1 Under dark adaptation, phototactic ratio of round scad (both juvenile-and adult) towards blue and green light is the highest, while that towards red light is the lowest.

2 Under the above condition, phototactic ratio of both round scad and common Japanese mackerel towards white colour light is lower than that towards the colour light that causes the greatest reaction.

3 The phototactic response of adults of Heliothis armigera (Hubner) and Helio-this assulta Guenee to 13 monochromatic lights in the range from 333 nm to 656 nm is very similar.

4 Repelled by light; exhibiting a negative phototactic or phototropic response.

5 By the black light lamp lure and investigation day after day, the population dynamics of Lepidoptera phototactic insects in hill area of lower Taihang Mountain is studied.

6 Experimental results indicate that there are 206 kinds of phototactic insect species belonging to 16 families in this region.

7 Because of the large space between seed trees and the plentifulness of light, the phototactic insects are favoured in existence and propagation.