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Mean (±s.e.) Plutella xylostella (a) relative growth rate and (b) pupal weight with (B + P, open circles) or without (P, filled circles) B. brassicae on plants growing in ammonium nitrate (AN), chicken manure (CM) or John Innes (JI) fertilizer, or unfertilized compost (NF). Significant ANOVA factors: ***p < 0.001.
