College of Computer, Mathematical, and Natural Sciences

Pedro Barbosa


Emeritus Professor


Office Phone: 301-405-3946
Fax: 301-314-9290
Office Address: University of Maryland * Entomology Department * 4146 Plant Sciences
Building * University of Maryland * College Park, MD 20742

Current Status

Professor Emeritus

Graduate Program Affiliations

  • Entomology
  • BISI - BISI-Behavior, Ecology, Evolution, & Systematics (BEES) 

Current Interests

My interests are in theoretical and applied aspects of Insect Ecology, particularly interactions referred to as tri-trophic level interactions, as well as the biology and ecology of insect parasitoids. 

        Currently, I devote my time to writing books. Two recent books include Barbosa, P., Letourneau, D. K., and Agrawal, A. 2012. Insect Outbreaks Revisited. Wiley-Blackwell and Barbosa, P. and Berry, D. L. and Kary, C. K. 2014. Insect Histology. Practical Laboratory Techniques. (2nd Edition, Wiley Blackwell).

Recent Publications  

    Mallampalli, N., Gould, F. and Barbosa, P. 2005. Predation of Colorado potato beetle eggs by a polyphagous ladybeetle in the presence of alternate prey: potential impact on resistance evolution. Entomol. Exp. Appl. 114:47-55.
    Medina, R. F., Barbosa, P., and Waddell, K. 2005. Parasitism levels in Orgyia leucostigma (J. E. Smith) (Lepidoptera: Lymantriidae) feeding on two tree species: implications for the slow growth-high mortality hypothesis. Entomol. Exp. Appl. 115: 193-197.
    Stireman, III, J. O., Dyer, L. A., Janzen, D. H., Singer, M. S., Lill, J. T., Marquis, R. J., Ricklefs, R. E., Gentry, G. L., Hallwachs, W., Coley, P. D., Barone, J. A., Greeney, H. F. Connahs, H., Barbosa, P., Morais, H. C., and Diniz, I. R. 2005. Climatic unpredictability and parasitism of caterpillars: implications of global warming. Proc. Natl. Acad. Sci. 102: 17384-17387.  
    Barbosa, P., Caldas, A, and Riechert, S. 2005. Community structure of predators and their prey: potential             consequences to conservation biological control. In: The Ecology of redator-Prey Interactions. Barbosa, P.         and Castellanos, I. (eds.). pp. 344-369. Oxford University Press.
    Castellanos, I. and Barbosa, P. 2006. Evaluation of predation risk by a caterpillar using substrate-borne vibrations. Anim. Behav. 72:461-469.
    Gentry, G. L. and Barbosa, P. 2006. Effects of leaf epicuticular wax on the movement, foraging behavior, and attack efficacy of Diaeretiella rapae. Entomol. Exp. Appl. 121:115-122.
    Medina, R. F., Barbosa, P., Christman, M., and Battisti, A., 2006. Number of individuals and molecular markers to use in genetic differentiation studies. Mol. Ecol. Notes 6:1010-1013.
    Barbosa, P. and Caldas, A. 2007. Seasonal patterns of parasitism and differential susceptibility among species in macrolepidopteran assemblages on Salix nigra (Marsh) and Acer negundo L. Ecol. Entomol. 32:181-187.
    Barbosa, P. and Caldas, A. 2007. Do larvae of species in macrolepidopteran assemblages share traits that influence susceptibility to parasitism? Environ. Entomol. 36:329-336.
    Barbosa, P., Caldas, A. and Godfray, H. C. J. 2007. Comparative food web structure of larval macrolepidoptera and their parasitoids on two riparian tree species. Ecol. Res. 22:756-766.
    Medina, R. and Barbosa, P. 2008. The role of host-plant species in the phenotypic differentiation of sympatric populations of Aleiodes nolophanae Ashmead (Braconidae: Hymenoptera) and Cotesia marginiventris Cresson (Braconidae: Hymenoptera). Entomol. Exp. Appl. 128:14-26.
    Barbosa, P., Hines, J., Kaplan, I., Martinson, H., Szczepaniec, A. and Szendrei, Z. 2009. Associational resistance and associational susceptibility: having right or wrong neighbors. Annu. Rev Ecol. Evol. Syst. 40:1-20. (Invited Review).
    Moreno, C. R., Lewins, S. A. and Barbosa, P. 2010. Influence of relative abundance and taxonomic identity on the effectiveness of generalist predators as biological agents. Biological Control 52:96-103.
    Castellanos, I., Barbosa, P., Zuria, I., and Caldas, A. 2010. Does the mimetic posture of Macaria aemulataria (Walker) (Geometridae) larvae enhance survival against bird predation? J. Lepidopterists' Soc. 64:113-115.
    Lind, E. M. and Barbosa, P. 2010. Life history traits predict relative abundance in an assemblage of forest caterpillars. Ecology 91:3274-3283. Selected by the Faculty of 1000 (F1000) service (which identifies and evaluates the most important articles in biology and medical research publications).
    Lind, E. M. and Barbosa, P. 2010. High beta diversity between trees drives landscape-level homogeneity of a temperate forest caterpillar assemblage. Ecography (Submitted)
    Castellanos, I., Barbosa, P., Zuria, I., Tammaru, T. and Christman, M. 2011. Contact with caterpillar hairs triggers predator-specific defensive responses. Behavioral Ecology 22:1020-1025.
    Castellanos, I., Barbosa, P. and Caldas, A. 2011. Dropping from host plants in response to predators by a polyphagous caterpillar. J. Lep. Soc. 65(4): 270-272.
    Lind, E. and Barbosa, P. 2012. The Role of Ecological Stoichiometry in Outbreaks of Forest Lepidoptera. In: Insect Outbreaks. Oxford University Press. In Barbosa, P., Letourneau, D. K., and Agrawal, A. 2012. Insect Outbreaks Revisited. Wiley-Blackwell.
    Paustian, M. E. and Barbosa, P. 2012. Overlap of food and microhabitat preferences among some native and nonnative slugs in Mid-Atlantic forests of eastern North America. J. Molluscan Studies 78: 92-99.
    Castellanos, I., Barbosa, P., Zuria I., and Caldas A. 2013. Relationship between morphology and antipredator behavior in larvae of Orgyia leucostigma (Lepidoptera: Lymantriidae). Journal of Insect Behavior 
    Guthrie, J. T., Wigfield, A. W. Humenick, N. M., Perencevich, K., Taboada, A. and Barbosa, P. 2006. Influences of stimulating tasks on reading motivation and comprehension. J. Educ. Res. 99:232-245.

