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Additional index words. Fragaria × ananassa, lactofen, fomesafen, acifluorfen Abstract. The postemergence-active herbicides lactofen, fomesafen, and acifluorfen were applied to established mat- ted-row strawberry plants (Fragaria × ananassa) and evaluated for broadleaf weed control and foliar phytotoxicity. Strawberries were evaluated for yield and fruit quality. Treatments were applied following June renovation. All herbicide treatments resulted in acceptable control of broadleaf weeds present at the time of application; however, sicklepod (Cassia obtusifolia) germinated after herbicide application. All treatments caused foliar injury within 3 days after application. No injury symptoms were evident 21 days after treatment due to new foliage development. Fomesafen and acifluorfen were the only herbicides to suppress runner count. Yields the following year were not reduced by herbicide treatments. Chemical names used: (±)-2-ethoxy-l-methy1-2-oxoethyl 5-(2-chloro-4-(trifluoromethyl) phen- oxy)-2-nitrobenzate (lactofen); 5-(2-chloro-4-(trifluoromethyl)phenoxy)- N -(methylsu1fonyl)-2-nitrobenzamide (fome- safen); 5-(2-chloro-4-(trifluoromethyl)phenoxy)-2-nitrobenzoic acid (acifluorfen). Most strawberries in Alabama are grown in a 3-year cycle using a matted-row system of culture (Patterson, 1988). Weeds are a major limiting factor in matted-row strawberry plantings, and their control represents one of the largest production input costs. Mechanical weed control becomes less effective as run- ners develop during the first growing season, and is impossible in the matted rows during the fruiting seasons (Collins and Ev- erett, 1965; Patterson, 1988). Currently, there are no herbicides registered for broadleaf weed control in strawberries after ren- ovation that follows harvest in late May and early June (Patter- son, 1988). Excellent control of a wide range of broadleaf weed species has been achieved with members of the diphenyl ether herbi- cides in agronomic crops (Beale et al., 1985; Else et al., 1987; Guy and Talbert, 1985; Harris et al., 1986; Little et al., 1984; Murphy and Morrow, 1985 Retzinger et al., 1986). These her- bicides have also shown potential for broadleaf weed control in strawberries (Agamalian, 1987; Brown et al., 1984; Guy and Talbert, 1985). Agamalian (1987) reported excellent selectivity with preplant application of acifluorfen on California strawberry cultivars. Our investigations were conducted to evaluate the effective- ness and selectivity of lactofen, fomesafen, and acifluorfen when applied postemergence for broadleaf weed control following postharvest renovation of matted-row strawberries.

Broadleaf Weed Control in Strawberries with Postemergence-applied Diphenyl Ether Herbicides