[1] Penn State Univ, Dept Entomol, Chem Ecol Lab 4, University Pk, PA 16803 USA
[2] Penn State Univ, Dept Anim Sci, University Pk, PA USA
[3] Penn State Univ, Penn State Extens, Collegeville, PA USA
[4] Penn State Univ, Dept Vet & Biomed Sci, University Pk, PA USA
[5] ARS, Anim Dis Res Unit, USDA, Pullman, WA USA