I always keep the larvae in the open so that they are exposed to the elements, the only artificial factor is that my Sallow bush is enclosed in netting which reduces the wind chill factor somewhat. I have been doing this for 30 years and I have noticed that the home bred specimens emerge on average about one week earlier than those 'in the wild'.
This year seems different however. Of the seven which I have, three pupated between the 15th and 17th of June and the last four pupated while I have been away between the 19th and 22nd, suggesting emergences between about the 5th and 12th of July, which is certainly late for home bred specimens.
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