Contact Information

USDA-ARS
Southern Insect Management Research Unit
141 Experiment Station Road
P.O. Box 346
Stoneville, MS 38776
Ph: (662) 686-3660
Fax: (662) 686-5421

Work Experience

• 2011 to present , Southern Insect Management Research Unit, USDA, ARS, Stoneville, MS, Category II Research Entomologist
• 2010 to 2011, Southern Insect Management Research Unit, USDA, ARS, Stoneville, MS, Category II Research Entomologist
• 2009 to 2010, Southern Insect Management Research Unit, USDA, ARS, Stoneville, MS, Category III Research Entomologist
• 2006 to 2009, National Biological Control Laboratory, USDA, ARS, Stoneville, MS, Category III Research Entomologist
• 1999 to 2006, Mississippi State University, USDA- ARS- BCPRU, Department of Entomology and Plant Pathology, Research Associate II
• 1994 to 2006, National Federation of Colombian Coffee Growers, CENICAFE, Chinchina, Caldas, Colombia, Category I Research Entomologist
• 1988 to 1994, National Federation of Colombian Coffee Growers, CENICAFE, Chinchina, Caldas, Colombia, Research Associate
• 1986 to 1988, Colombian Agricultural Institute, ICA, Colombia, Research Assistant

Participation in Scientific Meetings

• Entomological Society of Colombia (1990 to 2000). Attended 10 meetings and made 14 presentations.
• Entomological Society of America (2000 to present). Attended 14 meetings and made 14 presentations.
• Mississippi Entomological Society (2002 to present). Attended 8 annual meetings and made 8 presentations.
• Invited to present research results at 10 International meetings in symposia, seminars, and workshops.

Honors, Awards, Achievements and Recognition

• Nominated seven times the Colombian National Science Prize "Alejandro Angel Escobar" (1990, 1991, 1992, 1993, 1994, 1996 and 1997). Entomological Society of Colombia.
• Member Nominating Committee, Entomological Society of Colombia, 1995-1997. Doctoral Research Scholarship, British Overseas Development Administration (ODA), 1994-1999.
• Member, President's Commission on the Status of Minorities, Mississippi State University 2002 - 2007.
• Honorary Professor, Conferred by National University of San Martin. San Martin, Peru May 25, 2007.

Technical Responsibilities

Dr. Portilla is currently doing research on biology, ecology and biological control of tarnished plant bug. Studies include rearing methods, developed bioassays to examine pathogenicity on new and existing microbial agents, entomopathogenic fungi resistance, sampling methods, and effect of entomopathogenic fungi on non-target insects including other insects attacking southern row crops (noctuid and pentatomid) and native or imported parasitoids and predators. The goal of the research is to study insect-pathogen relationships, and develop and new and effective microbial control method to integrate with cultural and chemical control methods to the management of tarnished plant bug and other cotton pests.

• Projects

  Insect Control and Resistance Management in Corn, Cotton, Sorghum, Soybean, and Sweet Potato, and Alternative Approaches to Tarnished Plant Bug Control in the Southern United States In-House Appropriated (D)   Accession Number:438523

  Understanding Stink Bug-soybean Looper Interactions in Soybean in Arkansas and Mississippi Non-Assistance Cooperative Agreement (S)   Accession Number:445121

• Publications

  • (Clicking on the reprint icon will take you to the publication reprint.)
  • Residual activity of the most common insecticides used in the Mississippi Delta to control tarnished plant bugs in cotton-(Abstract Only)
    
    
  • Evaluation and Efficacy of Oral Biomarkers for Lygus Lineolaris1 -(Peer Reviewed Journal)
    Glover, J.P., Parys, K.A., George, J., Little, N., Portilla, M. 2024. Evaluation and Efficacy of Oral Biomarkers for Lygus Lineolaris1. Southwestern Entomologist. 49(2):713-732. https://doi.org/10.3958/059.049.0216.
    
  • Biology, Ecology, and Management of Redbanded Stink Bug, Piezodorus guildinii -(Review Article)
    Okosun, O., George, J., Portilla, M., Glover, J.P., Parys, K.A., Reddy, G.V. 2024. Biology, Ecology, and Management of Redbanded Stink Bug, Piezodorus guildinii. Journal of Integrated Pest Management. 15(1):27. https://doi.org/10.1093/jipm/pmae019.
    
