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The phase out of methyl bromide (MBr) challenged vegetable growers’ abilities to control weeds in low-density polyethylene (LDPE) mulch production systems. The herbicides halosulfuron, fomesafen, S-metolachlor, and clomazone are needed as part of the pesti‐ cide program in LDPE vegetable production to control weeds including Cyperus species. Experiments were conducted during the spring and autumn of 2012, evaluating Cyperus rotundus, bell pepper, and cucumber response to these herbicides applied to soil immedi‐ ately prior to LDPE laying. Halosulfuron, fomesafen, S-metolachlor, and clomazone ap‐ plied to soil under LDPE mulch did not negatively impact stand and growth of bell pepper in spring or autumn experiments, or cucumber in spring trials. However, there was significantly less growth in the autumn experiment as halosulfuron, S-metolachlor plus clomazone plus halosulfuron or fomesafen, reduced vine length. Cyperus rotundus suppression and control was achieved with halosulfuron alone and when used in combi‐ nations with S-metolachlor plus clomazone, and combinations of S-metolachlor plus clo‐ mazone plus fomesafen. These herbicides provided weed control that were comparable to MBr plus chloropicrin (MBrR-C). Using herbicides for control and suppression of Cype‐ rus rotundus in combination with safety for pepper and cucumber will allow growers to implement new control strategies into their vegetable production systems.

Evaluation of Non-fumigant Pesticides as Methyl Bromide Alternatives for Managing Weeds in Vegetables