Vigilance is definitely the key. My Englemann's Ivy 2 years ago started to be eaten and its growth was stunted. In the fall it didn't even turn red. Last year I saw small brown worms on the undersides of damaged leaves, but at that point the whole ivy looked eaten. This year I inspected early in the spring and found small black beetles, which I picked off regularly for about 2 weeks. After that I pruned off holey leaves (many with worms underneath). It appears that the ivy has recuperated this season with lots of new growth and comparatively little leaf damage. Definitely worth the labor.
Vigilance is definitely the key. My Englemann's Ivy 2 years ago started to be eaten and its growth was stunted. In the fall it didn't even turn red. Last year I saw small brown worms on the undersides of damaged leaves, but at that point the whole ivy looked eaten. This year I inspected early in the spring and found small black beetles, which I picked off regularly for about 2 weeks. After that I pruned off holey leaves (many with worms underneath). It appears that the ivy has recuperated this season with lots of new growth and comparatively little leaf damage. Definitely worth the labor.