My three baby varigated hydrangeas' leaves were being eaten about a couple of months ago as they were growing out for the season, so I sprayed them with diazinon (I am still working with a bottle purchased a few years ago) which usually takes care of any infestation. But am still having this problem. This year in the NW gulf coast of FL there have had a lot of problems with slugs. Do you think this may be the problem and what should I use to combat this? They are looking terrible.