Photina robusta getting eaten

[Wal]

Hey all, not sure if I'm posting this in the right area but I've got a photinia robusta hedge which something is eating. Just wondering what the best chemical is to spray on them?
Also when should I prune them? I'm located in flinders ranges.

[Pam]

Are there many of the leaves affected? If not, I'd be more inclined to simply remove them and save the money. If you snip them off, leaving just a bit of the stalk they're attached to, they'll regrow again in no time.

It's not a concern that you mentioned, but your plant is deficient in nitrogen, as demonstrated by the yellowing between the veins. A good feed should fix this.

[Wal]

Yes it's just a few on each plant, mainly on top. Was just concerned they were going to get stuck into the new shoots! Thanks for picking that up will give them a bit of urea tomorrow.
Thanks again for your help.

[Wal]

Hi,
they are getting eaten even worse now; even in the new leaves and buds. I can't seem to find an insect on any of them, but I'm assuming it's a large insect??
What would be the best chemical to prevent this from happening? I have sprayed imidacloprid based spray on the foliage but it hasn't seemed to work so far...

[tam]

You might be better with a systemic spray.