Caffeinated Mosquito Control
Used coffee grounds are effective at destroying the larvae of mosquitoes carrying dengue, yellow fever, West Nile virus, malaria and other diseases.
Biocontrol Beat reports on the promising research of Hermione Bicudo at Universidade Estadual Paulista in Sao Paulo, Brazil:
“Approximately four full soup spoons of used coffee grounds in a 250 mL glass of water killed [...]
Link