  • Natural incidence of Beaveria bassianna as biological control agent of tarnished plant bug and stink bugs in Mississippi Delta-(Abstract Only)
    
    
  • Sublethal effects of a commercial Bt product and Bt cotton flowers on the bollworm (Helicoverpa zea) with impacts to predation from a lady beetle (Hippodamia convergens) -(Peer Reviewed Journal)
    Elkins, B.H., Portilla, M., Allen, K.C., Little, N., Mullen, R.M., Paulk, R.T., Read, Q.D. 2024. Sublethal effects of a commercial Bt product and Bt cotton flowers on the bollworm (Helicoverpa zea) with impacts to predation from a lady beetle (Hippodamia convergens). PLOS ONE. 19(5):e0302941. https://doi.org/10.1371/journal.pone.0302941.
    
  • Effects of Beauveria bassiana on the growth and reproductive rates of Nezara viridula -(Peer Reviewed Journal)
    Portilla, M., Tertuliano, M., Parys, K.A., Reddy, G.V., Glover, J.P. 2024. Effects of Beauveria bassiana on the growth and reproductive rates of Nezara viridula. BioControl. https://doi.org/10.1007/s10526-024-10258-1.
    
  • Effectiveness and residual activity of four common insecticides used in the Mississippi Delta to Control Tarnished Plant Bugs in Cotton -(Peer Reviewed Journal)
    Portilla, M., Little, N., Allen, K.C., Zhu, Y. 2024. Effectiveness and residual activity of four common insecticides used in the Mississippi Delta to Control Tarnished Plant Bugs in Cotton. PLOS ONE. 19(6)01-20. https://doi.org/10.1371/journal.pone.0290858.
    
  • Assessing the Efficacy of Sodium Alginate and Polyacrylamide as Spray Adjuvants Combined with Bifenthrin and Imidacloprid against Lygus lineolaris and Piezodorus guildinii -(Peer Reviewed Journal)
    Du, Y., Scheibener, S.A., George, J., Kannan, N., Portilla, M. 2024. Assessing the Efficacy of Sodium Alginate and Polyacrylamide as Spray Adjuvants Combined with Bifenthrin and Imidacloprid against Lygus lineolaris and Piezodorus guildinii. Agriculture. 14(4):535. https://doi.org/10.3390/agriculture14040535.
    
  • Microarray and functional pathway analyses revealed significantly elevated gene expressions associated with metabolic resistance to oxamyl (vydate) in lygus lineolaris -(Peer Reviewed Journal)
    Zhu, Y., Du, Y., Liu, X.F., Portilla, M., Chen, J. 2024. Microarray and functional pathway analyses revealed significantly elevated gene expressions associated with metabolic resistance to oxamyl (vydate) in lygus lineolaris. Toxics. 12(3). Article 188. https://doi.org/10.3390/toxics12030188.
    
  • Functional transgenes in Mexican maize: benefit and risks for insect pest management in Mexico and the United States-(Peer Reviewed Journal)
    Blanco, C., Hernandez, G., Conover, K., Portilla, M., Valentini, G., Alvarado, A., Fosado, A., Abel, C.A., Dively, G., Guzman, H., Israel, L., Occelli, L., Knolhoff, L., Corona, M., Vega, P., Macias, P., Ward, T., Urbano, N. 2024. Functional transgenes in Mexican maize: benefit and risks for insect pest management in Mexico and the United States. Annals of the Entomological Society of America. https://doi.org/10.1093/aesa/saae007.
    
  • Severe Defoliation of Vegetative Maize Plants Does Not Reduce Grain Yield: Further Implications with Action Threshold-(Peer Reviewed Journal)
    Blanco, C., Conover, K., Dively, G., Hernandez, G., Portilla, M., Nava-Camberos, U., Abel, C.A., Williams, P., Hutchison, W. 2023. Severe Defoliation of Vegetative Maize Plants Does Not Reduce Grain Yield: Further Implications with Action Threshold. Southwestern Entomologist. https://doi.org/10.3958/059.048.0404.
    
  • Assessment of the toxicity of four formulated pyrethroid-containing binary insecticides in susceptible and resistant adult tarnished plant bug, Lygus Lineolaris -(Peer Reviewed Journal)
    Du, Y., Zhu, Y., Portilla, M. 2023. Assessment of the toxicity of four formulated pyrethroid-containing binary insecticides in susceptible and resistant adult tarnished plant bug, Lygus Lineolaris. Insects. https://doi.org/10.3390/insects14090761.
    
  • Effects of Beauveria bassiana on the growth and reproductive rates of Nezara viridula (Heteroptera: Pentatomidae).-(Abstract Only)
    
    
  • Field evaluation of biological and conventional insecticides for managing multiple insect pests in cotton -(Peer Reviewed Journal)
    Little, N., Elkins, B.H., Portilla, M., Allen, K.C., Read, Q.D., Paulk, R.T. 2024. Field evaluation of biological and conventional insecticides for managing multiple insect pests in cotton. Journal of Entomological Science. https://doi.org/10.18474/JES23-37.
    
