Three almond field trials were conducted during 2003 and 2004 at two locations in central (Fresno County) and northern (Yolo County) California to evaluate the potential effects of commercial applications of Captan on honey bees, Apis mellifera L. Captan was applied at 5.0 kg (AI)/ha during bloom. Hives were evaluated for hive health and brood development parameters for approximately 2 mo after application. This study showed that the application of Captan was not harmful to foraging honey bees or their brood. No treatment-related effects were noted on hive weights, dead bee deformity, number of dead bees, survival of individual larvae, weight of individual emerging adults, and other hive health parameters.

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IRAC-US is a specialist technical group of CropLife America. It provides a coordinated crop protection industry response to prevent or delay the development of resistance in insect and mite pests. Its aim is to keep all classes of insecticides and acaricides as viable control options. The neonicotinoid subcommittee of IRAC, U.S. has developed resistance management guidelines for the use of the neonicotinoid class of chemistry. For additional information about IRAC, US visit the website: www.irac-online.org. Accepted for publication 6 July 2006. Published 19 July 2007.