Purple Emperor males roost high up in trees and are highly vulnerable to gales, especially at night. This season, we had night gales on June 28th and 29th, and then three days and nights of strong winds around July 3rd and 4th. The females seem to roost lower down and so be less vulnerable.
As yesterday was cloudy, I don't yet know how much damage has been done but suspect that it is considerable (possibly two-thirds of the male population killed off?).
Consequently, I would advise against people driving long distances to see the butterfly, especially to Knepp which is an exposed site.
The weather forecasts suggest that I'll be able to assess the damage at Knepp on Friday. I'll report back...
We'v been lucky, in that we've had a long run of good-weather Emperor seasons... Purple Hairstreak numbers have also been depleted and at Knepp, at least, the poor White-letter Hairstreak has had a shocker.
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