  • Resistance risk assessment of six pyrethroids and acephate toward the resistant adult tarnished plant bug, Lygus lineolaris (Palisot de Beauvois) -(Peer Reviewed Journal)
    Du, Y., Scheibener, S.A., Zhu, Y., Portilla, M., Zhang, M(2023)Resistance risk assessment of six pyrethroids and acephate toward the resistant adult tarnished plant bug, Lygus lineolaris (Palisot de Beauvois). Insect Science. https://doi.org/10.1111/1744-7917.13280.
    
  • Biochemical and molecular characterization of neonicotinoid resistance in the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois) -(Peer Reviewed Journal)
    Du, Y., Scheibener, S.A., Zhu, Y., Portilla, M., Reddy, G.V. 2023. Biochemical and molecular characterization of neonicotinoid resistance in the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois). Comparative Biochemistry and Physiology. https://doi.org/10.1016/j.cbpc.2023.109765.
    
  • Entomopathogenicity of ascmycete fungus Cordyceps militaris on the cotton bollworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) -(Peer Reviewed Journal)
    Glover, J.P., Nufer, M., Perera, O.P., Portilla, M., George, J. 2023. Entomopathogenicity of ascmycete fungus Cordyceps militaris on the cotton bollworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae). The Journal of Fungi. https://doi.org/ 10.3390/jof9060614.
    
  • The mechanism of metabolic resistance to pyrethroids and neonicotinoids fade away without selection pressure in the tarnished plant bug Lygus Lineolaris -(Peer Reviewed Journal)
    Du, Y., Zhu, Y., Portilla, M., Zhang, M., Reddy, G.V. 2023. The mechanism of metabolic resistance to pyrethroids and neonicotinoids fade away without selection pressure in the tarnished plant bug Lygus Lineolaris. Pest Management Science. https://doi.org/10.1002/ps.7570.
    
  • Lethal concentration and sporulation by contact and direct spray of the entomopathogenic fungus Beauveria bassiana on different stages of Nezara viridula (Heteroptera: Pentatomidae) -(Peer Reviewed Journal)
    Portilla, M., Zhang, M., Glover, J.P., Johnson, C.P., Reddy, G.V. 2022. Lethal concentration and sporulation by contact and direct spray of the entomopathogenic fungus Beauveria bassiana on different stages of Nezara viridula (Heteroptera: Pentatomidae). The Journal of Fungi. https://doi.org/10.3390/jof8111164.
    
  • Susceptibility of different life stages of kudzu bug Megacopta cribraria (F.) (Hemiptera: Plataspidae) to two different strains of Beauveria bassiana -(Peer Reviewed Journal)
    Glover, J.P., Portilla, M., Allen, K.C., George, J., Parys, K.A., Reddy, G.V. 2022. Susceptibility of different life stages of kudzu bug Megacopta cribraria (F.) (Hemiptera: Plataspidae) to two different strains of Beauveria bassiana. Pathogens. 11:1-10. https://doi.org/10.3390/pathogens11091028.
    
  • Fitness and survival of Helicoverpa zea (Lepidoptera: Noctuidae) on five weedy host plants commonly found across the Mid-South -(Peer Reviewed Journal)
    Glover, J.P., Reddy, G.V., Portilla, M. 2023. Fitness and survival of Helicoverpa zea (Lepidoptera: Noctuidae) on five weedy host plants commonly found across the Mid-South. Florida Entomologist. 106(1):45-50. https://doi.org/10.1653/024.106.0107.
    
  • Effect of two strains of Beauveria bassiana on the Fecundity of Nezara viridula L. (Heteroptera: Pentatomidae) -(Peer Reviewed Journal)
    Portilla, M., Reddy, G.V., Terluliano, M. 2022. Effect of two strains of Beauveria bassiana on the Fecundity of Nezara viridula L. (Heteroptera: Pentatomidae). Microbiology Research. 13(3):514-522. https://doi.org/10.3390/microbiolres13030035.
    
  • Grain yield is not impacted by early defoliation of maize: implications for Fall armyworm action thresholds -(Peer Reviewed Journal)
    Blanco, C., Conover, K., Hernandez, G., Valentini, G., Portilla, M., Abel, C.A., Williams, W.P., Nava-Camberos, U., Huschison, W., Dively, G. 2022. Grain yield is not impacted by early defoliation of maize: implications for Fall armyworm action thresholds. Southwestern Entomologist. 47(2):335-344. https://doi.org/10.3958/059.047.0209.
    
