We have a lilly pilly hedge, nearly every second tree looks like its dying, where as the others look healthy. The trees are about 3 meters tall, I think they are about 7 years old. The leaves that are left are kind of grey green, not bright green like the other plants, it looks like it is trying to sprout new leaves.There is also a kind of coocon thing on the branches which looks like its made of tiny brown balls. Can anyone tell me what this might be and how to fix it?? I can post pictures if this helps.