Popul Ecol (2005) 47:71–76

In Table 2, unnecessary words appeared in two entries in column 1. “Grid plot*plant” should read “Plot*plant,” and “Rid error” should read “Error.” The correct table appears here.

Table 2 Homogeneity-of-slopes model for the effect of aphids at the plant and plot scale on C. maculata and H. convergens adult density