Effects of photoperiod and temperature on larval development of Chrysoperla carnea Stephens (Neuroptera: Chrysopidae)

Abstract

The effects of photoperiod and temperature on the developmental period of the larval stages of Chrysoperla carnea were studied under laboratory conditions. Developmental zero was 10.2°C and the thermal constant for the developmental period of one generation was 414 degree-days. The developmental period at 27.5°C was longer than at 25°C. On the other hand, the developmental period of pre-imaginal stages depended on photoperiod. The durations of the pre-imaginal stages were longer under 16L-8D, 13.5L-10.5D and 10L-14D than under 14L-10D and 13L-11D. These results indicate that the pre-imaginal stages are sensitive to both short and long days. It is assumed that this dependence on photoperiod is useful for overwintering adults emerging in the autumn.