Figure 4. Effect of imidacloprid on elm leaf area in New York (A) and Maryland (B).

Figure depicts area of leaves (√cm²) used in surveys of arthropod community presented in Figure 1. Elms (treated: N = 10; untreated: N = 10) in New York had a significantly greater leaf area following exposure to imidacloprid in all sampling years, while trees in Maryland (treated: N = 10; untreated: N = 10) were larger in the last year of the study. Means±s.e.m. marked with asterisks are significantly different at P<0.05.