Glue boards in Insect Light Traps usually need to be replaced once or twice a month, especially in places with high flying insect activity. Although glue boards are engineered to remain sticky for long periods, light traps eventually turn out to be the problem. The traps either become overcrowded with flies or get coated with dust and other air particles. In such situations, it is advisable to use additional Insect Light Traps to improve the capture range rather than change glue boards more frequently.