Table 3. Functional response parameters of different life stages of O. strigicollis to different densities of B. tabaci and T. vaporariorum.

The T_h for third instar nymphs and adult females of O. strigicollis increased with increasing prey densities. However, the searching time and searching efficiency show an inverse relationship with both prey densities. The attack rates of both life stages of O. strigicollis were similar with no significant differences at different densities of both prey species.

Prey species	Prey density	Total handling time (Th)		Total search time (Ts)		Attack rate (a)		Search efficiency (E)
		3rd Instar	Adult	3rd Instar	Adult	3rd Instar	Adult	3rd Instar	Adult
B. tabaci	4	9.2	8.1	14.8	15.9	0.064	0.075	0.94	0.93
	6	11.3	10.4	12.7	13.6	0.060	0.070	0.77	0.80
	8	12.1	12.3	11.1	11.7	0.059	0.071	0.66	0.71
	10	15.5	14.3	8.5	9.7	0.075	0.069	0.63	0.66
	12	15.6	14.4	8.4	9.6	0.063	0.058	0.53	0.56
	14	16.0	14.5	8.0	9.5	0.059	0.051	0.47	0.48
T. vaporariorum	4	8.1	6.5	15.9	17.5	0.053	0.053	0.83	0.93
	6	10.3	8.8	13.7	15.2	0.055	0.055	0.70	0.84
	8	12.5	11.0	11.5	13.0	0.060	0.060	0.64	0.78
	10	13.6	12.2	10.4	11.8	0.059	0.059	0.56	0.70
	12	14.6	12.6	9.4	11.4	0.052	0.052	0.50	0.60
	14	14.8	12.5	9.2	11.5	0.044	0.044	0.43	0.51