Brown Spots on Leaves & Stems of Hardy Hibiscus
I live in South Carolina and my Hardy Hibiscus plants were doing great, but in the last few days I noticed these brownish-blackish spots on the leaves & the leaves were turning yellow. Today I noticed these spots were beginning to appear on the main stem as you can see in the photo. I am hoping someone here will be able to identify the problem for me.
There are also a few big leaves which have been half eaten and a few with decent sized holes in the center. Would that be from grasshoppers or caterpillars?