Dr Glynn Percival of Bartlett Tree Research Laboratory, who has also tested the traps, said: "I have found the traps to be easy to install and replace the pheromone. Preliminary results demonstrate the traps are good at anticipating leaf miner numbers and provide a degree of control". More tests are under way at RHS Harlow Carr gardens in Harrogate, North Yorkshire.
Dragonfli owner Julian Ives, who is supplying the traps, said: "The traps do not completely control horse chestnut leaf miner, but continued use of the traps over several seasons reduces the damage caused and can help to delay the early leaf fall caused by this pest."
Clearing and burning leaf litter and encouraging blue tits are other ways to control the pests.
Each pheromone lure will last for about six weeks. The traps cost £16-£18 and each contains three lures.