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United States Department of Agriculture

Agricultural Research Service

Theresa Pitts Singer

Research Entomologist


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Progeny of Osmia lignaria from distinct regions differ in developmental phenology and survival under a common thermal regime - (Peer Reviewed Journal)
Pitts Singer, T., Cane, J.H., Trostle, G. 2014. Progeny of Osmia lignaria from distinct regions differ in developmental phenology and survival under a common thermal regime. Journal of Insect Physiology. 67:9-19.
Implications of season and management protocol on the landscape of gene regulation during diapause development in the Alfalfa Leaf Cutting Bee - (Abstract Only)
Yocum, G.D., Bennett, A.K., Rinehart, J.P., Kemp, W.P., Pitts Singer, T., Bowsher, J.H. 2014. Implications of season and management protocol on the landscape of gene regulation during diapause development in the Alfalfa Leaf Cutting Bee [abstract]. 8th Annual Arthropod Genomics Sympsium. 06/12-14/2014. University of Illinois at Urbana-Champaign. Paper No. 43.
Health status of alfalfa leafcutting bee larvae (Hymenoptera: Megachilidae) in commercial United States alfalfa seed fields - (Peer Reviewed Journal)
James, R.R., Pitts Singer, T. 2013. Health status of alfalfa leafcutting bee larvae (Hymenoptera: Megachilidae) in commercial United States alfalfa seed fields. Environmental Entomology. 42(6):1166-1173.
Nest marking behavior and chemical composition of olfactory cues involved in nest recognition in Megachile rotundata - (Peer Reviewed Journal)
Guedot, C.N., Buckner, J.S., Hagen, M.M., Bosch, J., Kemp, W.P., Pitts Singer, T. 2013. Nest marking behavior and chemical composition of olfactory cues involved in nest recognition in Megachile rotundata. Environmental Entomology. 42(4):779-789.
Variation in alfalfa leafcutting bee, Megachile rotundata, reproductive success according to location of nests in U.S. commercial domiciles - (Peer Reviewed Journal)
Pitts Singer, T. 2013. Variation in alfalfa leafcutting bee, Megachile rotundata, reproductive success according to location of nests in U.S. commercial domiciles. Journal of Economic Entomology. 106(2): 525-1074.
Intended release and actual retention of alfalfa leafcutting bees (hymenoptera: megachilidae) for pollination in commercial alfalfa seed fields. - (Peer Reviewed Journal)
Pitts Singer, T. 2013. Intended release and actual retention of alfalfa leafcutting bees (hymenoptera: megachilidae) for pollination in commercial alfalfa seed fields.. Journal of Economic Entomology. 106(2): 576-86.
Nesting site density and distribution affects Osmia lignaria (Hymenoptera: Megachilidae) reproductive success and almond yield in a commercial orchard. Reprint Icon - (Peer Reviewed Journal)
Artz, D.R., Allan, M.J., Wardell, G.I., Pitts Singer, T. 2013. Nesting site density and distribution affects Osmia lignaria (Hymenoptera: Megachilidae) reproductive success and almond yield in a commercial orchard.Insect Conservation and Diversity.doi:10.1111/icad.12026
Variation in alfalfa leafcutting bee (hymenoptera: megachilidae) reproductive success according to location of nests in United States commercial domiciles. - (Peer Reviewed Journal)
Pitts Singer, T. 2013. Variation in alfalfa leafcutting bee (hymenoptera: megachilidae) reproductive success according to location of nests in United States commercial domiciles.. Journal of Economic Entomology. 106(2): 543-51.
The long summer: Pre-wintering temperatures affect metabolic expenditure and winter survival in a solitary bee - (Peer Reviewed Journal)
Sgolastra, F., Kemp, W.P., Buckner, J.S., Pitts Singer, T., Maini, S., Bosch, J. 2011. The long summer: Pre-wintering temperatures affect metabolic expenditure and winter survival in a solitary bee. Journal of Insect Physiology. 57(12):1651-1659.
Structural Examination of the Dufour's Gland of the Cavity-nesting Bees Osmia lignaria Say and Megachile rotundata (Fabricius) (Hymenoptera: Megachilidae) - (Peer Reviewed Journal)
Pitts Singer, T., Buckner, J.S., Freeman, T.P., Guedot, C.N. 2012. Structural examination of the Dufour's gland of the cavity-nesting bees Osmia lignaria say and Megachile rotundata (Fabricius) (Hymenoptera: Megachilidae). Annals of the Entomological Society of America. 105(1): 103-110.
