I'm not sure what did the damage, I couldn't find anything among the frass or inside, but I think whatever it was, it's an opportunist bug of some kind rather than a serious specific pest of quince. I'll need to keep an eye out for it, as even this small amount of external damage will rapidly turn to brown rot in store.
Thursday, 22 September 2011
Frass on Quince
I noticed lots of insect frass on the calyces of a couple of quince this year. Quince are famous for having few pests or diseases, so I was a bit annoyed to find this as well as quite a lot of scab. However, on close inspection the damage is mainly on the exterior, extending only a little way into the fruit at the calyx end.