Feijoa fruit problems

talita starts with ...
We have two feijoa trees both fruited for the first time this year, they are approximately 3 years old. We have had a lot of fruit from both trees, but they have fallen unripe from the trees and are brownish inside. Some that have been close to ripe are quite dry inside and do not have the soft jelly consistency I think they should have. As from the photos you can see that we have some sort of bug problem as well? Any ideas on what might be causing the is?? Thanks!