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Table 1 Effect of different concentrations of SpfrNPV on the development stages (mean ± SE) of Spodoptera frugiperda

From: Sub-lethal effects of indigenous isolate of Spodoptera frugiperda nucleopolyhedrovirus on fall armyworm growth and reproduction in India

Concentration (OBs/larva)

Days

3rd instar

4th instar

5th instar

Pre pupae

1

1.20 × 107 (n = 45)

3.42 ± 0.20ab

3.05 ± 0.12b

1.68 ± 0.24c

2.98 ± 0.17b

2

2.83 × 106 (n = 46)

3.72 ± 0.19a

3.20 ± 0.12b

1.84 ± 0.27bc

2.27 ± 0.06ab

3

2.00 × 106 (n = 46)

3.56 ± 0.22ab

3.16 ± 0.05b

2.16 ± 0.29abc

2.58 ± 0.22ab

4

1.29 × 105 (n = 47)

3.84 ± 0.16a

4.38 ± 0.29a

2.68 ± 0.21abc

2.38 ± 0.37ab

5

5.69 × 104 (n = 47)

3.50 ± 0.33ab

3.39 ± 0.17b

2.78 ± 0.16ab

2.32 ± 0.05ab

6

Control (n = 49)

2.74 ± 0.17b

2.24 ± 0.06c

3.06 ± 0.14a

2.05 ± 0.10a

  1. Within columns, mean number of days followed by the same letter do not differ significantly [ANOVA, Tukey’s HSD; P < 0.01]