Semester of Graduation

Spring 2026

Degree

Master of Science (MS)

Department

Entomology

Document Type

Thesis

Abstract

Redbanded stink bug Piezodorus guildinii (Westwood) is one of the most damaging pod-feeding insects in soybean (Glycine max (L.) Merr.), reducing both yield and seed quality. Although insecticide-based control remains effective, overreliance can lead to insecticide resistance, mortality of non-target organisms, and increased costs to growers. To address these concerns, alternative pest management strategies are being explored. Silicon fertilization demonstrated beneficial effects in enhancing plant resistance against insect pests and can also improve agronomic traits. This study was initiated to assess the effects of silicon soil amendments on redbanded stink bug infestations and soybean performance under both field and controlled conditions. Field experiments were conducted in 2024 and 2025 at the Dean Lee Research Station (Alexandria, LA), Macon Ridge Research Station (Winnsboro, LA), and the Texas A&M AgriLife Research and Extension Center (Beaumont, TX). A split-plot design with four blocks was used, consisting of factorial combinations of silicon treatment and redbanded stink bug control, with natural infestations monitored throughout the growing season. Greenhouse and laboratory assays were also conducted in Alexandria in 2025. Results from the two-year field experiments showed that silicon had weak effects on redbanded stink bug abundance, plant height, and seed damage. Although statistically insignificant, plant dry weight and seed dry weight were consistently higher in silicon-treated plants compared with the control. Similarly, weak effects of silicon on the relative growth rate of redbanded stink bug were observed in greenhouse and laboratory experiments.

Date

3-26-2026

Committee Chair

Stout, Michael

LSU Acknowledgement

1

LSU Accessibility Acknowledgment

1

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Available for download on Sunday, March 25, 2029

Included in

Entomology Commons

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