Sticky trap pattern size for thrips spatial vision
Data files
Apr 08, 2025 version files 59.73 KB
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2024_Final_stim_size.R
31.12 KB
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Lab_stimuli_size.R
21.43 KB
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README.md
1.98 KB
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Stim_size.csv
2.35 KB
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Thrip_Data_R.csv
2.86 KB
Abstract
Colored sticky traps are used for the management of many common agricultural insect pests. Several recent studies have shown that traps can be improved by systematically considering properties of color vision for the intended target species. In the current study, we extend this approach to spatial vision, using information about the interommatidial angle of an agriculturally important insect pest, western flower thrips (WFT) Frankliniella occidentalis (Pergande), to predict the spatial resolution capabilities for a yellow flower pattern across a range of viewing distances. We tested the hypothesis that pattern sizes matching the spatial resolution capabilities of WFT at a given viewing distance would outperform traps with mismatched pattern sizes by measuring the number of WFT caught on sticky traps containing differently sized flower patterns resolvable at either 5, 10, or 20 cm, respectively. We found an interaction between pattern size and viewing distance on WFT catch, with significantly more WFT caught on traps when the predicted resolvable distance of the pattern matched the distance traps were placed from a central release point. We further tested the range over which trap patterns are effective in more complex viewing environments using commercial polytunnels. In polytunnel trials, we found that increasing the distance over which patterns are resolvable increased WFT capture up to approximately 26 cm, after which WFT capture decreased up to the maximal visible range tested (50 cm) in the absence of additional sensory cues. Together, these results show the utility of considering spatial vision in improving trap performance and offer functional insights to improve pest management in visual trap design.
https://doi.org/10.5061/dryad.1zcrjdg2x
Description of the data and file structure
Number of thrips caught on sticky traps with different-sized flower patterns in lab and field conditions.
Laboratory study: Approximately 50 adult thrips were released from the center of an enclosed arena containing sticky traps. After 2 hours, traps were collected, and the number of thrips on each trap was counted.
Field study: Sticky traps were hung at different heights above the crop canopy and left for 48 hours. Traps were collected after this period, and the number of thrips counted.
Files and variables
File: Thrip_Data_R.csv
Description:
Variables
- Position: randomized position within the experimental arena (A, B, or C)
- Count: number of thrips on each trap
- Distance: distance traps were placed from the release point in cm
- Size: stimuli pattern size (S = small, M = Medium, or L = large)
- Trial_N: trial number
- Temp_in: temperature inside greenhouse in degrees Celsius
- Temp_out: outside temperature in degrees Celsius
File: 2024_Final_stim_size.R
R code for field trials (Stim_size.csv)
File: Stim_size.csv
Description:
Variables
- Stimuli: Combination of stimuli size (S, M, L) and height above crop canopy that trap was hung in cm
- Size: pattern size (S, M, L)
- Height: height above crop canopy trap was hung in cm
- Vis: calculated visible range when the trap was visible from positions adjacent to the trap location in cm
- Tunnel: pollytunnel where trials took place (1, 2, or 3)
- Row: crop row where the trap was placed (1 or 2)
- Count_WFT: number of thrips caught
- Count_GWF: number of greenhouse whitefly caught
File: Lab_stimuli_size.R
Data analysis code for laboratory trials (Thrip_Data_R.csv)
Code/software
Excel for .csv files and R (2024.09.0+375) for analysis files.