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 4 Population densities and reduction (%) of the whitefly, B. tabaci, 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)	32.73 ± 2.5^A	5.33 ± 2.8^A		6.73 ± 3.9^A		6.93 ± 3.7^A		5.93 ± 3.7^A		7.07 ± 4.6^A		7.00 ± 4.2^A	–
5	3.13 ± 3.0^A	2.47 ± 2.5^B	53.60 ± 27.4	0.60 ± 1.1^B	91.06 ± 6.6	0.13 ± 0.5^B	97.98 ± 4.5	0.00^B	100	0.00^B	100	0.00^B	100
10	2.60 ± 2.8^A	0.60 ± 1.1^C	89.06 ± 12.6	0.13 ± 0.5^B	97.92 ± 4.7	0.00^B	100	0.00^B	100	0.00^B	100	0.00^B	100
F values (with df = 2.42)	0.151	16.839	–	35.870	–	51.947	–	39.549	–	34.848	–	40.833	–
T values (with df = 1.8)	–	–	2.633	–	1.905	–	1.000	–	–	–	–	–
P	0.861	< 0.001	0.030	< 0.001	0.093	< 0.001	0.347	< 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 whitefly nymphs per leaf (mean ± SD). Reduction = percentage (%) of reduction comparing to control (mean ± SD)