Ask a Question forum: Dianthus (perennial) question - white spots on leaves

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Name: Jackie
Lake Lanier, GA (Heat Zone 7) (Zone 7b)
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GenXNEGeorgia
Jul 25, 2017 9:37 AM CST
Hi everybody!

I checked the information superhighway but it just leads me here to ask you, the experts!

I noticed that when I first planted the Dianthus 'Pop Star,' pill bugs were all over it. I applied systemic pesticide and things have been better. Today, I noticed a small slug on one of the leaves; after I led him to the door, I noticed there was spotting on the plant. It has been raining a lot but there aren't any spots like this on my other plants.

Thumb of 2017-07-25/GenXNEGeorgia/e37c32

Also, should I apply horticultural soap for the slugs? I keep the mulch away from the base of the plant, like the planting instructions indicated.

I also noticed what looks like a possible bud that "died".....I don't know if this is a sign of something else.

Thumb of 2017-07-25/GenXNEGeorgia/88b2cb

A garden is a grand teacher. It teaches patience and careful watchfulness; it teaches industry and thrift; above all it teaches entire trust. — Gertrude Jekyll
Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jul 25, 2017 3:03 PM CST
Your little slug has probably had Dianthus for dinner every night. Its amazing how much they can eat. Horticultural soap works by penetrating the shell of insects so causing structural collapse and the bugs dry up. Snails and slugs are not insects so the soap won't work on them. If you see a snail or slug, pick it up and dispose of it.

Put pet safe bait out away from the plant in a place that gets sunshine. The bait works because the snails are too lethargic to get back into the shade before the sun comes out. The sun does the rest.

As the damage is on old leaves, not new leaves, I wouldn't worry about it.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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Name: Jackie
Lake Lanier, GA (Heat Zone 7) (Zone 7b)
☺ I love flowers!! ☺
Daylilies Dahlias Hibiscus Lilies Garden Photography
Image
GenXNEGeorgia
Jul 25, 2017 3:06 PM CST
Thank You! for your response!

Do the slugs eat the roots or the leaves? I flicked off the slug -- I need to do something else <yikes> because it'll just wander back to the plant Blinking

I didn't know Dianthus had slug issues -- I'm aware that some hostas can but...is this common?
A garden is a grand teacher. It teaches patience and careful watchfulness; it teaches industry and thrift; above all it teaches entire trust. — Gertrude Jekyll
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Jul 25, 2017 3:16 PM CST
The slugs are eating the leaves. Any plant that enjoys a damp rooting systems will be home to slugs. They like the same conditions: cool and damp.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jul 25, 2017 4:09 PM CST
The spots on the leaves look like something done by a piercing-sucking insect rather than a chewing pest like a slug. Slugs eat parts of the leaves, is that happening too? For the spots I would be looking for something like a leafhopper, which doesn't chew holes but feeds on the sap.

Edited to correct typo
[Last edited by sooby - Jul 25, 2017 4:10 PM (+)]
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Name: Jackie
Lake Lanier, GA (Heat Zone 7) (Zone 7b)
☺ I love flowers!! ☺
Daylilies Dahlias Hibiscus Lilies Garden Photography
Image
GenXNEGeorgia
Jul 25, 2017 9:30 PM CST
Thank You! both. Would a systemic pesticide take care of the issues?
A garden is a grand teacher. It teaches patience and careful watchfulness; it teaches industry and thrift; above all it teaches entire trust. — Gertrude Jekyll
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 26, 2017 2:58 AM CST
It would be better to verify what pest it was and whether it is still doing the damage. If you disturb the plant does anything fly/jump out?

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