L'Auto-vélo : automobilisme, cyclisme, athlétisme, yachting, aérostation, escrime, hippisme / dir. Henri Desgranges

30 décembre 19251925/12/30 (A26,N9146)

Mean (± SE) percentage of flies that escaped from different trap models in 30 minutes.

<p>(a) comparison between dome-shaped and flat lids in a colorless transparent cup trap and (b) comparison between red colored cup trap with a dome lid and an additional tube device and a similar red cup trap with a flat lid. As flies were initially placed inside traps, the observations were performed using traps without lures.</p

Trap model developed for use in experiments.

<p>(a) lateral section (b) frontal section of the trap design and (c) photograph of the trap. This trap was constructed with a red opaque cup and black horizontal stripe (1) fitted with a transparent dome-shaped lid (2) in which an additional tube device (3) was inserted through the upper opening of the dome lid. The cup was baited with an attractant drowning solution (8) and the additional device was baited with a complementary attractant (7), which was a sugar-yeast mixture in the present study. The additional tube device was closed with a plastic screw-top (5) that fitted precisely in the upper opening of the dome lid and prevented the escape of flies from inside the trap. Volatiles from the additional device passed through a nylon mesh 0.2 mm (4), mixed with drowning solution volatiles in the internal cup space and were released through lateral access holes (6). This model trap was called “2C-Trap” when baited with ACV + 10% ethanol as the drowning solution and with a sugar- yeast mixture in the additional tube device.</p

Efficacy of different trap models of trap tested against <i>Drosophila suzukii</i> flies in three independent tests developed under laboratory cage conditions.

<p>The red-black stripe trap D was used as the reference trap in all tests. Test 1: stimuli of small circular or vertical red-black bands in colorless cup traps A-D; Test 2: inclusion of yellow circles or bands on red-black stripe traps E-D; Test 3: contrasting color effects using transparent or colored dome shaped lids that improved headspace between the access holes in red-black stripe traps H-D. Columns labelled with the same letter were not significantly different for comparisons of responses of each sex or total captures in each experiment (Tukey HSD test, P > 0.05).</p

Improved capture of <i>Drosophila suzukii</i> by a trap baited with two attractants in the same device - Fig 4

<p><b>Mean (± SE) numbers of <i>Drosophila suzukii</i> females and males trapped in two independent experiments (a, b).</b> Groups of 40 male and 40 female adults were released under cage conditions. Bars labelled with the same letter were not significantly different for comparisons of responses of each sex in each experiment (Tukey HSD test, P > 0.05).</p