Help! Murraya Koenigii yellowing leaves
I have a Murraya Koenigii (Indian Curry Plant) in a container. Last entire year and winter, it did well and grew fine. This year, about a month back I repotted it in a bigger pot. For record, new pot is much bigger than the original pot.
The plant grew well initially. It also threw bunch of new branches and even flower buds -- which it never did before -- but now suddently leaves are drooping. Leaf tips are turning yellow/copper. When leaf twigs on the plant are touched, they come off very easily. Some leaves have a kind of black powdery stuff on them.
I have been watering it very sparingly because I heard that plant does not like too much water, plus in large containers, moisture is retained longer.
Is this due to overwatering, underwatering, wrong soil type(I used regular Miracle Gro Potting Mix) -- or lack of fertilizer?
Can someone please help me? I am confused by why the plant is doing badly when the season is so great! I am in SF Bay Area, by the way.
Thanks in advance!!