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Plant-Insect Ecosystems

Student Competition Poster

Grad P-IE: Behavior and Ecology

D3035: Effects of surrounding landscapes on the fork-tailed bush katydid (Scudderia furcata) in California Citrus

Monday, November 1, 2021
9:00 AM – 6:30 PM MT
Location:: Exhibit Hall F
Student Competition In-Person Poster

    Presenting Author(s)

  • Mia K. Lippey

    Graduate Student
    University of California, Davis
    Foster City, California, United States

    • Co-Author(s)

  • Jay A. Rosenheim

    University of California
    Davis, California, United States

  • EM

    Emily Meineke

    Assistant Professor
    University of California
    Davis, California, United States

Globally, humans are introducing large expanses of crop plants into natural areas, such that agricultural landscapes are now patchworks of resources with which native herbivores have no prior experience. When novel crop host plants are introduced, the cues that once signaled a high-quality host may no longer be reliable, and adult insects may oviposit on host plants that are actually unsuitable for the development of their offspring. These anthropogenic “habitat traps'' can thus attract pest populations that rely on immigration from surrounding habitats to persist. In such cases, identifying putative source plants in the surrounding landscape is critical for pest management. Here, we examine how surrounding land use affects abundances of the fork-tailed bush katydid, a key pest of California citrus. Though katydids feed heavily on introduced citrus, they survive poorly when raised on citrus alone. Therefore, we predict that host plants in surrounding landscapes contribute to the persistence of katydids in citrus groves. California citrus groves are situated in a wide array of land uses, including myriad non-citrus crops, citrus groves of diverse cultivars, developed urban and suburban land, rangeland, and more natural areas. To improve katydid management, we used an ecoinformatics approach to determine which of these surrounding landscape types support the population buildup of katydids. Our results suggest that specific land use types surrounding citrus groves mediate the buildup of a damaging pest.