Laboratory evaluation of toxicity of selected insecticides against egg and larval stages of cotton pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae)

Table 3 Larvicidal effect of insecticides against neonate larvae of cotton pink bollworm

Treatment No	Treatment details	Sample size (n)^*	Corrected larval mortality /%^#		Reduction in insecticide efficacy due to larval entry inside the bolls /%
Treatment No	Treatment details	Sample size (n)^*	Insecticide treatment to the green bolls prior to larval release	Insecticide treatment to the green bolls after release and entry of larvae inside the bolls
T1	Profenophos 50% EC	75	93.74 ± 6.25^a (81.00 ± 8.33)	36.64 ± 2.90^a (37.22 ± 1.73)	60.91
T2	Lambda-cyhalothrin 5% EC	75	98.14 ± 1.85^a (85.00 ± 4.31)	24.39 ± 3.09^bc (29.50 ± 2.09)	75.15
T3	Emamectin benzoate 5% SG	75	99.98 ± 0.00^a (89.34 ± 0.04)	24.39 ± 3.09^bc (29.50 ± 2.09)	75.61
T4	Ethion 50% EC	75	99.98 ± 0.00^a (89.34 ± 0.04)	26.47 ± 1.47^bc (30.95 ± 0.95)	73.52
T5	Cypermethrin 25% EC	75	97.21 ± 2.77^a (83.99 ± 5.39)	28.43 ± 3.43^b (32.15 ± 2.15)	70.75
T6	Neem seed kernel extract (NSKE) 0.15% EC	75	76.62 ± 4.25^b (61.26 ± 2.87)	10.17 ± 1.97^d (18.41 ± 1.98)	86.72
T7	Profenophos 40% + Cypermethrin 4% EC	75	99.98 ± 0.00^a (89.34 ± 0.04)	36.76 ± 3.68^a (37.28 ± 2.18)	63.23
T8	Chlorpyrifos 50% + Cypermethrin 5% EC	75	99.98 ± 0.00^a (89.34 ± 0.04)	36.76 ± 0.74^a (37.32 ± 0.44)	63.23
T9	Ethion 40% + Cypermethrin 5% EC	75	99.98 ± 0.00^a (89.34 ± 0.04)	22.30 ± 3.55^c (28.05 ± 2.39)	77.69
T10	Control (water spray)	75	0.01 ± 0.00^c$ (0.57 ± 0.00)	0.01 ± 0.00^e& (0.57 ± 0.00)	0.00
F test			sig^**	sig^**
SE (diff.) ±			5.00	2.52
CD at 5%			10.44	5.26
CV /%			8.08	11.00

^*Represents total sample size, i.e., 75 larvae (25 larvae per replication)
^#In parentheses are arc sin transformed values (Gomez et al. 1984)
^**F test is highly significant at 1% level of significance. The corresponding control mortalities used for calculating corrected mortalities in pre- and post-larval release treatments were: ^$23.33 ± 8.82% and ^&18.33 ± 1.67%
^{a, b, c, d, e}The same letter as superscript to values within a column indicate that the treatments are not significantly different from each other

ISSN: 2523-3254