Mealy bugs affect most species of ornamental plants, including hydrangeas. Hydrangeas are members of the family and are often Hydrangeaceae for large, colorful flowers they produce planted. Mealybugs feed on hydrangea leaves and flowers damage with their piercing mouthparts. Heavy infestations of mealybugs can also lead to the development of sooty mold on host plants.
Mealybugs are small, soft-bodied insects, only 3 mm in length reach. This oval-shaped insects are named for the white, waxy coating on the back that resembles finely ground meal. Mealy bug eggs are also covered with this layer of wax and are extremely small. After hatching, mealy bug nymphs are oval, smooth body and yellow in color. As they get older, nymphs develop their waxy coating.
Mealybugs damage hydrangeas by. On the leaves and flowers Puncturing the plant with their mouths sucking mealybugs on plant sap. Mealybugs produce a sticky liquid as honeydew, which is actually known excrement. Honeydew is the hydrangeas and causes sooty mold to develop. Sooty mold is a fungal disease that causes black coating that develop on the leaves, flowers and stems of host plants.
Light infestation of mealy bugs on your hydrangea is by dipping a cotton ball in alcohol and wiped it be modified to the mealybugs. This will kill mealy bugs and help them out of your system. Heavy infestations are difficult to control and often require chemical controls.
Systemic insecticides are often the best form of control of mealybugs are toxic because these products do the work when the mealy bug feeds. Mealybugs tend to congregate in areas of the plant that are difficult to reach with chemical sprays. Horticultural oils are often a good way to control mealybugs. These products work by suffocation mealybugs.