8:07 PM CST
Cheryl

I am getting sick of watering too. Have you ever noticed that your plants will wilt without the water and they don't grow as quickly, however the weeds never have any prolbems? They grow nice and tall and don't seem to wilt as quickly as the cultivated plants?

Chris - I can just imagine what the rain is doing to the sempervivums. Poor things.
Name: Chris
Ripon, Wisconsin
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Sages Forum moderator Garden Ideas: Master Level Plant Database Moderator
Seller of Garden Stuff I sent a postcard to Randy! Sempervivums Sedums Region: Wisconsin Hosted a Not-A-Raffle-Raffle
Image
goldfinch4
Jul 22, 2010 4:04 AM CST
Yes, had a great vacation! Only got rained on once.

I've only had to water my gardens once this year - early in the spring. So that part of all the rain is nice. Lots of my plants are enjoying it, just not the sempervivums. We have a corn field in back of our house and the plants are about 9 ft. tall! I've never seen them that big before. And yes, weeds seem to do good with any kind of weather. Glare
Cubits Store: The Sempervivum Patch - plants, containers, accessories!
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