Figure 3. Photosensitivity of diapause during nymphal development at 18°C in L. striatellus: (A) when a background period of LD 11∶13 was interrupted by five long photoperiods of LD 15∶9; (B) when a background period of LD 15∶9 was interrupted by five short photoperiods of LD 11∶13.

White bars represent the long photoperiod (LD15∶9), and gray bars represent the short photoperiod (LD11∶13). N3/4 means fourth day of third instar. N = 60–185 for each point.