Abstract: In this paper,the phototactic behaviors of different emergence period Helicoverpa armigerawere studied in a phototactic box.The results showed that under the five test wavelength lights,different emergence period female and male moths had no significant difference in their phototactic behaviors. The phototactic rate differed significantly when the dark-adapted time was between 15 and 30 min,but had no significant difference among 30,45 and 60 min.No significant difference was also found in phototactic rate between dark-adapted time 0 and 15 min under test wavelength lights except green one (500～565 nm).

Key words: Pumica granatum, Bowen ratio, Energy balance, Evapotranspiration