Here in France we are bothered by Asian hornets which are more aggressive than the local ones, and also eat the bees. I can handle the nests which are lower down. Early in the morning when the hornets are dozy I put a rag soaked in white spirit on the nest with a long pole. After a couple of minutes I put a lighted rag on it and stand well back. White spirit not petrol. This method has proved effective.
The nest in the photo was 40 feet up in an acacia tree and I had to get the local nest destroyer in.
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