Table 1.

Feeding behavior parameters (mean + /- SEM) of M. persicae on sweet pepper depending on the plant status (sweet pepper associated or not with leek) and on the aphid status (pre-exposed or not to leek VOCs). Behavior of naive M. persicae on sweet pepper alone (P) was compared to that of naive M. persicae on sweet pepper associated with leek (PL) and then behavior of naive M. persicae on sweet pepper associated with leek (PL) was compared to that of pre-exposed M. persicae to leek VOCs on sweet pepper associated with leek (pPL).

	Naive aphids on sweet pepper alone (P)		Naive aphids on sweet pepper associated with leek (PL)		Preexposed aphids on sweet pepper associated with leek (pPL)		P vs PL		PL vs pPL
	n		n		n		U	p-value	U	p-value
General probing phase (Pr)
Total duration of probing (min. s_Pr)	29	437.10 ± 6.12	26	434.11 ± 4.64	22	427.78 ± 6.50	429	0.388	270	0.751
Number of probes (n_PR)	29	14.17 ± 1.84	26	14.54 ± 1.99	22	13.04 ± 1.10	366.5	0.866	298	0.812
Time to first probe (t > IPr)	29	6.77 ± 1.10	26	10.39 ± 2.63	22	4.55 ± 0.65	384	0.914	319	0.334
Pathway phase (C)
Total duration of pathway phase (min. s_C)	29	156.05 ± 16.55	26	181.82 ± 11.74	22	133.01 ± 7.61	299	0.193	421	0.005
Pholem phase (E)
Total duration of salivation phase (min. s_E1)	29	43.91 ± 7.55	22	43.72 ± 7.17	18	36.30 ± 6.53	295	0.658	229	0.411
Time to first phloem phase (min. t > 1E2)	17	120.82 ± 27.78	14	193.27 ± 27.89	10	236.36 ± 21.78	173	0.032	54	0.371
Duration of sustained phloem phase (min. s_sE2)	17	239.00 ± 38.83	10	120.53 ± 32.23	10	136.81 ± 21.11	41	0.027	45	0.739
Other phases
Total duration xylem phase (min. s_G)	27	57.00 ± 11.04	26	97.55 ± 10.97	21	102.11 ± 13.88	197	0.006	290	0.727
Total duration of derailed stylet phase (min. s_F)	10	119.69 ± 25.67	14	122.25 ± 26.16	19	122.35 ± 9.80	74	0.841	119	0.628

P values < 0.05 (Mann–Whitney U-test) are written in bold; n: sample size.