30+% of the reviews on Amazon said they didn't work. Plenty of gnats and a few house flies but few, if any, mosquitoes were in the trap.
They said you can put sugar, salt, yeast and borate in a bottle with water and it does the same thing under tested conditions ... NOTHING.
"March 16, 2019
This product is a scam.
The “active” ingredients are salt and sugar.
You know, Malaria is a global problem. Don’t you think that if salt (aka sodium chloride) and sugar (aka sucrose) could actually reduce or eradicate mosquitoes, this product would win the inventor the Nobel Prize?
The trap will collect some flies and bugs attracted to the sugar, but no mosquitoes.
Also, if you write a “bad” review, the sellers contact you and tell you that you aren’t “installing” it correctly. You see, you have to put just the right number of traps in just the right locations in your yard. Yeah, right."