16mm Nut-tree Tussock larva on oak.

16mm Nut-tree Tussock larva on oak.

Observation - 16mm Nut-tree Tussock larva on oak. - UK and Ireland. Description: 2 pics added from Sat 24th Aug, 2 days after first viewing this larva. Before leaving the small oak where the cat. was found on Thursday 22nd, I noticed the larva had begun to spin a silken structure on the underside of one of the leaves. On Sat 24th when

2 pics added from Sat 24th Aug, 2 days after first viewing this larva. Before leaving the small oak where the cat. was found on Thursday 22nd, I noticed the larva had begun to spin a silken structure on the underside of one of the leaves. On Sat 24th when I looked there again, the larva had enclosed itself in what appears to be a puparia constructed by fastening two oak leaves together. The cat began this work immediately after I had disturbed it to take its photo on the roof of the car where the light was better.

If it pupates at 16mm as a response to being threatened, it will result in a very small moth? Is this likely to be what it is doing? Maybe it is temporarily protecting itself, I plan to keep an eye on developments.

Edit- 10th Sept 13, the larva has vacated the original dwelling it constructed leaving a visible ring where that was. It now appears to be relocated in a similar structure between two leaves a bit lower on the same branch. 2 more pics added.

Edit- 15th Sept, the larva appears to have pupated and gone. Larval remnants found today. It was an early instar larva and it has pupated at a peculiar time of year possibly as a result of being threatened. The adult is usually on the wing in this region in May and June.