Attraction to Old Nest Cues During Nest Selection by the Solitary Bee Megachile rotundata (Hymenoptera: Megachilidae) - (Peer Reviewed Journal)
Stanley, C., Pitts Singer, T. 2011. Attraction to Old Nest Cues During Nest Selection by the Solitary Bee Megachile rotundata (Hymenoptera: Megachilidae). Journal of Apicultural Research. 50(3)227-234.
Influence of rough handling on Osmia lignaria (Hymenoptera: Megachilidae) retention in commercial orchards - (Peer Reviewed Journal)
Stanley, C.A., Pitts Singer, T., Bosch, J. 2011. Influence of rough handling on Osmia lignaria (Hymenoptera: Megachilidae) retention in commercial orchards. Journal of Economic Entomology. 104:750-752.
Sexual Harassment by Males Reduces Female Fecundity in the Alfalfa Leafcutting Bee (Megachile rotundata) - (Peer Reviewed Journal)
Rossi, B.H., Nonacs, P., Pitts Singer, T. 2010. Sexual harassment by males reduces female fecundity in the alfalfa leafcutting bee (Megachile rotundata). Animal Behaviour. 79:165-171.
Effects of the insect growth regulator, novaluron on immature alfalfa leafcutting bees, Megachile rotundata - (Peer Reviewed Journal)
Hodgson, E.W., Pitts Singer, T., Barbour, J.D. 2011. Effects of the insect growth regulator, novaluron on immature alfalfa leafcutting bees, Megachile rotundata. Journal of Insect Science. 11:43.
The Alfalfa Leafcutting Bee, Megachile rotundata: The World's Most Intensively Managed Solitary Bee - (Peer Reviewed Journal)
Pitts Singer, T., Cane, J.H. 2011. The alfalfa leafcutting bee, Megachile rotundata: The world's most intensively managed solitary bee. Annual Review Of Entomology. 56:221-237.
Nest establishment, pollination efficiency, and reproductive success of Megachile rotundata (Hymenoptera: Megachilide) in relation to resource availability in field enclosures - (Peer Reviewed Journal)
Pitts Singer, T., Bosch, J. 2010. Nest establishment, pollination efficiency, and reproductive success of Megachile rotundata (Hymenoptera: Megachilide) in relation to resource availability in field enclosures. Environmental Entomology. 39: 149-158.
The proboscis extension reflex not elicited in Magachilid bees - (Peer Reviewed Journal)
Vorel, C.A., Pitts Singer, T. 2010. The proboscis extension reflex not elicited in Magachilid bees. Journal of Kansas Entomological Society. 83(1): 80-83.
Prewinter Management Affects Megachile rotundata (Hymenoptera: Megachilidae) Prepupal Physiology and Adult Emergence and Survival - (Peer Reviewed Journal)
Pitts Singer, T., James, R.R. 2009. Prewinter Management Affects Megachile rotundata (Hymenoptera: Megachilidae) Prepupal Physiology and Adult Emergence and Survival. Journal of Economic Entomology 102(4):1407-1416.
Cuticular Lipids of Female Solitary Bees, Osmia lignaria Say and Megachile rotundata (F.) (Hymenoptera: Megachilidae) Reprint Icon - (Peer Reviewed Journal)
Buckner, J.S., Pitts Singer, T., Guedot, C.N., Hagen, M.M., Fatland, C.L., Kemp, W.P. 2009. Cuticular Lipids of Female Solitary Bees, Osmia lignaria Say and Megachile rotundata (F.) (Hymenoptera: Megachilidae). Comparative Biochemistry and Physiology B. 153(2):200-205.
Do weather conditions correlate with findings in failed, provision-filled nest cells of Megachile rotundata (Hymenoptera:Megachilidae) in western North America? - (Peer Reviewed Journal)
Pitts Singer, T., James, R.R. 2008. Do weather conditions correlate with findings in failed, provision-filled nest cells of Megachile rotundata (Hymenoptera:Megachilidae) in western North America?. Journal of Economic Entomology. 101(3): 674-685
Field use of an incubation box for improved emergence timing of Osmia lignaria populations used for orchard pollination - (Peer Reviewed Journal)
Pitts Singer, T., Bosch, J., Kemp, W.P., Trostle, G.E. 2008. Field use of an incubation box for improved emergence timing of Osmia lignaria populations used for orchard pollination. Apidologie. 39: 235-246
Bees in Nature and on the Farm - (Book / Chapter)
Pitts Singer, T., James, R.R. 2008. Bees in Nature and on the Farm. Book Chapter. Bee Pollination in Agricultural Ecosystems. Oxford University Press
Past and Present Management of Alfalfa Bees - (Book / Chapter)
Pitts Singer, T. 2008. Past and Present Management of Alfalfa Bees. Book Chapter. Bee Pollination in Agricultural Ecosystems. Oxford University Press
Bee Pollination in Agricultural Eco-Systems - (Book / Chapter)
James, R.R., Pitts Singer, T. 2008. Bee Pollination in Agricultural Eco-Systems. Complete Book. Oxford University Press.
