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P-IE

Student Competition 10-Minute Paper

Grad 10-min: P-IE, IPM Horticulture 1

Assessment of insecticide susceptibility in corn silk fly (Diptera: Ulidiidae) populations in South Florida

On-Demand
Student Competition On-Demand
Euxesta stigmatias, Euxesta eluta, and Chaetopsis massyla are three species of picture-winged fly (Diptera: Ulidiidae) pests of sweet corn in South Florida. Management of these flies relies primarily on pyrethroid applications. The increasing number of applications needed for adequate control is becoming a concern, suggesting the possibility of insecticide resistance development in some populations. Therefore, adult glass vial assays using technical grade beta-cyfluthrin were conducted in spring and summer 2020 to determine the susceptibility of these silk fly populations to pyrethroids. The results of the glass vial assays indicated an LC50 of 0.19 µg/vial for one E. eluta population and LC50s between 0.41 and 3.51 µg/vial for five E. stigmatias populations. Additional laboratory experiments included topical assays in a spray booth with commercial formulations of registered and non-registered insecticides with potential activity against corn silk flies.