I have a glorious variant of azelea it has red leaves which are in turn to green leaves and bundles of white flowers. I have noticed something in the leaf brown in colour, it seems to be all over and also in a cherry tree leaf i have as well what can i do to rid it off my plants please, A few years ago i had red spider on my lilies which i managed to get rid of, well at least it did not surface last summer at all. these are the only pests i have had .