Photinia (Red Robin) hedge problem - insects

Hi,

We planted a few Photinia Fraseri (Red Robin) plants in February this year on the border of our front garden to build a hedge. The plants seem to be doing well - lots of new shoots and red leaves. I pruned it once couple of weeks ago.

Over the last month, I have noticed little insects sticking to the new shoots and leaves. These look like big black ants. In addition, there are little green larva kind of insects giving them company. Many of the leaves appear to be eaten by insects, and some of the new leaves seem to be drying up. I have included couple of pictures of these.

Please help!

 

Thank you very much Loofah. Sound advice - I will leave it as it is for the time being, and if things haven't improved will consider insecticide.