Testing New Traps to Catch Male and Female Fruit Flies

Jim Crocker
28th June, 2024

Testing New Traps to Catch Male and Female Fruit Flies

This study compared the male-targeted Lynfield trap (left) with the female-targeted Biotrap (right), concluding that female-targeted traps are more effective for early-season detection of Ceratitis capitata, while male-targeted traps perform better for monitoring larger populations late in the season.

Image adapted from: Howse et al. / CC BY (Source)

Key Findings

  • The study in south-west Western Australia compared male-targeted and female-targeted traps for detecting Medfly populations in apple orchards
  • Male-targeted traps generally caught more Medflies overall, but female-targeted traps were more effective early in the season when populations were smaller
  • Using both trap types together is optimal: female-targeted traps for early detection and male-targeted traps for larger populations later in the season
Mediterranean fruit fly (Medfly) Ceratitis capitata (Wiedemann) is a significant global pest that affects various crops. Monitoring and managing this pest is crucial for maintaining the health and productivity of orchards. The Department of Primary Industries and Regional Development, Australia, conducted a study to compare the effectiveness of male-targeted and female-targeted traps in detecting Medfly populations in apple orchards over a two-year period[1]. The study aimed to determine which type of trap would be more effective for different stages of the Medfly population cycle. Male-targeted traps (Lynfield Trap with Trimedlure) and female-targeted traps (Biotrap Globe trap with the 3-component lure-TMA Plus) were deployed in apple orchards in south-west Western Australia from September 2019 to September 2021. The results showed that male-targeted traps generally caught more Medflies overall, but female-targeted traps were more effective early in the season when populations were smaller. This finding is critical because early detection of Medfly populations allows for timely intervention, potentially preventing larger infestations later in the season. Female-targeted traps were more likely to capture at least one fly when their paired male-targeted trap caught none, indicating their higher sensitivity during the early stages of population growth. Conversely, male-targeted traps performed better later in the season and were more likely to capture high numbers of Medflies. The study's results suggest that a combination of both trap types may be optimal for monitoring Medfly populations throughout the year. Early in the season, female-targeted traps can provide early warnings of emerging populations, while male-targeted traps can be more effective in detecting and quantifying larger populations later in the season. This study builds on previous research on pest detection and monitoring. For instance, a study on the gypsy moth (Lymantria dispar) used dynamic wind models and behavior simulations to understand the probabilities of capturing moths in traps[2]. Similar to the findings with Medfly, the study highlighted the challenges of detecting low-level populations, especially when traps have low efficiencies. This underscores the importance of using highly sensitive traps, like the female-targeted traps for Medfly, to improve early detection rates. Another relevant study investigated the action thresholds for the blueberry maggot fly (Rhagoletis mendax) and found that cumulative fly trap captures were significant predictors of fruit infestation levels[3]. This study emphasized the importance of understanding pest population dynamics and the effectiveness of different trapping methods in predicting and managing infestations. The Medfly study similarly highlights the need for targeted trapping strategies to manage pest populations effectively. Furthermore, research on the connectivity of urban ponds and its impact on Odonata communities (dragonflies and damselflies) demonstrated how landscape connectivity influences dispersal and population dynamics[4]. This concept of connectivity can be applied to the Medfly study by considering how the spatial arrangement of traps and the surrounding environment may affect trap effectiveness and pest detection rates. In conclusion, the study by the Department of Primary Industries and Regional Development, Australia, provides valuable insights into the optimal use of male-targeted and female-targeted traps for monitoring Medfly populations in apple orchards. By incorporating findings from previous studies on pest detection and population dynamics, this research highlights the importance of using a combination of trapping methods to ensure effective monitoring and management of pest populations throughout the year.

AgricultureEnvironmentAnimal Science

References

Main Study

1) Field evaluation of female- and male-targeted traps for Ceratitis capitata (Diptera: Tephritidae).

Published 27th June, 2024

https://doi.org/10.1093/jee/toae139

Related Studies

2) Simulation Modeling to Interpret the Captures of Moths in Pheromone-Baited Traps Used for Surveillance of Invasive Species: the Gypsy Moth as a Model Case.

Journal: Journal of chemical ecology, Issue: Vol 42, Issue 9, Sep 2016

3) Dispersal From Overwintering Sites, Action Thresholds for Blueberry Maggot Fly (Diptera: Tephritidae), and Factors That Can Influence Variation in Predicted Fruit Infestation Levels in Maine Wild Blueberry: Part I.

https://doi.org/10.1093/jee/toz333

4) Connectivity of stormwater ponds impacts Odonata abundance and species richness.

https://doi.org/10.1007/s10980-024-01817-z


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