Garden Column for the Salisbury Post

Darrell Blackwelder

April 29, 2004

     Azalea and rhododendron have problems with insects in the early summer. Lacebugs are cause problems on azalea and rhododendron damaging the foliage. Foliage develops small, yellow splotches at in the beginning stages of infestation.  As the infestation progresses the foliage turns completely yellow. Premature leaf drop occurs when plants are heavily infested.

     Both immature and adult lace bugs are found most often on the underside of leaves.  Spots of excrement resembling dark varnish appear, mostly on the underside of the leaves.

     Female lace bugs lay groups of eggs on the underside of leaves, most often along the midrib. These eggs are dark colored and are partially inserted into the leaf tissue or are pale and completely hidden inside the leaf. Dark, spiny nymphs hatch from the eggs.

     Adult lace bugs have lace-like wings which appear to be clear a lacy hood back of the head. Several different species of lace bugs are found in North Carolina. Most of them produce two or more generations in a year. Adults are about 1/8 inch long and 1/16 inch wide. This insect usually spends the winter in the egg stage.

     Repeated applications of liquid Sevin or Malathion insecticides are needed to effectively control lace bugs. Make the first application as soon as the young nymphs appear in the spring. Follow with a second application 7 to 10 days later if needed. Repeat as needed at monthly intervals. Thorough coverage is essential when applying sprays if good control is expected. It is very important to be sure the underside of the leaves is covered.

     As with any pesticide, always read and carefully follow the instructions.  Contact the Cooperative Extension Service at 633-0571 if you have questions about application of any pesticides.

Darrell Blackwelder is an agricultural agent in charge of horticulture with the North Carolina Cooperative Extension Service in Rowan County. For archived garden columns or other information, visit the Rowan County Master Gardener web site at www.rowanmastergardener.com , e-mail Darrell_Blackwelder@ncsu.edu or phone at 704-633-0571.