  • Infectivity of Entomopathogenic fungal isolates against tarnished plant bug -(Peer Reviewed Journal)
    Maniania, N.K., Portilla, M., Amnulla, F.M., Mfuti, D.K., Darie, A., Dhiman, G., Rao, I.M. 2022. Infectivity of Entomopathogenic fungal isolates against tarnished plant bug. Journal of Insect Science. 22:1-7. https://doi.org/10.1093/jisesa/ieac040.
    
  • Development of a method for rearing Nezara viridula (Heteroptera: Pentatomidae) on a semi-solid artificial diet -(Peer Reviewed Journal)
    Portilla, M., Reddy, G.V. 2021. Development of a method for rearing Nezara viridula (Heteroptera: Pentatomidae) on a semi-solid artificial diet. Journal of Insect Science. 21(5):1-8. https://doi.org/10.1093/jisesa/ieab068.
    
  • Risk assessment of ozone fumigation under vacuum to control potential infestation of coffee berry borer and coffee leaf rust in green coffee beans imported into Hawaii -(Peer Reviewed Journal)
    Portilla, M., Follett, P.A., Armstrong, J.W., Leesch, J.G., Tebbets, J.S., Smilanick, J.L., Mchugh, T.H., Olsen, C.W., Whitehand, L.C., Cavaletto, C., Bittenbender, H., Bustillo, A., Pena, J.E. 2021. Risk assessment of ozone fumigation under vacuum to control potential infestation of coffee berry borer and coffee leaf rust in green coffee beans imported into Hawaii. Journal of Economic Entomology. 114(6):2277-2289. https://doi.org/10.1093/jee/toab165.
    
  • Biological responses of Hpothenemus hampei (Coleoptera: curculionidae) on the Cenibroca artificial diet at different moisture content levels and relative humidities -(Peer Reviewed Journal)
    Portilla, M., Streett, D. 2022. Biological responses of Hpothenemus hampei (Coleoptera: curculionidae) on the Cenibroca artificial diet at different moisture content levels and relative humidities. Florida Entomologist. 105(2):137-144. https://doi.org/10.1653/024.105.0206.
    
  • A laboratory diet-overlay bioassay to monitor resistance in Lygus lineolaris (Hemiptera: Miridae) to insecticide commonly used in the Mississippi Delta -(Peer Reviewed Journal)
    Portilla, M. 2020. A laboratory diet-overlay bioassay to monitor resistance in Lygus lineolaris (Hemiptera: Miridae) to insecticide commonly used in the Mississippi Delta. Journal of Insect Science. 20:4;1-13. https://doi.org/10.1093/jisesa/ieaa067.
    
  • Effect of two Bacillus thuringiensis proteins on the development of the fall armyworm after a seven-day exposure -(Peer Reviewed Journal)
    Portilla, M., Blanco, C.A., Arias De Ares, R.S., Zhu, Y. 2020. Effect of two Bacillus thuringiensis proteins on the development of the fall armyworm after a seven-day exposure. Southwestern Entomologist. https://doi.org/10.3958/059.045.0208.
    
  • Effectiveness of Beauveria bassiana against Piezodorus guildinii (Hemiptera: Pentatomidae), a key pest of soybeans in the Neotropics -(Peer Reviewed Journal)
    Parys, K.A., Portilla, M. 2020. Effectiveness of Beauveria bassiana against Piezodorus guildinii (Hemiptera: Pentatomidae), a key pest of soybeans in the Neotropics. Biocontrol Science and Technology. 30:5 451-461. https://doi.org/10.1080/09583157.2020.1731426.
    
  • NoVil: Hunt for weevil control: Update! Microbial and Nematode Control of Invertebrate Pest-(Peer Reviewed Journal)
    Maniania, N.K., Portilla, M., Amnulla, F.M., Darie, A., Ghiman, G., Rao, I.M. 2020. NoVil: Hunt for weevil control: Update! IOBC/WPRS Bulletin (Abstract for Conference Proceedings). 150:33-38.
    
  • Risk and toxicity assessment of a potential natural insecticide, methyl benzoate, in honey bees (Apis mellifera L.) -(Peer Reviewed Journal)
    Zhu, Y., Wang, Y., Portilla, M., Parys, K.A., Li, W. 2019. Risk and toxicity assessment of a potential natural insecticide, methyl benzoate, in honey bees (Apis mellifera L.). Insects. 10:382. https://doi.org/10.3390/insects10110382.
    
  • Improving risk assessment of noctuid pests at North American ports and farms by differentiating egg morphology -(Peer Reviewed Journal)
    Blanco, C.A., Rosario-Lebron, A., O'Donnell, C.A., Portilla, M., Gullbronson, C., Mowery, J.D., Smith-Pardo, A.H., Stocks, I., Nadel, H., Trozzo, L.R., Haslem, P.S., Young, J.D., Downes, S., Parker, T., Walsh, T., Tay, W., Oppenheim, S. 2019. Improving risk assessment of noctuid pests at North American ports and farms by differentiating egg morphology. Annals of the Entomological Society of America. saz029:1-8. https://doi.org/10.1093/aesa/saz029.
    
