Abstract
Electrophysiological techniques and neutral density filters were used to determine the minimum levels of radiation from a 15-watt ultraviolet lamp that could be detected by dark-adapted eyes of moths of laboratoryreared Heliothis zea (Boddie) and H. virescens (F.), and of field-collected H. zea . When the inverse square law was then used to calculate the maximum distances at which the least sensitive and most sensitive moths could detect the radiation from the lamp, it was found to be 31 to 250 m, respectively.
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