I started a new game and added Wood Harvester, Alien Biomes, and Toxic Trees to my mods; I also have Bio Industries installed. In Toxic Trees, I have set tree density to 0.025 -- trees almost everywhere, so they still are a nuisance, but they're not planted so dense that I can't see myself anymore.

Now I place a wood harvester. As soon as I connect it to electric power, it doesn't start harvesting, but just explodes! There are no biters nearby, so the harvester is definitely not destroyed by an attack, but by receiving electric power. I assume that it might be a crazy interaction between mods. If you want to, I can provide a saved game.

Interesting! I'll look into it.

Oops, this seems to be a rather serious bug that has nothing to do with Alien Biomes or Toxic Trees. I've uploaded a quick fix that stops it from exploding for now.

A bit of a hack, I just hardcoded the names of valid trees for now, I'll make a proper fix later this weekend.

Great! Just loaded the savegame, placed a harvester, and it started to remove trees. Thanks a lot for the fix!