Please help to identify blackberry disease/pest. Its all started in June, when i noticed that someone eating the leafs. From other side, leaf have some kind of web or funnel. I used insecticide which you can see on a picture, but I don’t really know , if there is any effect. Also some leafs became rusty and dry. Is it mean that plant will never recover again? Thanks for your help in advance!
Can you give some more information like where you are/what your climate is like, and the growing conditions for the blackberry? From the photos it looks like the plant is indoors?
In my area (Western Oregon), blackberries are extraordinarily hardy and have very few pest problems. One good thing to keep in mind is that they will grow new canes every year, and year old canes will die back after they fruit. So, as long as the plant has the chance to photosynthesize and store up some energy, it should continue to survive and grow.