Table 3.

Mean (± SE) density (number of mites per plant) and instantaneous rate of increase, r_i (day⁻¹) of Tetranychus urticae before (day 8) and after (day 13) the introduction of Phytoseiulus persimilis, as well as those of the phytoseiid (day 13)

Plant genotype	T. urticae				P. persimilis
	Density day 8	ri (no phytoseiid)	Density day 13	ri (phytoseiid)	Density day 13	ri
SO	195.7 ± 43.5;	0.257 ± 0.031	76.9 ± 27.6	− 0.315 ± 0.073	13.4 ± 3.5	0.271 ± 0.063
CM	272.1 ± 28.9	0.297 ± 0.014	76.0 ± 13.7	− 0.317 ± 0.069	15.4 ± 3.2	0.304 ± 0.048
A*B*C	–	–	–	–	F5,24 = 0.23, P = 0.63	F5,24 = 0.08, P = 0.78
A*B	F5,12 = 1.37, P = 0.30	F5,10 = 5.22, P = 0.03	F5,10 = 0.93, P = 0.41	F5,24 = 2.80, P = 0.08	F5,24 = 0.15, P = 0.86	F5,24 = 0.08, P = 0.78
		SOR3 < SOR1 = SOR2 < CMR1 = CMR2 = CMR3
A*C	–	–		–	F2,27 = 0.03, P = 0.86	F2,27 = 0.01, P = 0.95
B*C	–	–		–	F3,26 = 0.12, P = 0.89	F3,26 = 0.07, P = 0.93
A	F1,16 = 64.25, P < 0.001	F1,16 =  71.89, P < 0.001	F1,28 = 0.01, P = 0.96	F1,28 = 0.01, P = 0.97	F1,28 = 0.66, P = 0.42	F1,28 = 0.62, P = 0.44
	SO < CM	SO < CM	SO = CM	SO = CM	SO = CM	SO = CM
B	F2,15 = 30.41, P < 0.001	F2,15 = 39.22, P < 0.001	F2,27 = 2.59, P = 0.09	F2,27 = 3.33, P = 0.05	F2,27 = 6.50, P < 0.01	F2,27 = 6.55, P < 0.01
	R1 = R2 > R3	R1 = R2 > R3	R1 = R2 = R3	R1 = R2 = R3	R1 = R2 > R3	R1 = R2 > R3
C	–	–	–	–	F1,28 = 0.72, P = 0.80	F1,28 = 0.09, P = 0.78

Densites and r_i values in sour orange (SO) and Cleopatra mandarin (CM) were compared using ANOVA with plant genotype (A) and replicate (B) as factors in the case of T. urticae. For the phytoseiid, T. urticae density at day 8 (C) was also added to the analysis. All possible interactions were initially taken into account but eventually discarded when non-significant (P > 0.05). Mean values correspond to the average of three replicates (R1, R2, R3) of either three (for T. urticae densities and r_i at day 8) or five (for T. urticae and P. persimilis densities and r_i at day 13) plants per plant genotype