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POSTERS: Chemical and Biopesticide Control II

P-122 - Evaluation of fungicide timing and efficacy on the suppression of frogeye leaf spot (Cercospora sojina) in North Carolina

Tuesday, August 5, 2025
9:30 AM - 10:15 AM HST
Location: Exhibit Hall 3

    Presenting Author(s)

  • SH

    Shannon Holliday

    North Carolina State University
    Raleigh, North Carolina, United States

    • Author(s)

  • RV

    Rachel Vann

    North Carolina State University
    Raleigh, North Carolina, United States

  • DS

    DJ Stokes

    North Carolina State University
    Raleigh, North Carolina, United States

  • GT

    Grace Tisone, B.S.

    North Carolina State University
    Raleigh, North Carolina, United States

  • MB

    Meghan I. Bradburn, B.S.

    North Carolina State University
    Raleigh, NC, USA

  • LL

    LeAnn Lux

    North Carolina State University
    Raleigh, North Carolina, United States

Abstract Text: Soybeans are the largest acreage crop in the United States and in North Carolina (NC). NC soybean production is widely variable with maturity groups (MG) ranging anywhere from MG 3-MG 7, as well as planting dates varying from March-June. Important foliar diseases, such as frogeye leaf spot (FLS) caused by the fungal pathogen Cercospora sojina, can be challenging to manage under NC’s varying production systems. This prompts the continuous evaluation of chemistries and optimal timing on the suppression of FLS and protection of yield. Therefore, the objective for this research is to evaluate fungicide efficacy and optional timing of full season and double-crop soybeans under varying environmental conditions in NC. In 2024, soybean variety AG54XF0 was planted in three field experiments conducted at two locations in NC and organized in a randomized complete block design with four replications. The experiment consisted of 13 treatments including a non-treated control. Fungicides were applied at four different growth stages: R1, R1+R3, R3, and R5. The three chemistries used for the fungicides consisted of Pydiflumetofen + Difenoconazole (Miravis Top®), Mefentrifluconazole + Fluxapyroxad (Revylok®), and Bixafen + Flutriafol (Lucento®). Data collected included disease incidence and severity, yield (bu/ac), and weather patterns. Low to moderate levels of disease occurred across locations with fluctuating humidity and precipitation, which resulted in varying optimal application timing. Results from these experiments can be used to assist grower decision making.