I find rearing leaf miners to be one of the most rewarding forms of mothing. From finding the mines, observing them and their inhabitants under a microscope, the challenge of rearing them through to adulthood (which can take several months) and finally the equally challenging task of photographing the tiny adults.
WHY BOTHER SEARCHING FOR AND REARING LEAF MINERS?
1. You will record many additional species to your area as a lot are are not attracted to light or only weakly so.
2. Identifying the species at the mining stage is often straight forward or at least it provides vital information for identifying the adult later on. Identifying the adult alone is often a job for experts - usually involving dissecting the moth.
3. Having successfully reared a moth it is often a perfect, unworn specimen which makes for a good photo opportunity.
4. Moths in traps, especially singletons don't tell us where they have bred. They may have travelled many miles. Finding mines gives a positive breeding record for a site.
5. Rearing miners gives an interesting insight in to their early stages such as which foodplants they use, what types of mines they create, where they pupate etc.
6. It keeps the mothing "season" going all year round often at times when moth traps can have disappointingly low catches.
THE FOUR MAIN GROUPS I REAR ARE:
Eriocrania, easy mines to find and rear but takes 9 or 10 months to do so and identifying the larvae isn't always straight forward.
Stigmellas, easy mines to find but rearing can be a bit hit and miss. Adults hyperactive and difficult to photograph.
Phyllonorycters, mines easy to find and can be very easy to rear. Adults can be difficult to photograph unless caught just after emergence.
Coleophoridae, cases often hard to find but generally easy to rear and photograph.
Perhaps the most useful guide for rearing ALL groups of leaf miners can be found here: https://bugtracks.wordpress.com/2016/05/17/bug-rearing-101/
It's written by Charley Eiseman who resides in the USA and is very user friendly and highly recommended.
Also, the UK leaf miners site has several articles on rearing leaf miners amongst their newsletters. January and February 2007 being particularly useful.
Useful literature on the subject is "Breeding Butterflies and Moths - a practical handbook for all European species" by Ekkehard Friedrich. It gives information on rearing all lepidoptera including micros and leaf miners.
Web sites such as UK Leaf miners, Dutch Leaf miners and UK Leaf miners on Facebook are invaluable - especially for identifying the mines in the first place (important!). The links to which are on my home page.
A FINAL WORD.
If you do go down the leaf miner rearing route you will have failures, you will be disappointed when out pops a parasitic wasp instead of a prized specimen. But trust me, you will have successes - plenty of them. And you will have delved in to a most fascinating, hidden world where the most beautiful and exciting creatures live. They are everywhere from the bleakest moors to your own back garden. Give it a go and tell me how right I am.
One species from each of the nine families I've had successes with.