    Wigfield, A., Guthrie, J. T., Perencevich, K. C., Taboada, A., Klauda, S. L., McRae, A. and Barbosa, P. 2008. The        Role of Reading Engagement in Mediating the Effects of Instruction on Reading Outcomes. Psychology in the    Schools 45:432-445.

    Guthrie, J. T., McRae, A., Coddington, C. S., Klauda, S. L., Wigfield, A., Barbosa, P. 2009. Impacts of        Comprehensive Reading Instruction on Diverse Outcomes of Low-Achieving and High-Achieving Readers. J.    Learning Disabilities. 42:195-214.


  • Research Award, University of Maryland, Collegeof Chemical & Life Sciences, 2007
  • Honorary Member, Entomological Society of America.(2006)
  • Selected, Fellow of the Entomological Society of America (1997)
  • Fellow, American Association for the Advancement of Science, Elected (1991)
  • Distinguished Research Faculty Fellowship, University of Maryland (1991)
  • President (1987), Entomological Society of America, Eastern Branch
  • President (1987-1989), Association for Puerto Ricans in Science and Engineering
  • Bussart Memorial Award for Excellence in Research. Entomological Society of America; Eastern Branch (1986 and 1987)
  • Ford Foundation Fellow; National Research Council Fellowship (1984)
  • Visiting Professor: Zhejiang Agricultural University (1984-1987)
  • Professor Ad Honorium (Adjunct Professor), University of Puerto Rico (Mayaquez Campus, 1984)


  • B.S. 1966, City College of New York, Biology
  • M.S. 1969, Univ. of Massachusetts, Entomology
  • Ph.D. 1971, Univ. of Massachusetts, Entomology