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The biomass of parasites (A) of different-aged invasive B. pilosa plants, and the ratio of parasite biomass to host biomass (B). Values are given as means +1 SD (n = 6). Different letters indicate significant difference between host plants of different ages at P < 0.05. F-value and significance levels are given. ***Significant difference in means between plants within the same age class at P < 0.001.
