The temperature sensitive period for inturned . Shown is the fraction of normal laterals (i.e. not multipled or branched) after various treatments. At least 20 laterals were scored for each point (in most cases more than 40 laterals). The filled box is for pupae kept at 29°C and the open box for pupae kept at 18°C. The time of the shift is in hours after white prepupae formation. Laterals form at about 26 hrs at 29°C and 52 hrs at 18°C. There is some variability as distal laterals form earlier than proximal ones.