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#1 2013-04-10 01:10:55

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Ptychoptera larva?

While searching ineffectively yesterday for Eristalis larvae in a hedge ditch, I found several larvae like the one shown.  Is this a Ptychoptera larva?  It is 46 mm long from head to tip of posterior spiracle.

Where do Eristalis pupate?  Do the larvae leave the wet organic matter?  Is this perhaps why I cannot find any now? And what do the pupae/puparia look like?  I would welcome any advice on this.

Regards

Rob Wolton


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Last edited by RobWolton (2013-04-10 01:11:38)

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#2 2013-04-11 12:15:24

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 830

Re: Ptychoptera larva?

Yes, that's Ptychoptera.
Picture of Eristalis puparium at http://entnemdept.ufl.edu/creatures/liv … maggot.htm
They do leave to pupariate in drier conditions, though usually not far from the larval habitat. Remember that some (all?) Eristalis species overwinter as adults, so don't rely on overwintering larvae to survive.

Last edited by Tony Irwin (2013-04-11 12:15:43)

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#3 2013-04-11 13:17:37

RobWolton
Committee
Name: Rob Wolton
Registered: 2009-08-13
Posts: 114

Re: Ptychoptera larva?

Many thanks, Tony.  That's a most useful webpage on Eristalis.  I shall have to resume my search for rat-tailed maggots in the middle of the summer - as you say, the various species that are common on the farm may all be surviving overwinter as adults.  Best wishes, Rob

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