Help for ID on a possible pest on my Syringa

Hello I think there is a pest on my newly planted Syringa in my front garden. I have already moved it once from a shady spot to full sun and after that the flowers all turned brown and some leaves shrivelled up and fell off, I trimmed to just below these and have had no new leaves since then and I have noticed all these white spots on the woody stems, see the pic. I have however today noticed a tiny flower bud. I have made sure it’s had enough water, are these known for being drought tolerant though or are they thirsty plants ? I keep reading conflicting info on it. Also what type of feed should I be giving it ?
any help would be much appreciated.
Thanks

having trouble uploading pics right now so will try again soon.

 

Here are the photos

 

@BrennaBee

Not really surprised at this as moving from shade to sun when in leaf is going to be nasty shock even for a lilac. I suspect the lack of new leaves is because it's settling in after the move.
Do the white spots scrape off easily?
In my experience Syringa vulgaris is pretty drought resistant so doesn't need much water or feeding. I had a lilac hedge in Essex that eventually had to be removed as it was taking over the whole garden.
Here in Devon I grow Syringa microphylla and it doesn't get watered or fed and grows happily flowering several times a year. it just gets a light prune now and then. It has never had any pests or diseases, cold spring east winds do scorch off the new growth, but it soon reshoots.
So I wouldn't feed at all, if you want to I would wait until it is growing well and then just use a general feriliser/feed on it probably next spring. Watering I would go easy on that and just see how it looks if very dry give it a good soak every couple of weeks until it starts to grow well and then ease off.

 

I think the white spots are just normal growth.

 

I have planted it in the ground and I believe the soil is neutral, bordering on the acidic side. I will test it again though. One of my neighbours has suggested it may need some lime added.
I should have expected the plant would have some sort of shock after moving it, and the tiny nit of new growth on it looks even better today. The white spots don’t scrape off, tried that and I just exposed some green bark underneath. will see how it goes for now.

 

Are we talking Lilac or Philadelphus? Those don't look like Lilac leaves Whichever, the white spots are nothing to worry about.

 

I'm glad you mentioned that as I wasn't sure it was lilac, but thought it might be a variety that I'd not seen.
I'm not much of a lilacaphile.

 

I was looking at Syringa's a few days ago and some have leaves the same as the one above. Heavily veined with a serrated edge.

 

Hi All, oh yes definitely a Lilac, the new bud continues to grow but still no leaves, I’ve also got a few other syringas maybe different varieties. I’m hoping it’s just settling down now.