13.4.4. Drone trap construction
For constructing a drone trap a modified design of a wind-directed pheromone trap of Williams (1987) has proved very effective (Fig. 35). It is constructed of white tulle for wedding veils which is supported by three wire rings of stainless steel.
- The diameter of the steel is 0.014 cm.
- The diameter of the rings are:
- 50 cm for the lowest ring
- 35 cm for the middle ring
- 29 cm for the top ring.
- The net dimensions are:
- 104 cm in height
- 50 cm at the bottom (encompassing the bottom ring)
- 22.5 cm at the top (encompassing the top ring).
- When sewn together, the shape is formed by the three steel rings and the top is closed by a disc of tulle.
- In the bottom ring and the middle ring a fishing line is fixed between two diametrically opposite points, with a small loop in the middle to fix the scented queen dummy at the DCA.
- It is advisable to use two dummies (each with 1 mg of 9ODA):
- one fixed at the lower diagonal fishing line – hanging on a 25-cm-long
- one fixed beneath the middle fishing line.
- To imitate drone pursuit, drone decoys are tied at the opposite sides of the bottom ring with a thread and the others are distributed at different places.
- If there are sudden gusts of wind, the trap may be blown into a horizontal position, and many drones may escape. To prevent too much movement, white cotton bead containing tiny lead balls (such as used for draperies) can be fixed at the bottom ring. Alternatively, a heavier (thicker) stainless steel wire can be used for the bottom ring.
Fig. 35. Drone trap equipped with scented and unscented dummies.