Using Red Panel Traps to Detect Spotted-Wing Drosophila and its Infestation in US Berry and Cherry Crops

Abstract

Spotted-wing drosophila (SWD), Drosophila suzukii Matsumura (Diptera: Drosophilidae), is an invasive pest of thin-skinned fruits in the United States. Monitoring traps are an integral part of SWD integrated pest management, allowing early detection and timely management of this pest. An ideal monitoring trap should be easy to use, effective in capturing SWD, sensitive and selective to male SWD which are easy to identify due to their spotted wings, and able to predict fruit infestation from trap captures. Deli-cup-based liquid traps (grower standard), which make in-situ observations difficult, were compared with red-panel sticky traps, both baited with commercial lures (Scentry, Trécé Broad-Spectrum (BS), and Trécé High-Specificity (HS)), across several US states in blueberries (lowbush and highbush), blackberry, raspberry, and cherry crops during 2018 and 2021. Results showed that red-panel traps effectively captured SWD, were able to detect male SWD early in the season while also being selective to male SWD all season-long, and in some cases linearly related male SWD trap captures with fruit infestation. Scentry and Trécé BS lures captured similar numbers of SWD, though Trécé BS and Trécé HS were more selective for male SWD in red panel traps than liquid traps in some cases. In conclusion, due to its ease of use with less processing time, red-panel traps are promising tools for detecting and identifying male SWD in-situ and for predicting fruit infestation. However, further research is needed to refine the trap captures and fruit infestation relationship and elucidate the trap-lure interactions in berry and cherry crops.

Optimizing a rapid LAMP assay for discrimination of Drosophila suzukii (Diptera: Drosophilidae) from common drosophilids captured in monitoring traps from the Midwest, United States

“…Sprays may be applied on a calendar-based schedule (i.e., every 7–10 days), based on detection of D. suzukii adults in baited, liquid-based monitoring traps or baited sticky-panel traps. Researchers continue efforts to improve the attractiveness and efficacy of D. suzukii baits and traps to monitor adult activity, including odor, shape, and color (Lee et al 2012, 2013, Iglesias et al 2014, Kirkpatrick et al 2017, 2018, Lasa et al 2017, Panthi et al 2022). However, a trap system that is specific to D. suzukii has yet to be developed (Larson et al 2021); consequently, other drosophilids and non-target insects are attracted and captured in monitoring traps, resulting in large volumes of trap catch that must be sorted and visually searched for the presence of D. suzukii .…”

Vacuum extraction: an effective larval sampling method for spotted-wing drosophila in small fruit crops

“…Many of the attractants developed, especially those developed earlier, were nonspecific, which resulted in substantial nontarget capture, challenging D. suzukii pest identification from trap catches for nonexperts (Lee et al 2012, Iglesias et al 2014, Burrack et al 2015). Since then, attractants that are more specific to D. suzukii and trap designs that are easier to deploy in the field have been identified and have become commercially available (Frewin et al 2017, Panthi et al 2022). While recent research indicates some correlation between trap capture and larval fruit infestations, trap captures are not entirely reliable in accurately predicting D. suzukii fruit infestation (Burrack et al 2015, Drummond et al 2019).…”

“…While recent research indicates some correlation between trap capture and larval fruit infestations, trap captures are not entirely reliable in accurately predicting D. suzukii fruit infestation (Burrack et al 2015, Drummond et al 2019). Moreover, trap efficacy, sensitivity, and selectivity can vary across the trap designs and attractants, the sampling years, growing seasons, crop types, and host fruit availability levels (Jaffe et al 2018, Cloonan et al 2019, Harmon et al 2019, Singh et al 2020, Panthi et al 2022). Due to these reasons, some fruit-growing regions largely abandoned trap monitoring as a tool to make management decisions during the season (Tait et al 2021).…”