Oh gosh, I sure hope not. I know a bunch of those eggs were laid in my stocktank pond, and I'm using the dunks in there. :(

Wow, what a great question!
I don't think it is. I looked it up: mosquito dunks are made of BT Israelensis (sp?) which produces chemicals that only kill a small spectrum of insects. It doesn't kill much. Here's an epa link:

Here is a link that might be useful: BTI facts epa

Good question!

The active ingredient in Mosquito dunks is BT (bacillus thuringiensis).

The Google of "bacillus thuringiensis dragonfly" brought up several results that seemed to imply a probable "no" to that question...
Here's one:

Here is a link that might be useful: effect of repeated application of BT on dragonfly...

We have a lot of dead Dragonfly nymphs, but there are 3 distinct species in the bog and they may be preying on each other?

The way the bacillus works is by destroying thr gut lining of many nymph species of insects (not just mosquitos and black flies), and the study linked mentions smaller Dragonfly nymph size. I wish they did a much larger study because just one genus/species test leaves me a bit nervous still.
lsst - what kind (or colored) Dragonflies do you have?

jpinard,
I am in SC and I have seen the Neon blue ones, brownish orange ones and some really cool huge ones that remind me of helicopters because of the way they hover. We also have some Damsel flies

Someone a couple of years ago did a link to a cool dragonfly site that listed what dragonflies are in what regions of the world. Does anyone remember that link?

Cool! I hope someone has that link. That would be super helpful. We have a lot of Nymphs that are black and yellow striped just like a wasp.

Below is a great site for Odonata of the U.S.!

Brenda

Here is a link that might be useful: Dragons & Damsels of the U.S.

Excellent. Thanks!

YES...mosquito dunks kill dragonflies...I have sadly seen it

I've been using them for twenty years and have tons of dragonflies and damselflies breeding in my ponds.