You may be relieved to read that iris is unlikely to produce a second brood here this year. The larvae I've been following at Knepp, some of which were in the 2nd instar before July 20th, haven't made much progress since then - in fact, they're still in the 2nd instar.
Here's a 2nd instar larva, with a seriously good isthmus (either side of his feeding), and the old egg case base (laid, unusually, on the leaf tip) -
Knepp Wildland suffered badly from drought. No rain fell there between May 31st and July 28th, when the Heavens opened. The young sallow thickets shed leaves copiously, especially the sub-canopy sprays which iris favours at this time of year. The population must have taken a fair hit, but after a massive egg lay. This is what I'm panicking about - these sprays are crucial to young larvae -
Finally, spot the 'master tree'. The leeward side of this clump of ten or so Scots Pines, in a wood near Lewes, E Sussex, is used by males each afternoon. Up to five have been seen in the air at a time. The clump is on a high point in the middle of the wood, and is quite well sheltered from the west by tall hornbeans (out of picture) -
Tuesday, August 14, 2018
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1 comment:
In the words of Corporal Jones " don't panic ! ".
Since they've cycled through massive population fluctuations over thousands of years since recolonising the land after the last Ice Age, they will no doubt continue to expand their range here.
Maybe 2019 will be see fewer emerge.
Irrelevant really.
Back to the woods !
regards
Mike
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