Organotin compounds can be very toxic. "Tri-n-alkyltins" are phytotoxic and, depending on the organic groups, can be powerful bactericides and fungicides. Other triorganotins are used as miticides and acaricides. Tributyltin (TBT) was extensively used in marine antifouling paints, until discontinued for leisure craft due to concerns over longer-term marine toxicity in high-traffic areas such as marinas with large numbers of static boats.
