| Autor: |
Schwan Resende, Eric, Beuzelin, Julien M, Dunkley, Victoria E, Paula-Moraes, Silvana V, Seal, Dakshina R, Nuessly, Gregg S |
| Zdroj: |
Journal of Economic Entomology; October 2022, Vol. 115 Issue: 5 p1685-1692, 8p |
| Abstrakt: |
Picture-winged flies (Diptera: Ulidiidae) are the most damaging insect pests of sweet corn (Zea maysL.) produced in Florida for the fresh market. Management of these pests, referred to as corn silk flies, relies on frequent pyrethroid applications targeting adults. In response to the need for an insecticide resistance management (IRM) program for corn silk flies in this highly intensive crop system, glass vial bioassays were conducted to determine the susceptibility of 12 corn silk fly populations to the pyrethroid beta-cyfluthrin. Two Euxesta elutaLoew and nine Euxesta stigmatiasLoew populations were obtained by collecting infested ears in commercial and experimental fields in 2020 and 2021. One E. elutalaboratory colony was used as a susceptible reference population. The E. elutareference colony was the most susceptible population, with an LC50value of 0.01 µg/vial. The E. stigmatiasfield populations were generally less susceptible to beta-cyfluthrin than the E. elutafield populations, with the highest LC50values attaining 3.51 µg/vial and 0.19 µg/vial, respectively. In addition, the five E. stigmatiaspopulations from commercial sweet corn fields were as much as 17.6 times less susceptible than the four E. stigmatiaspopulations from nontreated fields. Results suggest that E. stigmatiasis less susceptible to pyrethroids than E. eluta. Results also suggest that corn silk flies in commercial sweet corn fields are selected for reduced pyrethroid susceptibility throughout the growing season. This study successfully used the glass vial bioassay method for corn silk flies, providing a new tool to initiate an IRM program. |
| Databáze: |
Supplemental Index |
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