  • Laboratory and field investigations on compatibility of Beauveria bassiana spores with a sprayable bioplastic formulation for application in the biocontrol of tarnished plant bug in cotton -(Peer Reviewed Journal)
    Portilla, M., Abbas, H.K., Accinelli, C., Luttrell, R.G. 2018. Laboratory and field investigations on compatibility of Beauveria bassiana spores with a sprayable bioplastic formulation for application in the biocontrol of tarnished plant bug in cotton. Journal of Economic Entomology. 112(2):549-557. https://doi.org/10.1093/JEE/toy382.
    
  • A novel method to evaluate the reproductive potential of Phymastichus Coffea (Hymenoptera: Eulophydae) in Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) under laboratory conditions-(Peer Reviewed Journal)
    Portilla, M., Streett, D.A., Grodowitz, M.J. 2018. A novel method to evaluate the reproductive potential of Phymastichus Coffea (Hymenoptera: Eulophydae) in Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) under laboratory conditions. Journal of Insect Science. 18(6):1-7.
    
  • Comparison of three bioassay methods to estimate levels of tarnished plant bug (Hemiptera: Miridae) susceptibility to acephate, imidacloprid, permethrin, sulfoxaflor, and thiamethoxam -(Peer Reviewed Journal)
    Portilla, M., Luttrell, R.G., Parys, K.A., Little, N., Allen, K.C. 2018. Comparison of three bioassay methods to estimate levels of tarnished plant bug (Hemiptera: Miridae) susceptibility to acephate, imidacloprid, permethrin, sulfoxaflor, and thiamethoxam. Journal of Economic Entomology. 1-10. https://doi.org/10.1093/jee/toy244.
    
  • Simple methods to devitalize eggs and larvae of Heliothis virescens and Helicoverpa zea under laboratory conditions -(Peer Reviewed Journal)
    Blanco, C., Finkenbinder, C., Morris, A., Blenderman, D., Portilla, M. 2018. Simple methods to devitalize eggs and larvae of Heliothis virescens and Helicoverpa zea under laboratory conditions. Southwestern Entomologist. 43(3):563-569. https://doi.org/10.3958/059.043.0301.
    
  • Patterns of tarnished plant bug (Heteroptera: Miridae) resistance to pyrethroid insecticides in the lower Mississippi Delta for 2008-2015: Linkage to pyrethroid use and cotton insect management -(Peer Reviewed Journal)
    Parys, K.A., Luttrell, R.G., Snodgrass, G.L., Portilla, M. 2018. Patterns of tarnished plant bug (Heteroptera: Miridae) resistance to pyrethroid insecticides in the lower Mississippi Delta for 2008-2015: Linkage to pyrethroid use and cotton insect management. Journal of Insect Science. 18(2):29. https://doi.org/10.1093/jisesa/iey015.
    
  • Abridged life tables for Cephalonomia stephanoderis and Prorops nasuta (Hymenoptera: Bethylidae) Parasitoids of Hypothenemus hampei (Coleoptera: Scolytidae) reared on artificial diet-(Peer Reviewed Journal)
    Portilla, M., Grodowitz, M.J. 2018. Abridged life tables for Cephalonomia stephanoderis and Prorops nasuta (Hymenoptera: Bethylidae) Parasitoids of Hypothenemus hampei (Coleoptera: Scolytidae) reared on artificial diet. Journal of Insect Science. 18(2):1-7. doi:10.1093/jisesa/iey013.
    
  • Longitudinal measurements of tarnished plant bug (Hemiptera: Miridae) susceptibility to insecticides in Arkansas, Louisiana and Mississippi: Associations with insecticide use and insect control recommendations -(Peer Reviewed Journal)
    Parys, K.A., Luttrell, R.G., Snodgrass, G.L., Portilla, M., Copes, J. 2017. Longitudinal measurements of tarnished plant bug (Hemiptera: Miridae) susceptibility to insecticides in Arkansas, Louisiana and Mississippi: Associations with insecticide use and insect control recommendations. Insects. 8(4),109. https://doi.org/10.3390/insects8040109.
    
  • Lethal and sub-lethal effect of Beauveria bassiana strain NI8 on Chrysoperla rufilabris (Neuroptera:Chrysopidae) -(Peer Reviewed Journal)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2017. Lethal and sub-lethal effect of Beauveria bassiana strain NI8 on Chrysoperla rufilabris (Neuroptera:Chrysopidae). Florida Entomologist. 100(3):627-633. https://doi.org/10.1653/024.100.0321.
    
