Mid August 2022
A brief visit to Thorpe Marshes began with an interesting gall on Walnut. As well as the usual blister galls caused by Aceria erinea I noticed some small pimple galls caused by Aceria tristriata. There are no records of this latter species on the county database or in the two books about Norfolk galls, although I found out that it has been seen before in Norfolk - I've written a bit about this for the next NNNS "Natterjack".
Looking into one of the pathside ditches I noticed a Water Scorpion. On closer inspection it had just caught a Pond Skater, which I manged to get good enough pictures of to confirm as Gerris lacustris. There were two particular highlights of the visit, firstly a new sawfly for me, Tenthredo omissa (previously recorded here by Vanna Bartlett). The second was Tasteless Water Pepper, Persicaria mitis. I had seen water pepper here before, but something about it looked a bit different to usual, and as it didn't taste peppery I checked a bit with Jo Parmenter, who was able to confirm it was the much scarcer alternative species. Two Dasysyrphus tricinctus hoverflies were also of note - I have seen this species before, but only at this site.
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