The Future of Agricultural Pollination - (Book / Chapter)
James, R.R., Pitts Singer, T. 2008. The Future of Agricultural Pollination. Book Chapter. Bee Pollination in Agricultural Ecosystems. Oxford University Press
Nest Demographics and Foraging Behavior of Apterostigma Collare Emery (Hymenoptera, Formicidae)provide Evidence of Colony Independence - (Peer Reviewed Journal)
Pitts Singer, T., Espelie, K.E. 2007. Nest demographics and foraging behavior of apterostigma collare emery (hymenoptera, formicidae)provide evidence of colony independence. Insectes Sociaux. 54: 310-318
Olfactory response of megachilid bees, Osmia lignaria, Megachile rotundata and M. pugnata,to individual cues from old nest cavities - (Peer Reviewed Journal)
Pitts Singer, T. 2007. Olfactory response of megachilid bees, Osmia lignaria, Megachile rotundata and M. pugnata, to individual cues from old nest cavities. Environmental Entomology. 36: 402-408
Olfactory Cues and Nest Recognition in the Solitary Bee Osmia Lignaria - (Peer Reviewed Journal)
Guedot, C., Pitts Singer, T.L., Buckner, J.S., Bosch, J., Kemp, W.P. 2006. Olfactory cues and nest recognition in the solitary bee Osmia lignaria. Physiological Entomology. 31:110-119.
Emergence Success and Sex Ratio of Commercial Alfalfa Leafcutting Bees, from the United States and Canada - (Peer Reviewed Journal)
Pitts Singer, T., James, R.R. 2005. Emergence success and sex ratio of commercial alfalfa leafcutting bees, from the United States and Canada. Journal of Economic Entomology. 98(6):1785-1790.
Ascosphaera Aggregata Contamination on Alfalfa Leafcutting Bees in a Loose Cell Incubation System - (Peer Reviewed Journal)
James, R.R., Pitts Singer, T. 2005. Ascosphaera aggregata contamination on alfalfa leafcutting bees in a loose cell incubation system. Journal of Invertebrate Pathology. 89:176-178.
Effects of Temperature and Relative Humidity on Alfalfa Leafcutting Bee Immature Survival - (Other) - (20-Jun-04)
A Review of the Sphaeropthalma Uro Species-Group (Hymenoptera: Mutillidae), with Taxonomic Changes - (Peer Reviewed Journal)
Pitts, J.P., Parker, F.D., Pitts Singer, T. 2004. A review of the sphaeropthalma uro species-group (hymenoptera: mutillidae), with taxonomic changes. Journal of Kansas Entomological Society.77(3):222-234.
Studies for Improving Health and Management of Alfalfa Leafcutting Bees in the Northwestern U.S. - (Proceedings) - (19-Jan-04)
2003 Alfalfa Leafcutting Bee Health Survey - (Abstract Only) - (19-Jan-04)
Examination of "pollen Balls" in the Nests of the Alfalfa Leafcutting Bee, Megachile Rotundata - (Peer Reviewed Journal)
Pitts Singer, T. 2004. Examination of "Pollen Balls" in the nests of the alfalfa leafcutting bee, Megachile rotundata. Journal of Apicultural Research. 43(2):40-46.
Attraction to Old Nest Contents in Two Megachilid Bees Used As Commercial Pollinators - (Abstract Only) - (25-Oct-03)
Leafcutting Bees Reprint Icon - (Book / Chapter)
Pitts Singer, T., James, R.R. 2007. Leafcutting bees. In: Shimanuki, H., Flottum, K., Harman, A., editors. ABC & XYZ of Bee Culture. 41st edition. Medina, OH: A.I. Root Company. p 492.
Last Modified: 4/17/2009