  • Lethality of the entomogenous fungus Beauveria bassiana strain NI8 on Lygus lineolaris (Hemiptera: Miridae) and its possible impact on beneficial arthropods -(Peer Reviewed Journal)
    Portilla, M., Luttrell, R.G., Snodgrass, G.L., Zhu, Y., Riddick, E.W. 2017. Lethality of the entomogenous fungus Beauveria bassiana strain NI8 on Lygus lineolaris (Hemiptera: Miridae) and its possible impact on beneficial arthropods. Journal of Entomological Science. 52(4):352-369. https://doi.org/10.18474/JES17-15.1.
    
  • Estimation of median lethal concentration of three isolates of Beauveria bassiana for control of Megacopta cribraria (Heteroptera: Plataspidae) bioassayed on solid Lugys Spp. Diet² -(Peer Reviewed Journal)
    Portilla, M., Jones, W.A., Perera, O.P., Seiter, N., Greene, J., Luttrell, R.G. 2016. Estimation of median lethal concentration of three isolates of Beauveria bassiana for control of Megacopta cribraria (Heteroptera: Plataspidae) bioassayed on solid Lugys Spp. Diet². Insects. 7(3):31. doi: 10.3390/insects7030031.
    
  • Analysis of tarnished plant bug movement using carbon and nitrogen isotopes-(Proceedings)
    
    
  • Demographic parameters of Nezara viridula (L.) (Heteroptera: Pentatomidae) reared on two diets developed for Lygus spp -(Peer Reviewed Journal)
    Portilla, M., Snodgrass, G.L., Street, D., Luttrell, R.G. 2015. Demographic parameters of Nezara viridula (L.) (Heteroptera: Pentatomidae) reared on two diets developed for Lygus spp. Journal of Insect Science. 15(1):165. doi: 10.1093/jisesa/iev144.
    
  • Ecology, Behavior and Bionomics: First Genotyping of Spodoptera frugiperda (J. E. Smith)(Lepidoptera: Noctuidae) Progeny from Crosses between Bt-Resistant and Bt-Susceptible Populations, and 65-Locus Discrimination of Isofami-(Peer Reviewed Journal)
    Arias De Ares, R.S., Portilla, M., Ray, J.D., Blanco, C.A., Simpson, S.A., Scheffler, B.E. 2015. Ecology, Behavior and Bionomics: First Genotyping of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) Progeny from Crosses between Bt-Resistant and Bt-Susceptible Populations, and 65-Locus Discrimination of Isofamilies. The Journal of Botanical Society. 4:18-29.
    
  • Evidence of multiple/cross resistance to Bt and Organophosphate insecticides in Puerto Rico population of the fall armyworm, Spodoptera frugiperda-(Peer Reviewed Journal)
    Zhu, Y., Blanco, C.A., Portilla, M., Adamczyk Jr, J.J., Luttrell, R.G., Huang, F. 2015. Evidence of multiple/cross resistance to Bt and Organophosphate insecticides in Puerto Rico population of the fall armyworm, Spodoptera frugiperda. Pesticide Biochemistry and Physiology. 122:15-21;doi.org/10.1016/j.pestbp.2015.01.007.
    
  • Artificial diets for life tables bioassays of TPB in Mississippi-(Review Article)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2014. Artificial diets for life tables bioassays of TPB in Mississippi. Midsouth Entomologist. 7:128-135.
    
  • Mississippi Delta native strain of Beauveria bassiana for control of TPB-(Review Article)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2014. Mississippi Delta native strain of Beauveria bassiana for control of TPB. Midsouth Entomologist. 7:82-88.
    
  • Biological control as an alternative measure for TPB in Mississippi-(Review Article)
    Portilla, M. 2014. Biological control as an alternative measure for TPB in Mississippi. Midsouth Entomologist. 7:38-46.
    
  • Effects of morning and night application of Beauveria bassiana strains NI8 and GHA against the tarnished plant bug in cotton-(Abstract Only)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2014. Effects of morning and night application of Beauveria bassiana strains NI8 and GHA against the tarnished plant bug in cotton. National Cotton Council Beltwide Cotton Conference. Belwide Cotton conference, January 5-8, 2014, New Orleans, LA. pp.729-734.
    
  • A comparison of diapause termination in tarnished plant bugs (Hemiptera: Miridae) from the Mississippi Delta and Springfield, Illinois-(Peer Reviewed Journal)
    Snodgrass, G.L., Jackson, R.E., Perera, O.P., Allen, K.C., Portilla, M. 2013. A comparison of diapause termination in tarnished plant bugs (Hemiptera: Miridae) from the Mississippi Delta and Springfield, Illinois. Southwestern Entomologist. 38(3):385-392.
    
