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It does sound fascinating a bit like an x-ray. Does the caustic potash only effect the lime leaf so it does't harm the larvae? It's amazing how people come up with these ideas in the first place.
I had alook at the British Plant Gall Society web pages - it looks as if it will be a useful resource in the future. A huge amount of work, time and money has to go into these things even when they have all the info' already. It will be well worth it in the end I am sure.
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