https://www.chemie-schule.de/KnowHow/Coumaphos
Coumaphos – chemie-schule.de
coumaphoschemieschule
https://www.ibeekeeper.de/en/lexikon/coumaphos/
Coumaphos – explained - iBeekeeper
Coumaphos is an organophosphate and was commonly used in Varroa control for many years, in Germany mainly in the form of a trickle treatment.
coumaphosexplained