  • A novel bioassay to evaluate the potential of Beauveria bassiana strain NI8 and the Insect growth regulator novaluron against Lygus lineolaris on a non-autoclaved solid artificial diet-(Peer Reviewed Journal)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2014. A novel bioassay to evaluate the potential of Beauveria bassiana strain NI8 and the insect growth regulator novaluron against Lygus lineolaris on a non-autoclaved solid artificial diet. Journal of Insect Science. 14:1-13. Available online: http://www.insectscience.org/14.114.
    
  • Life tables as tools of evaluation and quality control for arthropod mass production-(Book / Chapter)
    Portilla, M., Morales Ramos, J.A., Rojas, M.G., Blanco, C. 2013. Life tables as tools of evaluation and quality control for arthropod mass production. In: J. A. Morales-Ramos, M. G. Rojas and D. I. Shapiro-Ilan [Eds.]. Mass Production of Beneficial Organisims: Invertebrates and Entomopathogens. Academic Press, San Diego, CA. pgs 241-275.
    
  • Field evaluation on the lethal effect of Beauveria bassiana strains NI8 and GHA against the tarnished plant bug in cotton-(Abstract Only)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2014. Field evaluation on the lethal effect of Beauveria bassiana strains NI8 and GHA against the tarnished plant bug in cotton. National Cotton Council Beltwide Cotton Conference. Proceeding of Beltwide Cotton Conferences, January 7-10, 2013 San Antonio, Texas p.254.
    
  • Use of a mustard trap crop to study efficacy of Beauveria bassiana treatments to corn and soybean for control of tarnished plant bug in cotton-(Abstract Only)
    Luttrell, R.G., Houston, R.O., Portilla, M., Snodgrass, G.L., Jackson, R.E. 2013. Use of a mustard trap crop to study efficacy of Beauveria bassiana treatments to corn and soybean for control of tarnished plant bug in cotton. National Cotton Council Beltwide Cotton Conference. Beltwide Cotton Conference, January 7-10, 2013, San Antonio, TX. p.1007.
    
  • A novel bioassay to evaluate Beauveria bassiana strain NI8 and the insect growth regulator, novaluron, against Lygus lineolaris on a non-autoclaved solid artificial diet-(Abstract Only)
    Portilla, M., Snodgrass, G.L., Luttrell, R.G. 2012. A novel bioassay to evaluate Beauveria bassiana strain NI8 and the insect growth regulator, novaluron, against Lygus lineolaris on a non-autoclaved solid artificial diet. National Entomological Society of America Annual Meeting. Proceeding of 3rd Intenational Lygus Symposium, October 28-31, 2012, Scottsdal, AZ. http://ag.arizona.edu/apmc/3rdILS/Presentations_and_Posters/Portilla_poster.pdf
    
  • Effect of modification of the NI artificial diet on the biological fitness parameters of mass reared Western Tarnished Plant Bug, Lygus hesperus-(Peer Reviewed Journal)
    Portilla, M., Snodgrass, G.L., Streett, D. 2011. Effect of modification of the NI artificial diet on the biological fitness parameters of mass reared Western Tarnished Plant Bug, Lygus hesperus. Journal of Insect Science. 11:149. doi:10.1673/031.011.14901.
    
  • Reduced levels of membrane-bound alkaline phosphatase are common to lepidopteran strains resistant to Cry toxins from Bacillus thuringiensis-(Peer Reviewed Journal)
    Jurat-Fuentes, J., Karumbahiah, L., Jakka, S.K., Ning, C., Liu, C., Wu, K., Jackson, J., Gould, F., Blanco, C., Portilla, M., Perera, O.P., Adang, M.J. 2011. Reduced levels of membrane-bound alkaline phosphatase are common to lepidopteran strains resistant to Cry toxins from Bacillus thuringiensis. PLoS One. 6:e17606.
    
  • First microsatellites from Spodoptera frugiperda (Lepidoptera: Noctuidae) and their potential use for population genetics-(Peer Reviewed Journal)
    Arias, R.S., Blanco, C.A., Portilla, M., Snodgrass, G.L., Scheffler, B.E. 2011. First microsatellites from Spodoptera frugiperda (Lepidoptera: Noctuidae) and their potential use for population genetics. Annals of the Entomological Society of America. 104(3):576-587.
    
  • First microsatellites developed from Spodoptera frugiperda and their potential use for population genetics-(Abstract Only)
    Arias De Ares, R.S., Blanco, C.A., Portilla, M., Snodgrass, G.L., Scheffler, B.E. 2011. First microsatellites developed from Spodoptera frugiperda and their potential use for population genetics. Entomology Society America Annual Meeting. 104(3):516-587.
    
