Lehigh County is cooperating with the Pennsylvania Department of Conservation and Natural Resources Bureau of Forestry and the USDA Forest Service in a joint effort to spray gypsy moth caterpillars this spring in high use areas within the county. The areas include Leaser Lake and Trexler Zoo.

A biological insecticide, Bacillus thuringiensis var. kurstaki (Bt), which only affects leaf-eating caterpillars, will be used.The spraying is scheduled to occur sometime in late April to early June depending upon caterpillar and leaf development. Spraying will be done by aircraft starting daily at daybreak and continue as long as wind and other conditions are acceptable. Evening, weekend and holiday spraying will also be conducted when conditions permit.The spray has not been shown to be harmful to humans, pets, livestock or gardens. However, it is recommended that that people observe normal precautions and remain under cover during the spray.If exposed to the spray, wash with soap and water.