Answer: I don't know if the cause is water stress, a fungal disease or if there is insect activity. Start by inspecting the leaves and stems for signs of insect pests, if none, it may be a disease. The best way to determine what the problem might be is to take a few of the affected leaves to a well staffed nursery or to your local cooperative extension office. Helpful folks there can determine the cause and suggest solutions.
Q&A Library Searching Tips