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 1 Percentages of parasitism of Trichogrammatoidea bactrae on Spodoptera frugiperda egg masses on different layers’ and scales' thickness in a non-choice and choice tests

Egg masses	^aExposed eggs	Parasitism (%)		t-test
Egg masses	^aExposed eggs	Non-choice test	Choice-test	P-value
One layer without scales	265.64	88.98 ± 0.91^aA	86.26 ± 1.25^aA	0.094
One layer with low scales' density	269.25	88.74 ± 1.56^aA	88.70 ± 1.37^aA	0.985
One layer with mid-scales' density	270.55	81.50 ± 2.35^bA	82.18 ± 2.31^abA	0.192
One layer with thick scales' density	268.8	73.48 ± 1.27^cA	55.82 ± 5.36^eB	0.008
Two layers with low scales' density	279.37	71.62 ± 1.78^cdB	81.47 ± 1.68^bcA	0.0005
Two layers with mid-scales' density	279	67.99 ± 2.09^dB	76.11 ± 2.91^cdA	0.035
Two layers with thick scales' density	275.5	58.35 ± 3.19^eB	71.68 ± 1.18^dA	0.0009
Three layers with low scales' density	278.86	46.57 ± 2.58^fB	53.28 ± 0.41^eA	0.021
Three layers with mid-scales' density	280.5	43.83 ± 2.75^fA	44.79 ± 1.91^fA	0.778
Three layers with thick scales’ density	280.94	36.05 ± 1.29^gA	40.07 ± 2.43^fA	0.163
F_(9,150)		73.729	56.161
P_ANOVA		< 0.0001	< 0.0001

Means ± SE sharing the same small letters in the same columns and same capital letters in the rows between tests are statistically insignificant (P > 0.05)
^aMean number of exposed eggs