Lace Bugs: Identification, Damage & Treatment

Lace Bug Damage

lacebug damage on azaela

We’re seeing heavy infestations of Lace Bug populations (not to be confused with “lace wings” which are beneficial predators) on Azaleas, Rhododendrons, Andromeda, Cotoneaster, and other shrubs and trees on numerous properties that don’t have Integrated Pest Management programs in place.

There are a variety of lace bugs, each with a preference for particular plant varieties. The adult and nymph forms both have piercing, sucking mouthparts and feed on the undersides of the plant’s leaves.

Heavy infestations weaken plant health and vigor, leaving them vulnerable to other insect damage, disease, and environmental stress. Regular monitoring by our Plant Health Care diagnosticians usually detects lace bug populations before damage reaches the level of yellowish to white stippling on the topsides of leaves. Left untreated, plants decline and can eventually die.


Lace bugs and nymphsIn mid-May, eggs that have been allowed to overwinter on the underside of leaves begin hatching. Lace bugs can have as many as 4 generations or more in a year depending on weather conditions. Left undetected, populations can quickly reach levels causing economic and aesthetic damage.

How to Control Lace Bugs

Lacebug damage on azaelasIn early spring, our technicians begin inspecting the undersides of leaves of susceptible plants for evidence of overwintering adults, eggs and newly hatched nymphs. Early control in the spring puts a damper on the reproductive pipeline during the season, and fall control limits overwintering populations for the subsequent year, keeping populations at tolerable levels.

Minor infestations can be effectively knocked-back and kept in check with insecticidal soaps, neem oil, and horticultural oils which preserve beneficial predators such as green lacewings, earwigs, spiders, minute pirate bugs and assassin bugs.

It’s very important to note that sprays must adequately cover the undersides of the leaves to be effective. Regular monitoring will catch any re-infestations and determine if additional treatments are necessary.

Featured image courtesy of Jim Baker, North Carolina State University,

Bill Grundmann

Bill is the owner of Organic Plant Care, LLC. He takes an integrated approach to tree care, focusing not only on the trees themselves but also on the surrounding environment, managing tree health from the "ground up" - healthy soil equals healthy plants. Bill is a New Jersey Licensed Tree Expert and NJ Approved Forester with over 35 years of experience in the tree care industry.