Tridemorph is a fungicide used to control Erysiphe graminis. It was developed by BASF in the 1960s who use the trade name Calixin. The World Health Organization has categorized it as a Class II "moderately hazardous" pesticide because it is believed harmful if swallowed and can cause irritation to skin and eyes.[1]
One theory for the cause of the Hollinwell incident is that it might have been caused by inhalation of tridemorph.[2]
References
^"Tridemorph". Pesticides News. June 1999. Retrieved 24 August 2012.