Horse Chestnut Leaf Miner Trap
The Horse Chestnut Leaf Miner Trap helps preserve that bastion of the English countryside, the horse chestnut tree, from leaf miners which burrow into the tree's leaves and cause untold damage - including a reduction in conker size
The Horse Chestnut Leaf Miner Trap helps preserve that bastion of the English countryside, the horse chestnut tree, from leaf miners which burrow into the tree's leaves and cause untold damage - including a reduction in conker size.
The horse chestnut miner trap trap uses a pheromone to lure and catch adult moths and drastically reduces the population, leaving females unfertilised and far fewer eggs which hatch into the leaf miner or caterpillar. Simply add the pheromone to the robust and weather protected conker tree miner trap and hang in the tree in April, remembering to clear the leaf miner trap out and replace the pheromone lure every 6 weeks between April and August. Choose either the trap with a single lure or the trap with 3 lures which will cover the whole period. Replacement lures are also available separately in packs of 5.
The results should be fairly evident and you can enjoy collecting large conkers from your valuable horse chestnut trees for years to come!
- Horse Chestnut Leaf Miner Trap available as a single lure trap or supplied with a pack of 3 lures
- Replacement lures are available separately in packs of 5
- 3 pack and trap package covers the recommended protection period from April to August
- Trap uses a pheromone to attract and catch male adult moths
- Reduction in male moth population indirectly affects eggs laid and leaf miner numbers
- Trap is simply laced with pheromone and hung in tree
- Replace lure and clear out trap every 6 weeks between April and August
- Leaf miners are widespread in the south of England and present in much of the country
- Affected trees look sickly, suffer from premature leaf browning and drop and conker size is reduced
- Trap will not totally eradicate pest but use over years will drastically reduce damage
- Lures can be stored for up to 2 years if left in aluminium sachet unopened. It is recommended to store lures in the freezer.
We are just outside Newark in Nottinghamshire which demonstrates how far up country this leaf miner has got, I am sure it is further North than we are.I have 3 Horse chestnuts in our garden with 3 more in next door's. I placed a trap in each of my trees but unfortunately next door have little desire to treat their trees (or spend the cost of 3 traps plus refill lures for the season) so I am always going to have a battle trying to reduce the effect in my trees while theirs next door are going at it full tilt. Last year (2015) was the first I used this trap, one per tree and the number of insects caught was astonishing and the leaves only went into full melt down in September when before, the moth has caused the leaves to brown and fall in late July/August so some success despite the odds being against me. This year 2016 I am trying an extra trap placed nearer our neighbours in the hope of cutting down any "invasion from over the fence". It is not a complete cure and I am expecting brown spots will appear but not in the profusion seen in previous years and the leaf fall is delayed somewhat. We were pleased that the trees remained 'green' for a lot longer than previous years but dismayed that this is a relentless battle and the traps are a partial cure. One strange quirk in 2015 is that in July all 3 traps were full of dead bluebottles (flies) and the stench to clean them out was horrendous. I can only assume the lures attract bluebottles as well but not a pleasant task to clean out. Lets see if 4 traps are better than 3 this year. I've a sneaky feeling that more traps spaced closer than recommended may be needed but as this is not a total cure (and I have next door to contend with) I have to ask is it worth any more traps than I already have? Most probably not. Definitely worth using the traps to delay the eventual leaf browning and fall but don't expect a complete cure or success.
Many thanks for your comments which we greatly appreciate. Traps will not totally eradicate the pests but use over years should drastically reduce damage.
First time user of the traps. Placed one as soon as it arrived which was perhaps a bit late 14th May. Then couple of weeks later another. First one seems to be working well. Second not so well so have replaced it same distance from leaves. I know the second one has had less time to do its job but there is a big difference in numbers trapped. 1st has an uncountable mass larger than a 2p. 2nd trap I could count - hardly any! Therefore mixed opinion. Tree already very blotchy - looks like a bad year.
I used this for the first time in 2013, starting In late May and renewing the lure after 6 weeks. Very large numbers of moths were caught but the trees still ended-up looking very ragged. This year I baited the trap on 21st April and was a bit horrified to find that huge numbers of moths were around already. At the moment the jury here is still out on how effective the trap really is but perhaps I started too late last year. The cost of the replacement lures is a bit ridiculous; the cost of the three lures you need for a season works out more than the cost of a trap with three lures.
Horse Chestnut Leaf Miner Traps
Get more from your leaf miner trap by understanding the lifecycle of the pest and the optimum time to introduce the trap with our handy guide...
Horse Chestnut Leaf Miner (Cameraria ohridella) damage on Horse Chestnut trees is becoming a common problem in Southern England and is spreading into other areas.
The adult moths lay hundreds of eggs, which develop into caterpillars that drill into the Horse Chestnut tree leaves. This causes the leaves to dry up and turn brown, gives the tree a very sickly appearance and leads to early leaf fall, reduced seed vigour and poor germination. The damage is not fatal to the tree but one effect is the reduction in the size of the conkers from infested trees.
How The Trap Works
The Horse Chestnut Leaf Miner Trap contains a pheromone lure that attracts male Horse Chestnut Leaf Miner adults in huge numbers into the trap. Here they are caught and perish which reduces mating leading to reduced egg laying. The traps do not totally stop damage or 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.
The adult moths are up to 5mm in length and are a metallic chestnut brown with white stripes edged in a black stripe. They appear from April, most from overwintered pupae in leaf litter. There can be 3-5 generations per year depending on the weather. Eggs are laid on leaves from May to August in large numbers and hatch in 2-3 weeks. The Horse Chestnut Leaf Miner larvae develop in about 4 weeks inside the leaf tissue.
How to use the Horse Chestnut Leaf Miner Trap
Before placing the trap in the Horse Chestnut tree, add the Cameraria ohridella pheromone lure into the top of the castellation trap. A small amount of water with detergent can also be added to the trap to ensure adults do not escape. Hang one trap per tree by April. Each pheromone lure will last about 6 weeks; after this period, remove the trap and empty its contents before adding a fresh lure and replacing in the tree. This process should be repeated at least 3 times from April to the end of August to ensure that new generations of Horse Chestnut leaf miners are caught.
In the Autumn the traps can be removed, cleaned and stored for use the following season. It is recommended that the traps are used each year to reduce numbers and damage.
It's also important to remove leaf litter in autumn and burn as this will significantly reduce the amount of overwintering Horse Chestnut leaf miner pupae.