pun_logo

The Society for the study of flies (Diptera)

Affiliated to the British Entomological and Natural History Society (BENHS)

You are not logged in.

#1 2018-04-15 09:44:56

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 944

Chloropidae on Cuckoo Pint leaves

I have submitting this for 2 reasons. I'm fairly sure this is Thaumatomyia notata, but if somebody thinks this is wrong or doubtful, then please say.
Also I would have expected it to be on grass, or is that simplistic? It was nearly all the time on Cuckoo Pint leaves, sometimes examining (or eating) some vague yellow lumps on the surface. Mostly these would be almost too small to notice, but I see in text on this species that it feeds on excretions of Chrysomelidae larvae. I would not have expected Chrysomelidae on Cuckoo Pint. I have never noticed any larvae or beetles on Cuckoo Pint before. Am I being simplistic again?

Nigel G.


Uploaded Images

Offline

 

#2 2018-04-15 17:26:39

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 688

Re: Chloropidae on Cuckoo Pint leaves

I'd agree that this is Thaumatomyia notata, but I'd say that the yellow lumps are more likely Puccinia sessilis (Arum rust).  Not sure whether this is normally in their diet. As predators of root aphids in the larval stage, they have no particular association with grass, AFAIK.

Offline

 

#3 2018-04-15 18:06:31

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 944

Re: Chloropidae on Cuckoo Pint leaves

Thanks Tony.

I'm sure the fly was repeatedly stopping at these minute yellow spots, which I had not noticed before - too small to see unless using a magnifying glass or camera. I shall have a look at one under my microscope and see if it looks like said rust species.

Nature never ceases to amaze me. I find one thing, and generally it connects to something else, and so on. It's a bit like opening up a Russian doll, and finding that there is always something else to follow on from that ... another subject to open.
smile

Nigel G.

Offline

 

#4 2018-04-17 09:38:40

Alan Outen
DF Members
Name: Alan Outen
Registered: 2010-06-24
Posts: 812

Re: Chloropidae on Cuckoo Pint leaves

The yellow is indeed the rust fungus Puccinia sessilis. It is common on Cuckoo Pint at this time of year, particularly near water as it host alternates with Phalaris arundinacea.

Alan

Last edited by Alan Outen (2018-04-17 09:39:22)

Offline

 

#5 2018-04-17 12:12:33

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 944

Re: Chloropidae on Cuckoo Pint leaves

Thanks Alan.

Yes, said Cuckoo Pint about 5 metres from a slow stream.

I looked at some sample leaves with yellow speckles, and mostly they are barely visible with the naked eye. Checked to x45 with microscope, and it looks like, compared with images on the web, they have not reached a mature stage, since they are only blisters, not forming cup-shaped structures.

Nigel G.

Offline

 

Board footer

Powered by PunBB
© Copyright 2002–2005 Rickard Andersson