Products Cited in Publications Worldwide Novel sources of semiochemicals to manipulate spotted-wing drosophila behavior in blueberries

Novel sources of semiochemicals to manipulate spotted-wing drosophila behavior in blueberries

AMANDA QUADREL

DOI:

Abstract

Spotted-wing drosophila (SWD), Drosophila suzukii (Matsumura), is an invasive pest that causes severe damage to soft-skinned fruits including blueberries. Presently, the predominant method of control involves scheduled insecticide sprays, but the emergence of resistance poses a considerable challenge. As an alternative approach, my thesis focuses on researching the manipulation of SWD behavior using semiochemicals. First, I explored the use of elicitors of plant defenses and a crop sterilant to induce a defense response in blueberries against SWD or impede the growth of a mutualistic yeast. The aim was to render the fruits less attractive to the flies. Observations were recorded at intervals of 1, 3, 7, and 10 days post-treatment to assess any residual effects. Additionally, I investigated the impact of specific volatiles emitted from anthracnose-infected blueberries as potential repellents or oviposition deterrents for SWD. In semi-field and large field cage trials, neither elicitors nor a crop sterilant demonstrated a reduction in blueberry attractiveness or deterrence of oviposition. However, among 14 differentially emitted volatiles, nine compounds exhibited repellency in multiple-choice assays. In dual-choice assays, two of these volatiles displayed excellent repellency. These two compounds exhibited dose-dependent effects on behavior and antennal response, consistently diminishing attraction and oviposition in field studies. The findings presented in this thesis offer valuable insights for the further development of behavioral manipulation tactics to control SWD in blueberry fields.

Keywords

Drosophila suzukii ; volatiles ; behavioral manipulation ; elicitors ; anthracnose fruit rot

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