Hunting for Hornets

I was fortunate to be invited on a Hornet Hunt by the Lundy Warden when I was over there last week.

Dean Jones, the Warden, had found some empty chrysalis cases on old Willow trees in the Quarries on Lundy.  He identified them as potentially Lunar Hornet Moth (Sesia bembeciformis) cases and ordered the newly released Pheronome for that species.   

Two of the empty chrysalis cases in Willow

Eggs are laid in the bark of Willow trees which hatch, and the larvae burrow deep into the wood.  In early June or July the white grub like caterpillars, and emerge from the chrysalis which are left half in the hole they bored.  The usually takes place around 8:30am early in June so we were probably a month and 5 hours too late. The cycle of mating and egg-laying then repeats.

We had hoped for a quick response to the pheronome order and, within the limitations of thrice-weekly sailings of the island's transport, MS Oldenburg it arrived before I left.  But, only just.  The day before I was due to leave, Dean asked if I was up for a visit with the lure to the site.

Dean and Rosie waiting expectantly

Dean, Rosie the Ranger and I duly set off north from the village to the 1860s quarry workings and to the site of the emergent moths.  Pheronomes are detected by male moths from at least 100 metres distant so we gave it half-an-hour but with no response.

Empty chrysalis extracted from Willow (0.5cm squares)

A few hundred metres south was another stand of Willow, but there were no chrysalises there.  We tried again but still with no success.

Nevertheless, we had tried and we did find at least half-a-dozen emergent cases at the original site but probably had missed the adult moths by a few days.  

Maybe next year when a picture of the spectacular adult might be available.

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Two Transects

For the first two weeks in July I was on Lundy.  While I was there I undertook two weekly butterfly transects for UKBMS.  I established this transect in 2019 to cover as diverse a selection of habitats as possible on the island.  

From the pond in Millcombe, the route ascends under trees and shrubs to Millcombe House then loops around the gorse covered slopes of Hangman's Hill and back under the trees to the head of the valley.  From here is follows a level route along the edge of the arable farm fields above the bracken covered sea cliffs to the beginning of the Quarries.

Towards the end of the Lundy Transect near Quarry Cottages

By contrast on Tuesday, I completed week 16 of my local butterfly transect - the Tidna Transet.  It begins and ends conveniently at my local, the Bush Inn and continues for half its length following the Tidna through its wooded valley and emerges at the edge of the Atlantic before climbing flowered covered cliff and returns along a Cornish hedged lane to complete the circuit.

Tidna Valley look inland from the Atlantic Clifftop

Both transects are within 20 miles of each other separated only by the Atlantic Ocean and Bristol Channel and cover broadly similar habitats.

I did my first Lundy transect on the 10th July on a really hot day only affected by a stiff North-west breeze although we were shielded from it by the field walls on the eastern side of the island.  Butterflies were recorded in each of the nine sectors with a total of 71 butterflies of seven species seen.  These were Small and Green-veined White, Red Admiral, Grayling, Meadow Brown, Ringlet and Small Heath.  On the second transect on the 15th, the weather was poorer resulting in fewer butterflies and only five species.

Small Pearl-bordered Fritillary - Tidna Transect

By contrast, my local transect, on the 21st July was in very hot weather with clear skies and hardly any wind.  Here also, butterflies were recorded in all ten sectors with a total of 155 butterflies of 14 species.  The species recorded were; Large, Small and Green-veined White, Red Admiral, Small Tortoiseshell, Peacock, Comma, Small Pearl-bordered and Silver-washed Fritillaries, Speckled Wood, Gatekeeper, Meadow Brown, Ringlet and Small Heath.

Silver-washed Fritillary - Tidna Transect

With a few exceptions, both transects resulted in very similar species.  It was a little early for Gatekeeper, Speckled Wood is rare on Lundy and the Fritillaries have never been recorded.

A Lundy Grayling

I am jealous of the sighting of the Grayling though.  I have not yet seen one here on the mainland, but continue to be hopeful.

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Mary Atkinson Wild