Resistance of Echinochloa crus-galli Populations to Acetolactate Synthase-Inhibiting Herbicides

Figure 1

Probit analysis to predict the lethal dose of (a) bispyribac-sodium, (b) imazamox, and (c) penoxsulam required to kill 50% (LD₅₀) and 90% (LD₉₀) of E. crus-galli plants of each population (thick lines). Thin lines represent 95% confidence intervals (CIs) for each population. Lines of AR1 and AR2 for imazamox, and of AR1 for penoxsulam not shown, because the highest tested doses of imazamox (32X; 1X = 35 g ai ha⁻¹) and penoxsulam (32X; 1X = 35 g ai ha⁻¹) were not able to kill 50% of plants of these populations.

(a)

(b)

(c)