Biological performance of Bollgard II® Bt-resistant vs susceptible population of pink bollworm, Pectinophora gossypiella (Saunders) on non-toxic diet

Table 2 Different biological parameters of the pink bollworm reared on a semisynthetic diet

Parameter No.	Particulars	Lab-S		Field-R
Parameter No.	Particulars	Mean ± SD	Range	Mean ± SD	Range
1	Egg/incubation period /days	4.80 ± 0.84^a	4–6	5.80 ± 1.30^a	5–8
2	Larval period /days
	1st instar	2.00 ± 0.71^a	1–3	2.20 ± 0.84^a	1–3
	2nd instar	4.40 ± 0.55^a	4–5	5.80 ± 1.30^a	4–7
	3rd instar	5.40 ± 1.34^a	4–7	6.60 ± 1.14^a	5–8
	4th instar	7.00 ± 1.23^a	6–9	8.80 ± 1.30^a	7–10
	Total	18.80 ± 2.17^a	17–22	23.40 ± 0.55^b	23–24
3	Pupal period /days	7.40 ± 0.89^a	6–8	9.60 ± 2.07^a	7–12
4	Adult period /days
	Male	11.80 ± 1.30^a	10–13	11.20 ± 1.79^a	9–13
	Female	15.20 ± 0.84^a	14–16	14.80 ± 1.76^a	13–17
5	Total life cycle /days
	Male	42.80 ± 3.83^a	40–49	50.00 ± 2.45^b	47–53
	Female	46.20 ± 3.27^a	42–51	53.60 ± 2.99^b	50–57
6	Pre-oviposition period/days	2.80 ± 0.45^a	2–3	3.20 ± 1.30^a	2–5
7	Oviposition period /days	7.80 ± 1.30^a	7–10	7.20 ± 1.21^a	6–9
8	No. of eggs/female	154.20 ± 39.80^a	96–206	100.60 ± 5.68^b	95–110
9	No. of fertile eggs	138.00 ± 37.84^a	88–191	88.00 ± 7.14^b	81–99
10	Percentage of fertility	89.49 ± 4.98^a	84–92	87.48 ± 3.42^a	82–90
11	Percentage of pupation	88.00 ± 13.04^a	80–100	86.00 ± 11.40^a	70–100
12	Percentage of adult emergence	92.00 ± 8.37^a	80–100	88.00 ± 8.37^a	80–100

SD standard deviation; the same letter below the means represents do not differ significantly between the populations at P < 0.05 according to Tukey’s test; Lab-S laboratory-established Cry toxin-susceptible population, Field-R field-collected Cry toxin-resistant population; the sample size was 250 eggs

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