Fig. 2. Effect of ultraviolet-B (UVB) radiation on survival of Italian ryegrass seedlings of a parental population when treated with different doses of diclofop-methyl. Bars represent means ± standard errors. Analysis of variance for (A) 1996: UVB light (L), P = 0.18; herbicide dose (D), P = 0.0001; L x D, P = 0.95. Analysis of variance for (B) 1997: L, P = 0.12; D, P = 0.00001; L x D, P = 0.04.