  • Efecto de la dieta artificial MP sobre la emergencia y relacion de sexos de Phymastichus coffea (Hymenoptera:Eulophidae) mantenido sobre su hueped, Hypothenemus hampei (Coleoptera: Scloytidae)a traves de generaciones contin -(Peer Reviewed Journal)
    
    
  • Susceptibility of Spodoptera frugiperda (Lepidoptera: noctuidae) isofamilies to Cry1Ac and Cry1F proteins of Bacillus thuringiensis-(Peer Reviewed Journal)
    Blanco, C., Portilla, M., Jurat-Fuentes, J., Sanchez, J.F., Viteri, D., Vega-Aquin, P., Teran-Vargas, A.P., Azuara-Dominguez, A., Lopez, J., Arias De Ares, R.S., Zhu, Y., Barrera, D., Jackson, R.E. 2010. Susceptibility of Spodoptera frugiperda (Lepidoptera: noctuidae) isofamilies to Cry1Ac and Cry1F proteins of Bacillus thuringiensis. Southwestern Entomologist. 35(3):409-415.
    
  • Life Table and Laboratory Rearing of Nezara viridula (L.) (Heteroptera: Pentatomidae) on two Artificial Diets-(Other)
    Portilla, M., Streett, D. A. 2008. Life Table and Laboratory Rearing of Nezara viridula (L.) (Heteroptera: Pentatomidae) on two Artificial Diets. Meeting Abstract.
    
  • Producción masiva automatizada de la broca del café Hypothenemus hampei Ferrari (Coleóptera: Scolytidae) y de sus parasitoides sobre dietas artificiales-(Peer Reviewed Journal)
    Portilla, M., Streett, D.A. 2008. Producción masiva automatizada de la broca del café Hypothenemus hampei Ferrari (Coleóptera: Scolytidae) y de sus parasitoides sobre dietas artificiales.. Sistemas Agroecologicos y Modelos Biomatematicos. 1(1)9-24.
    
  • Plant Host Effect on the Development of Heliothis virescens (F.) (Lepidoptera: noctuidae)-(Peer Reviewed Journal)
    Blanco, C.A., Teran-Vargas, A.P., Abel, C.A., Portilla, M., Rojas, M.G., Morales Ramos, J.A. 2008. Plant Host Effect on the Development of Heliothis virescens (F.) (Lepidoptera: noctuidae). Environmental Entomology. 37(6):1538-1547.
    
  • Soybean Flour and Wheat Germ Proportions in Insect Artificial Diet and Their Effect on the Growth Rates of Heliothis virescens (F.) (Lepidoptera: Noctuidae)-(Peer Reviewed Journal)
    Blanco, C.A., Portilla, M., Abel, C.A., Winters, H.E., Ford, R.L., Streett, D.A. 2009. Soybean Flour and Wheat Germ Proportions in Insect Artificial Diet and Their Effect on the Growth Rates of Heliothis virescens (F.) (Lepidoptera: Noctuidae). Journal of Insect Science. 9:52
    
  • Nueva dieta artificial para la producción masiva de Phymastichus Coffea (Himenóptera: Eulophidae) parasitoide de la broca del café, Hypothenemus hampei (Coleoptera: Scolytidae).-(Abstract Only)
    Portilla, M., Streett, D.A. 2007. Nueva dieta artificial para la producción masiva de Phymastichus Coffea (Himenóptera: Eulophidae) parasitoide de la broca del café, Hypothenemus hampei (Coleoptera: Scolytidae). Entomological Society of Peru. XLIX Resumenes p. 35.
    
  • Developing Methods to Evaluate Reproduction Rates of Pseudacteon curvatus (Diptera: Phoridae) in Solenopsis richteri (Hymenoptera: Formicidae)-(Proceedings)
    Portilla, M., Streett, D.A., Vogt, J.T. Developing Methods to Evaluate Reproduction Rates of Pseudacteon curvatus (Diptera: Phoridae) in Solenopsis richteri (Hymenoptera: Formicidae). Imported Fire Ants Conference Proceedings. pp. 78-79. 2007.
    
  • Producción masiva automatizada de la broca del café, Hypothenemus hampei (Coleoptera: Scolytidae) sobre la dieta artificial Cenibroca modificada.-(Proceedings)
    Portilla, M., Streett, D.A. 2007. Producción masiva automatizada de la broca del café, Hypothenemus hampei (Coleoptera: Scolytidae) sobre la dieta artificial Cenibroca modificada.. Manejo Da Broca-Do-Cafe' Workshop International. 185-192pp.
    

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