On some leaves of various Hazels (Corylus), leaf miners have been burrowing. I have never seen these forms where they create blisters rather than small mined tunnels in the leaf. It is the grub or larva of a moth Phyllonorycter coryli. If you want to identify any British leafminers go here.
Each blister holds a grub which can just be seen in the blisters.
18th September 2009
18th September 2008
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