​Research Publications:

  1. Han, J., MacWilliams, J., Schmidtbauer, M., Huntress, R., Mejia Alonzo, M.P., Hackenberg, L., Withycombe, J., Lovato, T.J., Wagstaff, C., Crowder, D.W., Creamer, R., Wilson, H., Britt, K., Shrestha, G., Frost, K., Rivedal, H.M., Ocamb, C.M., and Nachappa, P. 2026. Beet Curly Top Virus Genetic Diversity, Impact on Cannabinoids, Potential Seed Transmission, and Vector Biology in Hemp. Phytopathology. doi: 10.1094/PHYTO-09-25-0297-R
  2. MacWilliams, J., Padimi, V., Carter, O., Brownstein, K., Stanstell, Z., Gordon, T., and Nachappa, P. 2025. Assessing the adaptive role of cannabidivarinic acid (CBDVA) in aphid defense in Cannabis sativa. Journal of Cannabis Research. 7(34). doi: 10.1186/s42238-025-00291-x 
  3. Hackenberg, L., Han, J., MacWilliams, J., Kapuscinski, M. L., Stenglein, M., Fletcher, R., and Nachappa, P. 2025. Exploring the Hemp Virome and Assessing Hemp Germplasm for Resistance to an Emerging Pathogen. Phyobiomes. 9(1), 45-53. doi: 10.1094/PBIOMES-06-24-0068-R
  4. Grunwald, D. J., MacWilliams, J., Hackenberg, L., Stroschein, S., Rioux, R., Nachappa, P., and Ellison, S. 2024. A Multiplex RT-PCR for the Detection of Three Viruses and One Viroid Infecting Hemp. PhytoFrontiers. 4(4), 524-532. doi: 10.1094/PHYTOFR-02-23-0021-R​
  5. Punja, Z.K., Kahl, D., Reade, R., Xiang, Y., Munz, J., and Nachappa, P. 2023. Challenges to Cannabis sativa Production from Pathogens and Microbes-The Role of Molecular Diagnostics and Bioinformatics. Int J Mol Sci. Dec 19;25(1):14. doi: 10.3390/ijms25010014. PMID: 38203190; PMCID: PMC10779078.
  6.  MacWilliams, J., Peirce, E., Pitt, W.J**., Schreiner, M., Matthews, T.*, Yao, L., Broeckling, C., and Nachappa, P†. 2023. Assessing the adaptive role of cannabidiol (CBD) in Cannabis sativa defense against cannabis aphids. Front. Plant Sci. 14:1223894. doi: 10.3389/fpls.2023.1223894
  7. Carter*, C., MacWilliams, and Nachappa, P†. 2023. Development of a Real-Time PCR Assay for Detection of Hemp Russet Mite (Aculops cannabicola). Environmental Entomology nvad060. doi: 10.1093/ee/nvad060. Epub ahead of print. PMID: 37535869.
  8. Szczepaniec, A., Lathrop-Melting, A., Janecek, T., Nachappa, P., Cranshaw, W., Alnajjar, G. and Axtell,A. 2023.  Suppression of hemp russet mite, Aculops cannabicola (Acari: Eriophyidae), in industrial hemp in greenhouse and field, Environmental Entomology, nvad052, doi: 10.1093/ee/nvad052
  9. Chiginsky, J**., Langemeier, K*., MacWilliams, J., Albrecht, T., Cranshaw, W., Fulladolsa, AC., Kapuscinski, M, Stenglein, M., and Nachappa, P†. 2021. First insights into the virus and viroid communities in hemp (Cannabis sativa). Front. Agron. 3:778433. doi: 10.3389/fagro.2021.778433
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Code key: *undergrad student, **graduate student, †corresponding author.