Field evaluation of indigenous predacious insect, Chrysoperla carnea (Steph.) (Neuroptera: Chrysopidae), fitness in controlling aphids and whiteflies in two vegetable crops

Egyptian Journal of Biological Pest Control

Table 3 Population densities and reduction (%) of the aphid, A. gossypii, on sweet pepper plants received two releasing rates of the second larval instar of C. carnea

	28 Jul.	7 Aug.		17 Aug.		27 Aug.		6 Sep.		16 Sep.		26 Sep.
Releasing rate per plant	Infestation	Infestation	Reduction	Infestation	Reduction	Infestation	Reduction	Infestation	Reduction	Infestation	Reduction	Infestation	Reduction
Control (untreated plants)	3.87 ± 2.4^A	11.53 ± 4.1^A	–	15.20 ± 4.8^A	–	16.47 ± 5.4^A	–	14.60 ± 5.8^A	–	12.47 ± 5.3^A		7.67 ± 3.7^A	–
5	4.73 ± 3.2^A	4.40 ± 1.9^B	61.54 ± 7.2	1.47 ± 1.5^B	90.24 ± 4.4	0.40 ± 0.7^B	97.60 ± 1.8	0.00^B	100	0.00^B	100	0.00^B	100
10	3.53 ± 2.9^A	2.47 ± 2.4^B	78.78 ± 11.5	0.47 ± 0.7^B	96.96 ± 2.6	0.00^B	100	0.00^B	100	0.00^B	100	0.00^B	100
F values (with df = 2.42)	0.710	38.718	–	116.077	–	134.497	–	96.557	–	82.893	–	65.194	–
T values (with df = 1.8)	–	–	2.837	–	2.936		2.981	–		–		–
P	0.497	< 0.001	0.022	< 0.001	0.019	< 0.001	0.018	< 0.001		< 0.001		< 0.001

Means within each column bearing different superscript letters are significantly different according to Duncan test (P = 0.05). Infestation = no. of aphid nymphs per leaf (mean ± SD). Reduction = percentage (%) of reduction comparing to control (mean ± SD)