Start Date: Feb 01, 2009
End Date: Dec 31, 2013
Hessian fly will be reared in the greenhouse at the USDA, ARS, Parlier and Manhattan. Basic fumigation tests will be conducted in the facilities provided by the ARS in Parlier and the National Hay Association in California, Oregon, and Washington. Laboratory dose-response fumigation tests will determine the effect of temperature, exposure time, and PH3 or PH3+CO2 dosage on Hessian fly mortality, and establish a treatment schedule. Large-scale fumigation tests at hay handling facilities will confirm the efficacy of a proposed PH3 or PH3+CO2 fumigation schedule as a quarantine treatment. Bale compression tests at hay handling facilities will be used to determine the effect of compressors on mortality of Hessian fly puparia. Large-scale compression tests will be used to confirm the efficacy of bale compression alone or in combination with fumigation as a quarantine treatment. Basic tests will determine the effect of postharvest drying and bale curing on Hessian fly mortality. Data will be provided to The National Hay Association in support of market access for hay exports from the western U.S.