They suck the fluids from leaves and stems, robbing plants of essential nutrients.
Mealybugs feed on all parts of the plant, but especially on tender new growth.
Leaves wither and yellow and, on crop plants, fruit may drop prematurely. Identify mealybugs by looking on the undersides of leaves and around leaf joints. Mealybug-damaged plants look withered and sickly and may have sticky sap on the leaves and stems. Spray a strong jet of water directly on to the affected area of the plant. The stream washes the insects off.