I brought my olive tree inside from the balcony. After 2 weeks leaves started dropping off like crazy. At first I thought it was the shock of moving it, but I found that there was a lot of clumped up spider web like residue on the leaves and they had grown in distorted ways.
Location: London, UK
However, I also found this caterpillar inside one of the curled up leaves. Could it have been caterpillars laying eggs and growing in the leaves that caused all the damage? How might it have arrived on my 2nd floor balcony?