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Appendix I. Mean number of Rhinocyllus conicus egg cases per wavyleaf thistle ( Cirsium undulatum ) flower head in 20 × 50 m sampling plots as a function of the number of bolting wavyleaf thistles within the sampling plot.

FIG. I1. Mean number of Rhinocyllus conicus egg cases per wavyleaf thistle ( Cirsium undulatum ) flower head in 20 × 50 m sampling plots as a function of the number of bolting wavyleaf thistles within the sampling plot. Plot means for R. conicus egg load per wavyleaf thistle flower head were not significantly related to number of bolting wavyleaf thistles in the sampling plot, nor was there a significant interaction between distance to the focal musk thistle patch and wavleaf thistle density in the sampling plot on egg load per flower head. Regression equations are (1) at 30–50 m: plot mean egg load per head = 2.199 – 0.005(number of bolting wavyleaf thistles), (2) at 80–100 m: egg load per head = -0.047 + 0.009(number of bolting wavyleaf thistles), and (3) at 200–220 m: egg load = 0.357 + 0.019(number of bolting wavyleaf thistles).