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Wondering if you could confirm what kind of grub this is? Guessing Japanese beetle or June bug ... See moreSee less

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Is this a great golden digger wasp? or something else? There are two in the same area as sweat bees...sharing space? ... See moreSee less

UW-Madison Department of EntomologyYes--looks like the golden digger wasp (Sphex ichneumoneus). Many tunneling insects prefer sandier soils, (easier to tunnel into). This is likely why this wasp and the ground-nesting sweat bees are sharing the same general area.

2 weeks ago

Deb Pottscause for alarm? It's at work next to a back thoughts are just to leave them "bee" but do you think it could be an issue? Not a high traffic area.

2 weeks ago

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Christelle Guédot
Assistant Professor and Extension Specialist
(608) 262-0899
(608) 262-3322

546 Russell Laboratories
1630 Linden Drive
Madison, WI 53706

Ph.D. Biology - Utah State University, Logan, UT. 2004
Ability to conduct scientific research. Ecole Pratique des Hautes Etudes, Paris, France. 1998
Maîtrise. Neurobiology - Université Paul Sabatier, Toulouse, France. 1997 
B.S.  Cell Biology and Physiology - Universitédes Sciences, Montpellier, France. 1996

My major research interest is the study of natural chemicals that mediate interactions between organisms and how these chemical messages affect insect behaviors, with the ultimate goal to develop practical applications for semiochemicals for integration into pest management programs while sustaining and enhancing pollination services.

I joined the Department of Entomology at the University of Wisconsin in October 2012 as the Fruit Crop Entomologist and Extension Specialist. My research program focuses on 1) developing and refining effective, economical, and environmentally sound insect pest management (IPM) strategies; 2) determining the importance of pollinators and developing strategies for conserving and enhancing pollination services for fruit crops in Wisconsin.  The focus of my extension program is to provide up to date, research-based information to Wisconsin fruit growers on effective and sustainable IPM practices and on pollination services.


Professional Societies:
Entomological Society of America
International Society of Chemical Ecology
Kansas Entomological Society
Florida Entomologist

Horton D.R., Guédot C., and Landolt P.J. 2012. Identification of feeding stimulants for Pacific Coast wireworm by use of a filter paper assay (Coleoptera: Elateridae). Journal of the Entomological Society of British Columbia (In Press)

Guédot C., Horton D.R., and Landolt P.J.  2012.  Age at reproductive maturity and effect of age and time of day on sex attraction in the potato psyllid Bactericera cockerelliInsect Science 19:585-594

Pitts-Singer T.L., Buckner J.S., Freeman T.P., Guédot C.  2012.  Structural examination of the Dufour’s gland of the cavity-nesting bees Osmia lignaria Say and Megachile rotundata (Fabricius) (Hymenoptera: Megachilidae).  Annales of the Entomological Society of America 105:103-110

Landolt, P.J., Brumley J.A., Guédot C., Wanner K., Morales A.  2011. Male Fishia yosemitae (Grote) (Lepidoptera: Noctuidae) captured in traps baited with Z-7-dodecenyl acetate and Z-9-tetradecenyl acetate. Journal of Kansas Entomological Society 84:184-189

Landolt P.J., Guédot C., Hansen J., Wright L., and James D. 2011. Trapping hop looper moths, Hypena humuli Harris, (Lepidoptera: Erebidae) in hop yards with acetic acid and 3-methyl-1-butanol.  International Journal of Pest Management 57: 183-188

Garczynski S.F., Unruh T.R., Guédot C., and Neven L.G. 2011. Characterization of three transcripts encoding small heat shock proteins expressed in the codling moth, Cydia pomonella (Lepidoptera: Tortricidae).  Insect Science 18: 473-483

Guédot C., Horton D.R., and Landolt P.J.  2011.  Response of summerform pear psylla (Hemiptera: Psyllidae) to male- and female-produced odors. Canadian Entomologist 143: 245-253

Landolt P.J., Guédot C., and Zack R.S. 2011.  Spotted cutworm, Xestia c-nigrum L. (Lepidoptera: Noctuidae) responses to sex pheromone and blacklight. The Journal of Applied Entomology 135: 593-600

Guédot C., Horton D.R., and Landolt P.J.  2010.  Sex attraction in the potato psyllid Bactericera cockerelli (Hemiptera: Triozidae). Environmental Entomology 39: 1302-1308

Landolt P.J., Lowery D.T., Wright L.C, Smithhisler C., Guédot C., and James D.G. 2010.  Trap response of Abagrotis orbis (Grote) cutworm moths (Lepidoptera: Noctuidae) to a sex attractant lure in grape vineyards. The Canadian Entomologist 142: 135-142

Guédot C., Millar J.G., Horton D.R., and P.J. Landolt. 2009.  Identification of a sex attractant pheromone for male winterform pear psylla,Cacopsylla pyricola. The Journal of Chemical Ecology 35: 1437-1447

Buckner J.S., Pitts-Singer T.L., Guédot C., Hagen M.M., Fatland C.L. and Kemp W.P.  2009. Cuticular Lipids of Female Solitary Bees, Osmia lignaria Sayand Megachile rotundata (F.) (Hymenoptera:  Megachilidae).  Comparative Biochemistry and Physiology Part B 153: 200-205

Guédot C., Horton D.R., and P.J. Landolt.  2009. Attraction of male winterform pear psylla to female-produced volatiles and to female cuticular extracts with evidence of male-male repellency.  Entomologia Experimentalis et applicata 130: 191-197

Guédot C., Bosch J., and Kemp W.P. 2009. Relationship between body size and homing ability in the genus Osmia(Hymenoptera; Megachilidae). Ecological Entomology 34(1): 158-161

Guédot C., Landolt P. J., and Smithhisler C. 2008. Principal odorants of the flowers of Butterfly Bush, Buddleia davidiiFranch., as possible moth attractants. Florida Entomologist 91(4): 576-582   

Horton D.R., Guédot C., and P.J. Landolt. 2008. Attraction of male summerform pear psylla to volatiles from female pear psylla: effects of female age, mating status, and presence of host plant. The Canadian Entomologist 140:184-191

Landolt P. J. and Guédot C. 2008. Field attraction of codling moths (Lepidoptera: Tortricidae) to apple and pear fruit, and quantitation of kairomones from attractive fruit. Annals of the Entomological Society of America 101(3): 675-681

Horton D.R., Guédot C., and P.J. Landolt. 2007.  Diapause status of females affects attraction of male pear psylla, Cacopsylla pyricola, to volatiles from female-infested pear shoots. Entomologia Experimentalis et applicata 123: 185-192

Guédot C., Bosch J., and Kemp W.P. 2007.  Effect of three dimension and color patterns on nest location performance of two solitary bees(Hymenoptera: Megachilidae). Journal of the Kansas Entomological Society80(2): 90-104

Guédot C., Bosch J., James R.R., and Kemp W. P. 2006.  Effect of three dimension and color patterns on nest location and progeny mortality of Megachile rotundata (F.) (Hymenoptera: Megachilidae) in commercial alfalfa pollination. Journal of Economic Entomology 99(3): 626-633

Guédot C., Pitts-Singer T.L., Buckner J.S., Bosch J., and Kemp W.P. 2006.  Olfactory cues and nest recognition in the solitary bee Osmia lignaria Say (Hymenoptera: Megachilidae). Physiological Entomology 31: 110-119

Guédot C., Bosch J., and Kemp W.P. 2005.  The relative importance of vertical and horizontal visual cues in nest location by Megachile rotundata (F.) (Hymenoptera: Megachilidae). Journal of Apicultural Research44(3): 109-115


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