Pests and Diseases forum: Perennial Geranium Disease??

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Name: Jen Dionne
Southern NH (Zone 5b)
Heucheras Echinacea Plant and/or Seed Trader Vegetable Grower Enjoys or suffers cold winters I was one of the first 300 contributors to the plant database!
Keeper of Poultry Birds
NHJenDion
Jun 25, 2017 9:47 AM CST
I've grown a variety of perennial geranium which I believe is NH Purple for YEARS....I have never known it to be anything but low maintenance. I just happened to be walking by an section of it that edges one of my beds and noticed it looked bad. I've attached some photos and I'm wondering if anyone can give me some insight on what disease might be the culprit. The 3rd photo is for comparison to the second - as the 3rd one is unaffected and dense as it should be....

Thanks so much!

Thumb of 2017-06-25/NHJenDion/fd461b


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He who can laugh at himself will never cease to be amused....
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Jun 25, 2017 9:53 AM CST
I would check first for four-lined plant bugs, note the young ones (nymphs) look different from the yellow and black striped adults:

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Name: Rj
Just S of the twin cities of M (Zone 4b)
Garden Ideas: Level 1 Plant Identifier Million Pollinator Garden Challenge
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crawgarden
Jun 25, 2017 3:03 PM CST
Think it may be anthracnose, water early and avoid getting the leaves wet, clean out affected leaves. Maybe a wet cool spring?
Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed.
Name: Jen Dionne
Southern NH (Zone 5b)
Heucheras Echinacea Plant and/or Seed Trader Vegetable Grower Enjoys or suffers cold winters I was one of the first 300 contributors to the plant database!
Keeper of Poultry Birds
NHJenDion
Jun 26, 2017 11:42 AM CST
Thank you both! It has been a cooler spring with more rain than usual, and overcast days. It could be either of those things. I will check for the bugs, though when I looked at them the day I noticed the problem, I didn't see anything except some young grasshoppers. I do know THEY can spread disease, so I wasn't sure if that was part of it. I'll look for the bugs, then see what I can do about the irrigation.

Thanks again!

J
He who can laugh at himself will never cease to be amused....
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Jun 26, 2017 12:09 PM CST
I took some pictures this morning of four-lined plant bug damage to a hardy geranium so you could compare. I couldn't find the bugs, they have probably completed their lifecycle but they do this to these geraniums (and certain other plants) every year here. They feed by puncturing the leaf tissue hence the spots.

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Name: Jen Dionne
Southern NH (Zone 5b)
Heucheras Echinacea Plant and/or Seed Trader Vegetable Grower Enjoys or suffers cold winters I was one of the first 300 contributors to the plant database!
Keeper of Poultry Birds
NHJenDion
Jul 8, 2017 5:09 AM CST
Sooby,

You were right. I see no signs of the adults, but several other plants in the general area show damage that is quite obviously not disease, but in fact these little suckers (literally!). I will be more vigilant next spring when they are more active so I can prevent the damage.

Thanks again!

Jennifer
He who can laugh at himself will never cease to be amused....
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Jul 8, 2017 5:49 AM CST
I tip my hat to you. They're a real pain here on catmint, Russian sage, veronica, hardy geraniums, and a few other things. Obedient plant too if I remember rightly. They're also, fortunately, predictable, they go for certain plants every year so it is possible to get ahead of the damage by watching for the first signs. On the bright side at least they don't have continuous generations all season like some other bugs.

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