Diflubenzuron and BAY SIR 8514 in Mushrooms Grown in Treated Compost or Casing

Abstract

Chemical methodology based on liquid chromatography was developed to measure trace amounts of two insect chitin synthesis inhibitors in mushrooms that are effective for control of a sciarid fly, Lycoriella mali (Fitch). No residues (<0.05 ppm) of diflubenzuron were found in mushrooms grown in treated compost. Trace amounts of diflubenzuron and BAY SIR 8514 (2-chloro-N-[[[4-(trifluoromethoxy)phenyl]-amino]carbomyl]) were found in several samples of mushrooms grown in treated casing and were attributed to splash-up of the treated casing onto the mushroom during watering.