||Many insects, especially nocturnal insects, exhibit positive phototaxis to artificial lights. Many light traps are currently used to monitor and manage insect pest populations, with light traps playing a crucial role in physical pest control. Efficient use of light traps to attract target insect pests becomes an important topic in application of integrated pest management (IPM). Phototactic responses of insects vary among species, light characteristics and the physiological status of the insects. In addition, light can cause several biological responses, including biochemical, physiological, molecular and fitness changes in insects. In this review, we discuss several hypotheses on insect phototaxis, affecting factors on insect phototaxis, insect sensitive wavelengths, biological responses of insects to light and countermeasures for conserving beneficial insects and increasing trapping effect. Additionally, we provide information on the different sensitivities to wavelengths causing positive phototactic behavior on more than 70 insect pest and beneficial insect species. The use of advanced light traps equipped with superior light sources, such as light emitting diodes (LEDs), will make physical pest control in IPM more efficient. This article is protected by copyright. All rights reserved.