Weeds compete directly with crops for light, nutrients, and moisture and can cause significant economic loss. Most modern weed control technologies are developed for use in high-value agronomic crops and do not necessarily lend themselves to adoption in minor crops, such as vegetables. The limited number and low efficacy of weed control tools available to vegetable growers demand creativity and resourcefulness in developing successful weed control programs. This research examines several recently labeled onion herbicides as well as new, safer formulations of existing chemistries. The studies conducted intend to improve our understanding of the effects of these compounds under various application regimes, as they relate to weed control efficacy and onion phytotoxicity and yield. This research also examines the feasibility of using machine-vision guidance for postemergence weed control tool in vegetable crops. By combining a tractor-mounted, shielded weed flamer/sprayer with a camera and computer guidance system, it appears possible to control weeds while reducing the input of residual chemicals.
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