On willow by reedbed
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Don't suppose you collected the specimen, did you? The yellow growths on the rear of the elytra look like the laboulbeniales fungus Hesperomyces virescens, a sexually-transmitted fungal disease. I'd need to check the literature properly, but I can't find any mention of it infecting C. renipustulatus
Record your ladybird sightings!
No specimens collected I'm afraid... however, I'll no doubt visit the site again, next time with a collecting tube...
I'll post a blog about it though and see if anyone else has seen it on this species.
It's definitely worth keeping an eye out for - this looks to be quite a light infestation but sometimes it can cover the entire ladybird! If any more comes to light, all specimens will be gratefully recieved by the ladybird survey!
I had a look on the site today but couldn't find any (not even the ladybirds with or without fungi) but I've asked the site manager to keep an eye out...
Lat/Lng: 51.0, -1.4
OS grid ref: SU4830