Somethng is eating the inner part of my rose leaves. The green part of the leaf is gone and you can see transparent film underneath the chewed part. I can not find any insects on the plant. I have bad eyes, so if they are very tiny I am going to have to use a magnifying glass. I wish I could post a picture, but I don't have a digital camera. Anyone have a clue? What do I do to get rid of the pest?