My one year old blackberry is showing signs of insect damage by the way of leafs that have been eaten. However, I can find no trace of the insect. Also some of my leaves have brown spotting, while others are browning and curling. Strangest of all, a few leafs appear to have been eaten, but only at the center bottom of the midrib towards the petiole. There is a hole in this location, and a brown mass adjacent to the whole, almost like a tumor...

Any ideas on what could be bugging my berry?

Thanks!

Heather