Ecology of Vector Mosquitoes of Japanese Encephalitis, Especially of Culex tritaeniorhynchus : 3. Seasonal changes in the time of being attracted to dry ice in the females of Culex tritaeniorhynchus.

The time of being attracted to dry ice of Culex tritaeniorhynchus females in the evening roughly depends on the sunset time. Strictly speaking, however, the former time much fluctuates seasonally than the latter time. In spring, the starting time of being attracted to dry ice is usually over half an hour earlier than the sunset time, and the peak time appears around the sunset time. With the progress in season, the time in relation to the sunset time becomes later gradually and in summer and autumn the starting time, and consequently the peak time, becomes in most cases, later than the sunset time. In other words, the illumination in Lux at the time of being attracted to dry ice is much higher in spring than in the other seasons.