UC Davis Nematologists Shine at International Society of Nematologists' Meeting

UC Davis nematologists shared the international spotlight at the 64th annual meeting of the Society of Nematologists (SON), held in Victoria, British Columbia.

Doctoral candidate Alison Blundell of the laboratory of associate professor Shahid Siddique, UC Davis Department of Entomology and Nematology, received the 2025 John M. Webster Outstanding Student Award from the Society of Nematologists at its recent meeting in Victoria, British Columbia. As the recipient of the $1500 prize, she presented a 30-minute talk on her research,   "Overcoming Resistance: Unraveling The Mechanisms Behind Root-knot Nematode Evasion of Tomato Mi-1 Gene."

Siddique delivered a keynote address, “Biotechnology and Genomics for Sustainable Nematode Management” in the international symposium series, which was sponsored by a grant received from the Organization for Economic Co-Operation and Development (OECD) and Co-Operative Research Programme: Sustainable Agricultural and Food Systems. It centered on the SON conference theme,  “Nematodes on the Move: Building Resilience and Sustainability through International Collaboration and Better Policies."

Siddique presented his keynote address under the realm of the symposium, “Reducing the Global Movement of Plant-Parasitic Nematodes and Rethinking Control Strategies,” Part 2.  Part 1 focused on “Understanding the Impact of Plant-Parasitic Nematodes on Global Food Security and Trade in a Changing World.”

Siddique was one of 14 keynote speakers from 11 countries across 5 continents participating in the discussion, which consisted of three plenary sessions.

Two doctoral candidates in the Siddique lab, Veronica Casey and Alison Blundell each won a travel award to attend the conference. Casey received the Hubbard Ag Science Award, and Blundell, the Bayer Award. 

Presenting talks were UC Davis Distinguished Professor Steve Nadler, former chair of the Department of Entomology and Nemtology; Amanda Hodson, assistant professor, and two postdoctoral researchers in the Siddique lab, Vera Putker and Bardo Castro. 

Nadler discussed "Phylogenetic Inference and the Diversity of Animal-Parasitic Nematodes";  Hodson,  "The Relationship Between Nematode Indicators and Soil Carbon Pools across Managed and Unmanaged Landscapes in California"; Putker, "GPA2-Induced Selection Pressure Does Not Select for 187S Allele of the Effector GPRBP-1 in Virulent Globodera Pallida Populations," and Bardo, "Biotechnology Approaches Against Root-Knot and Root Lesion Nematodes."

Alison Blundell, Webster Award Recipient

Blundell is the first UC Davis student to win the Webster award, launched in 2007 to recognize "a graduate student who has demonstrated outstanding accomplishments in his/her thesis research in nematology as well as other skills necessary to be a well-rounded scholar.” 

Blundell, who anticipates receiving her doctorate in 2026, joined the UC Davis doctoral program in 2020. She is completing her dissertation on “Trade-Offs Between Virulence and Evading Resistance in Root-Knot Nematodes.”  She investigates how root-knot nematodes overcome Mi-1 in tomatoes and is testing for susceptibility associated with resistance breaking. Mi-1 is a crucial gene in tomato plants that confers resistance against root-knot nematodes, which are parasitic nematodes that can and do severely damage crops. 

Blundell has collected root-knot nematodes (RKN) isolates from affected fields across the state, developed single egg mass cultures, and is now applying whole-genome sequencing to identify genetic signatures associated with resistance and its breakdown. Simultaneously, she is investigating whether resistance-breaking RKNs suffer fitness costs when rotated with non-host crops—an approach that could directly inform nematode management strategies for growers.

In addition to her scientific contributions, Blundell is involved in professional services with SON, including oral and poster presentations and as vice chair of the SON Graduate Student Committee. She engages in teaching, mentoring, and public outreach on the UC Davis campus. She promotes science education and agricultural awareness by volunteering at the annual UC Davis Picnic Day and the UC Davis Biodiversity Museum Day.

Active in SON, Blundell won first place in the Three-Minute Thesis Competition at the 2022 SON meeting. At the 2024 SON meeting, judges awarded her second place in the 12-Minute Best Student Paper Award Competition.

Blundell, formerly Alison Coomer, holds a  bachelor of science degree in biology and a bachelor of arts in chemistry (2020) from Concordia University, Seward, Neb., where she received the Outstanding Graduate Student in Biology Award.

The conference drew 179 attendees. The group experienced “a slightly lower attendance due to Visa concerns among foreign students attending U.S. universities,” a spokesman said. SON was formed in 1962 to advance the science of nematology in both its fundamental and economic aspects. Its membership stands at 356.