U.S. Department of Agriculture: Animal and Plant Health Inspection Service


Date of this Version

April 1998


Published in Bull. Environ. Contam. Toxicol. (1998) 60:877-884.


Zinc phosphide (ZN3P2) is an acute rodenticide. One of its current uses employs application as a grain bait or pellet at the time of planting to reduce agricultural losses by field rodents. To mitigate rodent induced losses to corn, we hoped to expand the approved uses of zinc phosphide to include corn applications. After determining acceptable efficacy, we conducted a study to determine if potentially hazardous zinc phosphide residues in corn would result from this use. A field study was conducted in 5 corn growing states to provide samples for residue analysis of corn treated with zinc phosphide.