Table 2. Duration (days) of the developmental stages.

Duration (days) of the developmental stages of C. septempunctata reared on four aphid species.

Stages	Developmental time (Mean ± SE)
	nb	R. padi	nb	R. maidis	nb	S. avenae	nb	S. graminum
Egg	50	3.56 ± 0.07d	50	5.54 ± 0.07a	50	4.00 ± 0.00c	50	5.00 ± 0.00b
L1	45	2.00 ± 0.00c	46	3.12 ± 0.09a	48	3.04 ± 0.12b	45	3.00 ± 0.00b
L2	43	2.00 ± 0.00c	43	3.16 ± 0.07a	42	3.09 ± 0.10a	40	3.00 ± 0.00b
L3	38	2.47 ± 0.09b	34	3.32 ± 0.08a	34	3.09 ± 0.09b	35	3.06 ± 0.04b
L4	35	2.29 ± 0.08c	32	3.34 ± 0.10a	28	3.07 ± 0.07b	31	3.06 ± 0.04b
Pre-pupa	34	1.00 ± 0.00a	31	1.00 ± 0.00a	28	1.00 ± 0.00a	30	1.00 ± 0.00a
Pupa	29	3.17 ± 0.10c	23	4.35 ± 0.12a	27	3.33 ± 0.09c	24	3.62 ± 0.10b
Pre-adult duration	29	16.38 ± 0.23d	23	24.09 ± 0.27a	27	20.81 ± 0.27c	24	21.71 ± 0.11b
Adult Longevity
Female	19	48.16 ± 0.43c	16	58.12 ± 0.44a	18	50.22 ± 0.48b	17	57.47 ± 0.27a
Male	10	37.1 ± 0.66c	7	46.56 ± 0.40a	9	40.56 ± 0.58b	7	45.71 ± 0.29a

Notes.

L1–L4 refers to the first-to-fourth larval instars. ^b number of individual C. septempunctata that completed the indicated stage. Values with similar letters in a row are statistically non-significant at the 5% confidence level. The standard error (SE) was estimated by bootstrapping (100,000 replications).