Dept of Agriculture Development 
SFAC KeralaNymphs secrete sticky honeydew, which drops on to lower leaves.On these ,black sooty mould develops, which interrupts photosynthesis of the leaves.
Adults can be trapped by placing yellow sticky traps between rows of cardomom plants.
Nymphs are effectively controlled by spraying the lower surface of leaves with a mixture of neem oil (500 ml) and triton (500 ml) in 100 litres of water.
Acephate 0.1 per cent is effective.The spray may be repeated two or three times at 15 days interval.
