RHoman's picture

Galled (?) Runner Bean pod

Observed: 20th August 2012 By: RHomanRHoman’s reputation in InvertebratesRHoman’s reputation in InvertebratesRHoman’s reputation in InvertebratesRHoman’s reputation in InvertebratesRHoman’s reputation in Invertebrates
runner bean 1
runner bean 2
runner bean 3
Description:

Orange larvae found inside a runner bean pod, but not inside the bean itself. The area on the inside of the pod around the bean was covered with brown wart-like swellings which contrast with the normally smooth surface of the inside of the pod. Perhaps the orange larvae ans swellings indicate a cecid fly or is that 2 and 2 makes 5?

Identifications
Species interactions

No interactions present.

Comments

dejayM's picture

five

...for me (2&2=) Rob. I wish I could agree (and be right!) But I cannot, as in my meagre experience of disecting galls on Nettle, my ONLY experiece, suggsets that Cecid fly larvae are white. BUT your orange ones are much more likely to produce orange flies. And Mr Google Images suggests that some Cecid flies are orange, who could argue then?
Is it not the case that any 'pest' like this would invoke some disturbance on the outer skin on the pod - does this HAVE to be a gall?
There are a number of bean-pests of course.
Where does that leave your delightful post? Still in limbo, where it has already been for 2 years.
Why, you may ask, have I bothered you? Well the comment is now in My Track and I will get a flag each time someone contributes. They might now because this comment will produce a New flag which someone might notice.
The pictures are excellent, the post intriguing, exactly right for iSpot. I do hope someone comes.
derek

RHoman's picture

Cecid larvae

One of the main gall forming Cecid groups are the Dasineura species. These are invariably orange in colour especially when mature. Here are a couple of example:
http://www.bladmineerders.nl/gallen/diptera/dasineura/thomasiana/thomasi...

http://www.bladmineerders.nl/gallen/diptera/dasineura/hyperici/hyperici.htm

My suggestion that this was a galled bean pod is because of the odd swellings on the inner side, i.e an abnormal growth on the plant, perhaps caused by another organism.

Robert Homan