Answer: Whiteflies can be a terrible problem on plants. You can make a sticky trap to attract and kill whiteflies. Take a bright yellow piece of cardboard (or paint an index card bright yellow) and smear it with petroleum jelly or 'Tanglefoot'. Mount the card at foliage level. Whiteflies will be attracted to the yellow color and when they land, they'll get hopelessly stuck. Before putting the trap in the plant, hose off or wash the leaves well to dislodge both adults and their eggs. Pay special attention to the undersides of leaves and the stems of the plants. If all else fails, use a permethrin based houseplant insecticide. Whiteflies are very difficult to eradicate, so keep after them! Fungus on the leaves indicates too much humidity around the plants, or not enough sunlight. Try placing the roses where there's good air circulation all around. Good luck with your roses!
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