Table 1. Weight of neonate Pieris brassicae larvae and the leaf area consumed by them (means ± SD) on Arabidopsis thaliana plants that received egg depositions or a chilling treatment.
| Primary stimulus1 | Secondary triggering stimulus2 | Treatment code | Larval weight (mg/larva) | n3 | P4 | Consumed leaf area (mm2/larva) | n3 | P5 |
|---|---|---|---|---|---|---|---|---|
| None | Feeding | T | 0.28 ± 0.03 | 8 | n.s. | 8.67 ± 2.77 | 8 | n.s. |
| Eggs | Feeding6 | P3E + T | 0.28 ± 0.03 | 8 | 8.15 ± 2.51 | 8 | ||
| None | Feeding | T | 0.32 ± 0.04 | 14 | n.s. | 5.60 ± 1.78 | 15 | n.s. |
| Cold | Feeding | P3* + T | 0.34 ± 0.06 | 18 | 6.56 ± 1.62 | 16 |
1The primary stimulus was lasting 5 days.
2The secondary triggering stimulus started one day after removal of the primary stimulus; larvae were allowed to feed for 2 days.
3n = number of plants treated (performance data of 15–20 larvae were pooled per plant).
4P > 0.05: not significant (n.s.) Mann-Whitney U-Test.
5P > 0.05: not significant (n.s.) Student’s t-test.
6Larvae fed in clip cages on tissue next to the former egg cluster.