I have found these white moths (very small, winged, can fly) below the leaves of my Arabian jasmine plant, and the plant has stopped flowering and is in a poor state. There are surprisingly some white scaly patches too on the leaves, though I am not sure if these are related with the white moth. They look more like fungi to me though I might be wrong. I have tried using insecticides but they don't seem to be working, and the moths and the scales keep coming back. Can anyone please help me identify the insect/fungus and suggest a remedy?
As the renowned Stephie has pointed out in the comment this is Whitefly which is a very common pest. The scales are discarded pupae cases from the larvae.
The key in pest control is to:
- remove other sources of whitefly which can reinfect the plant. Are other plants infected? Remove them and isolate this plant from healthy ones
- spray with 5ml dish soap to one liter of water, or, wipe down with a cloth soaked in the solution
- repeat at five to seven day intervals so you catch the eggs as they hatch
- three applications or more are likely to be needed