During winter time, my curry leaf plant #3 and #4 are in green house. The plant #3 is not having vivid green color on the leaves so I went to check them.
There they are, scale insects. I saw big drop of sticky honey dew of the scale insects.
They rapidly expands their population under such environment where natural enemy do not exist. Best bet is to observe the plant, time to time.
I could shower and wash the plant, but the leaves appeared not to be in good shape, so I decided to do hard prune.