Table 1 Effects of different cold storage periods of Sitotroga cerealella eggs at − 20 °C on Trichogramma evanescens parasitism, emergence rate, and sex ratio

Control

4286.00 ± 0.33

97.10 ± 0.10a

97.50 ± 0.07a

97.70 ± 0.33a

1/2 h.

3556.66 ± 0.35

21.50 ± 0.85b

80.40 ± 0.33b

87.30 ± 0.33b

1 h.

3553.33 ± 0.58

18.54 ± 0.58b

67.50 ± 0.80c

86.33 ± 0.88b

2 h.

3307.33 ± 0.58

10.55 ± 0.85c

63.10 ± 0.11c

85.33 ± 0.33b

P

0.0000

0.0000

0.0000

F

820.00532

51.363718

118

df

11

11

11