Lace bugs are usually detected when injury to the leaves on the host plant becomes evident. The young bugs and adults live on the lower leaf surface and suck up the plant cell contents through slender, piercing mouthparts. This feeding produces numerous yellow or whitish spots on the upper leaf surface. As the insects feed, they deposit their hard, black, varnish-like excrement on the leaf, commonly referred to as “tar spots.” Lace bugs have several generations a season as long as the host plant supports them, so when numbers become high and feeding extensive, leaves will turn brown and drop. To manage lace bugs, periodically inspect plants that have been attacked in the past or are known hosts of lace bugs, and treat as soon as plant injury is apparent. Plants under stress are more susceptible to severe infestations, so evaluate the site and culture for infested plants. In fact, azaleas are less likely to become infested with azalea lace bugs if they are grown in their preferred site—morning sun and afternoon shade.