From: Pre-emptive augmentative biological control of Spodoptera frugiperda in Europe using Trichogramma spp.
Egg mass category
No. of larvae hatched/No. of eggs counted
One-layer, no hair
0.90 ± 0.02
One-layer, with hair
0.93 ± 0.02
Two-layer, no hair
0.95 ± 0.02
Two-layer, with hair
0.98 ± 0.02
Three-layer, with hair
0.93 ± 0.03