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Melanargia galathea
find out more... Marbled white butterfly Copyright: Sue Grayston

Essex Field Club
Essex Field Club
registered charity
no 1113963
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EFC Centre at Wat Tyler Country ParkWe are open today

We are normally open to the public at our centre at Wat Tyler Country Park every Saturday, Sunday and bank holiday 11am-4pm. We are also open on Wednesdays 10am-4pm.
Summer recording Record Goats-rue Record Wild Carrot
Record Spear Thistle
Record comb-footed spider
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Record Garden Spider Record Nigma walckenaeri spider

Rosemary Beetle

Chrysolina americana Copyright: Paul Mabbott
© Paul Mabbott
The Rosemary beetle, Chrysolina americana (Linn., 1758) (Chrysomelidae), has long been abundant in southern Europe but has only fairly recently established itself in Britain. It was first found in Weybridge, Surrey but its distribution now extends across that county and it survives happily in central London.  The process was summarised by A. N. Salisbury (Ent. mon. Mag.(2002), 138: 77-80) but since then it has spread into neighbouring counties.

It may not be long before it follows the footsteps of the Lily beetle and it would be interesting and useful to track its invasion and colonisation. The beetle is quite large (about 7mms long) and distinctively patterned in shiny, metallic colours with double rows of strong pits.  It feeds on rosemary, thyme and, especially, lavender; probably other labiates. It would be a minor pest in gardens but might pose a threat to the Norfolk fields.
See the results of your records
Chrysolina americana

Chrysolina americana-2 Copyright: Paul Mabbott
© Paul Mabbott
If you sight this beetle, please save your record here. There are other bright, metallic leaf beetles in Britain but the Rosemary Beetle should be easily identified by comparison to the photograph. If not, please send a sample to your local entomologist or Paul Mabbott: 49 Endowood Rd., Sheffield S7 2LY

We need the usual facts (where, when, how many) but as much other detail as possible: which plants, what habitat, activity etc.
Underlying map produced by MapMate®. Data overlay © Essex Field Club 2017.