Hello, I have 3 sunshine ligustrum shrubs that planted around this time last year. They did great last year and looked to be coming in well this spring until about a week or so ago. I noticed the one in middle thinning out in the back. It has progressively gotten worse. It seems the 2 on the sides are starting to follow suit now also. I water them on average 3 days a week and they receive full sun all day. I can't see any bugs on them but I have seen small spiders in the bed itself. Can anyone tell what's going on and what I can do to save them???