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Here's a video we did last year for Autumnwatch looking at the difficulties our chestnut trees are facing. They're being attacked by the caterpillars belonging to a leaf-mining moth. Here's the blogpost I wrote at the time.

Well now we're updating the story. Researchers are hoping we can all help them to track these moths and see how far they've spread. You can do that via the website and now you can also do via a free app for your smartphone.

When you run the app you'll find a simple guide on how to use it. You take a photo of any damage, give it a "damage rating" and then confirm your location. In a few months scientists hope to have enough data to get a much better idea of how bad this problem is.

Search for "Conker Tree Science" or download the app direct by following these linkes, either from the or the