Dahlias forum: Thrip damage?

Views: 1831, Replies: 2 » Jump to the end
Name: Erin
Pittsburgh, PA (Zone 5b)
Jul 8, 2018 7:37 AM CST

Thumb of 2018-07-08/ErinGerg/c9292f

My dahlias all have a bit of this. I seem to have a spider mite issue in one garden. Are we thinking thrip or spider mite? I have some spray on the way. What do you guys do to control infestations?

Name: Geof
NW Wisconsin (Zone 4b)
Region: Wisconsin Dahlias Garden Ideas: Level 1 Celebrating Gardening: 2015
Jul 8, 2018 9:50 AM CST
I have never had either thrips or spider mites (lucky I guess). So am not any real help here. I think insecticidal soap works on those guys.

I just get the chewing bugs, Earwigs, and Japanese Beetles. I have tried various things over the years, but nothing other than squishing them as I find them seems to help.
Name: Dan
NE Ohio (Zone 6a)
Jul 9, 2018 2:01 PM CST
I have one bed with 13 dahlias and over half have what I thought was powdery mildew. After looking closer, I'm now sure it's spider mites on the underside of the leaves. I've done some reading the past couple days and it seems there are no insecticides available to gardeners that will completely eliminate them. There are some stronger pesticides but sold "for commercial use only." It sounds like most gardeners just spray the mites and eggs off with a water hose. But I can't imagine that they don't return. I have replaced three plants already and plan to replace more or all when it cools down a little. I hate to transplant anything in the heat of July. I will spray Bayer's Insect and Mite Control as I plant and hope to stop it or at least keep it contained to this one bed. I can vaguely recall when gardening was fun. But I swear, there's a new problem(s) every year!

Erin, do your leaves look like this?
Thumb of 2018-07-09/psudan/b80132

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