Impact of egg mass layers and scale thicknesses of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), on the parasitic performance of Trichogrammatoidea bactrae (Hymenoptera: Trichogrammatidae)

Egyptian Journal of Biological Pest Control

Table 4 Percentages of parasitism, adult emergence rates and females ratio of Trichogrammatoidea bactrae in F₁ progeny emerged from Spodoptera frugiperda egg masses on different layers’ and scales' thickness

Egg masses	Parasitism (%)	Adult emergence (%)	Female (%)
One layer without scales	87.1 ± 0.49^a	90.95 ± 1.65^bc	74.00 ± 2.5^abc
One layer with low scales' density	85.78 ± 1.11^a	90.91 ± 1.50^bc	73.4 ± 3.38^abcd
One layer with mid-scales' density	76.50 ± 2.09^b	85.52 ± 2.53^c	68.35 ± 1.57^d
One layer with thick scales' density	67.16 ± 1.25^c	87.11 ± 2.17^bc	75.00 ± 1.96^ab
Two layers with low scales' density	73.15 ± 2.69^bc	91.97 ± 0.64^b	69.54 ± 2.59^bcd
Two layers with mid-scales' density	70.82 ± 2.1^bc	88.65 ± 2.37^bc	74.67 ± 0.82^ab
Two layers with thick scales’ density	54.5 ± 1.05^d	88.94 ± 3.15^bc	70.27 ± 1.16^cd
Three layers with low scales' density	47.12 ± 0.8^e	90.83 ± 0.47^b	76.17 ± 0.81^a
Three layers with mid-scales' density	43.10 ± 1.67^f	95.55 ± 1.03^a	73.64 ± 2.00^abcd
Three layers with thick scales' density	37.38 ± 2.43^f	87.50 ± 0.79^c	73.5 ± 0.80^b
F_{(9, 90)}	113.714	2.618	2.054
P_ANOVA	< 0.0001	0.014	0.0489

Means ± SE sharing the same small letters in the same columns are statistically insignificant (P > 0.05)