Why are filth flies attracted to Insect Light Traps?

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Why are filth flies attracted to Insect Light Traps?

Bulbs used in Insect Light Traps emit intense UVA beams between 315nm and 400nm. The spectral sensitivity of pests, particularly filth flies, to light in this particular wavelength draws them to these bulbs. Hence, Insect Light Traps use UV light to deliver superior fly catch performance.