A quick heads up to say that Purple Emperor larvae are developing rapidly in this fine spring. Some are already entering the final instar. That's very early...
As things stand, we can anticipate the flight season to start in (or even by) mid-June, and for it to be over by, say, July 21st.
I will post my official prediction for the start date in a week or so's time.
Expect, though, extreme weather at and around the time of Her Majesty's jubilee - given that the seven royal jubilees held to date have all generated extreme (and mainly bad) weather. That may delay the flight season.
Also, this could be an extremely good Emperor season, though much depends on weather during the pupation and pupal periods.
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