1-MCP at 300 nL L−1 reduced stem end gray mold, bull’seye rot, and Phacidiopycnis rot. Stem end gray mold also was reduced by 1-MCP at 100 nL L−1 and reduction at rates from 10 to 100 nL L−1 was significant in one of two trials. Snow-mold rot was reduced by 30 nL L−1. Snow-mold rot (Snowdon, 1990) also known as Coprinus rot is an important disease of d’Anjou pears in the Pacific Northwest (Spotts et al., 1981) and British Columbia (Gaudet and Sholberg, 1990). Previously, only one study of the effects of 1-MCP on pear included data on decay and reported a reduction of decay (pathogens not specified) with 100 and 1000 nL L−1 but not 10 nL L−1 (Argenta et al., 2003).