Table 3.

Relative growth of Mamestra brassicae larvae on exotic and native plants. Relative growth was calculated as end weight/begin weight

Genus	Species	Origin	Mean growth (±SE)	N
Artemisia	biennis	Exotic	0.30 (±0.12)	9
	vulgaris	Native	2.96 (±0.67)*	10
Bidens	frondosa	Exotic	2.70 (±0.85)	5
	tripartita	Native	1.36 (±0.63)	4
Senecio	inaequidens	Exotic	1.33 (±0.23)	10
	jacobaea	Native	3.50 (±0.78)+	10
	vulgaris	Native	4.30 (±0.67)*	10
Solidago	gigantea	Exotic	0.72 (±0.31)	10
	virgaurea	Native	4.31 (±0.79)*	10
Tanacetum	parthenium	Exotic	0.85 (±0.20)	9
	vulgare	Native	1.63 (±0.47)	9
Tragopogon	dubius	Exotic	1.44 (±0.31)	6
	pratensis	Native	0.35 (±0.10)*	10

Asterisk, significant differences between exotic and native species within congeneric species pairs (ANOVA, significance level after Bonferroni correction for multiple tests *P < 0.008, ⁺P = 0.05).