Is this the feeding damage of Donacia dentata?

Posted by Graeme Lyons , Saturday, 12 August 2017 08:53

If you want to find invertebrates that specialise in feeding on only one plant, then it's a good idea to look at areas that have LOTS of that plant. So when I was out surveying ditch plants at Amberley Wildbrooks last week, I spotted a lot of Arrowhead in one ditch. Now this is the only place I have ever seen the scarce Donacia dentata and then only ever once. Try as I might I could not find any reed beetles on this particular patch of Arrowhead but I did notice these feeding signs. Now, is this likely to be Donacia dentata and if so, is it enough to make a record?

17/08/2017 UPDATE: Clive Turner via Facebook has confirmed this is the case.

Lots of Anthocomus rufus everywhere at the moment. Even had one on the office door at Southerham, a chalk-grassland site, far away from its wetland habitat!

Amberley has incredibly varied soil types, I was working on the more acidic areas last week. There the sandy ditch-slubbings are a brilliant home for Green Tiger Beetle burrows once consolidated, here at a greater density than I have ever seen before.

Some of the ditches here are looking AMAZING. really wide with a gently sloping shelf-like profile and a messy edge. Full of flowers and insects everywhere!

The one species that I had not seen before was this gall on Nettle caused by the fly Dasineura urticae. Also new to the entire reserve network.

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