The herbicide treatment (H) significantly reduced the mean seed weight of R.acris (Table 2). In all herbicide treated plots (H, H + I, and F + H + I) the mean weight of R. acris (H = 0.6 mg, H + I = 0.7 mg, F + H + I = 0.5 mg) was only about one third of that in the control plots (C = 1.6 mg) (Table 2).