Yellow-Brown spots on Zee Zee plant leaves
I purchased a zee zee plant almost two month ago and the plant looks healthy overall. I water it once a week since it's summer and hot here. For last 2 weeks I have been observing yellow to brown spots on few leaves of this plant. These spots are not only on the lower leaves ( I suppose that might be symptom of being deciduous ? ) but also on the leaves on the upper part of the stems.
This morning I have removed two leaves which were total yellow brownish . It was not limited to spot , rather the whole leaves looked yellow and sick. After removing them I have taken attached photo on which you can see a leaf started with same problem.
Any idea what is causing this issue ? I usually keep this plant inside. But it was on balcony under full sun for few days . Also once I have seen one grasshopper on its leaves. Is this problem due to over/under watering or any disease? What should I do now for a healthy, disease free zee zee plant ?