There are a few Biological means that I have just realized a week ago. I collect rainwater often, and in one of my tubs, I noticed that it got "infected" by a beetle one of these:
http://www.europeangardener.com/prin...ory=324&ID=663
I noticed that after all this time, maybe 1 month already of this water being there, I have never seen any bloodworms or mossie larvaes. So I guess that these beetles are eating them. Now the problem for those who doesn't have these in your water tray is how to get them and if they are available in your area (I am guessing they are in the wild).
Shawn, I have a feeling that any type of chemical or pill is a bit dangerous for our plants, unless specifically guaranteed to be safe for them. I imagine some type of petrolium will be involved.
Infurita, can you please explain a bit more about the bacteria pellets you mentioned. This is to control Mosquito larvae or to feed your Aldrovanda?
Shawn, I actually am using a similar system as Simon to some of my pots, specifically VFT pots, it was actually just an accident. my VFT pots has a wide brim but narrow bottom, and coz I needed at least 1" of water, most of my water trays were not effective, so I found some plastic bowls in a shopping center, it fit perfectly. The pots fit snugly on the bowl brim that I have never seen mosquitos at all, well aside from the fact that with the wide pot, the standing water evaporates easily and sometimes do dry out if I forget to water them for two days in hot days.
Will try to post photos, but very similar in concept anyway with Simon's.
I do imagine that your problem is that you'll have to make those water trays for your plants one by one, that is like a thousand plastic container. hehehe!
Your Cocomat system works fine too doesn't it?
Wait, I just did a quick search, try searching for Skeetercide or Skeetershield and see if you can find out if they are already in mass production. This is Yeast laced with some kind of hormone that starves the Larvaes, I do hope that the hormone doesn't affect plants though.
TTFN
Arvin