Effect of different cold storage periods of rearing host eggs on the performance of the parasitoid Trichogramma evanescens (Westwood) (Hymenoptera: Trichogrammatidae)

Egyptian Journal of Biological Pest Control

Table 1 Effect of using cold-stored S. cerealella eggs on the efficacy of Trichogramma evanescens

Cold storage periods	Number of parasitized eggs/female	% parasitism	% emergence	% females	Female longevity (days)
Control	48.44 ± 0.58^a	96.44 ± 5.08^a	96.92 ± 6.47^a	70.04 ± 1.68^a	4.36 ± 0.64^a
5 days	45.04 ± 0.95^b	90.08 ± 0.87^b	94.85 ± 2.19^a	65.91 ± 0.66^b	4.04 ± 0.68^ab
10 days	42.86 ± 4.33^c	85.72 ± 1.11^c	84.91 ± 5.03^c	62.92 ± 0.89^c	3.84 ± 0.68^b
15 days	30.62 ± 1.27^d	61.24 ± 1.51^d	80.48 ± 0.66^d	60.85 ± 1.21^d	3.44 ± 0.69^c
20 days	24.54 ± 1.44^e	49.08 ± 2.03^e	61.17 ± 1.54e	51.64 ± 2.50^e	2.8 ± 0.51^d
30 days	10.22 ± 4.65^f	20.44 ± 1.47^f	50.73 ± 4.17^f	48.46 ± 7.16^f	2.48 ± 0.41^d

Means followed by the same letter, in the same column, are not significantly different. (Duncan’s multiple range tests) (Duncan 1955)