I don't think so, it's a stomach poison and since they'll track through it and don't groom would not be likely to ingest it also would take too much to do the job due to size disparity between a gecko and an insect. (toxicity is based on body weight of target)
Don't spray it on your grass only on the tree. Don't spray it in you r eye ethier.
Borax will kill fruit flies. Place some yogurt in the room with borax in it and it will kill off the flies.
Yes, borax does kill roaches. It interferes with their metabolism and kills them eventualy
Borax kills ants.
The areas they live in would defeat the borax
no
Yes if it is mixed with honey and/or peanut butter. It will kill them. Borax is poisonous if ingested.
yes
You can buy Boric Acid in Wal-Mart and similar stores. It is usually in the first aid section. Do not buy Borax, which is not the same thing and will not kill fleas.
Nothing. The acid in you stomach will immediately kill it. Cockroaches are considered eatable, certainly if you deep-fry them first.
squish them.
yes
It is the easiest to kill a cockroach in either the egg or nymph stages of the pest's life cycle.