Application: Penoxsulam SC herbicide is a postflood, postemergence herbicide for selective control of susceptible grass, broadleaf, and sedge weeds in rice. Susceptible weeds emerged at the time of application will be controlled. A spray volume of 10 gallons per acre (gpa) or more and uniform coverage are required for optimum performance. A crop oil concentrate at 2.5% v/v, or a methylated seed oil or vegetable oil concentrate at recommended label use rates, are required with Penoxsulam SC. Penoxsulam SC is rainfast within 1 hour after application. Penoxsulam SC can be applied to rice fields used for crayfish production.
Application Instructions: Environmental Conditions and Herbicidal Activity of Penoxsulam SC. Best weed control results are obtained when Penoxsulam SC is applied to small, actively growing weeds, when daytime and nighttime temperatures are warm (60°F or more), and soil moisture is adequate to support active weed growth prior to and following application. If weeds are under drought stress, delay applications until more favorable conditions resume. Application when weeds are moisture stressed or taller than the recommended size for control may result in only partial control. Application Timing: For water-seeded and drill-seeded rice, apply Penoxsulam SC from the 1 leaf stage up to 60 days before harvest. Within this application window, application timing is dependent upon cultural practices and optimum timing for weed species present. (See Application Rates and Weeds Controlled table.) Do not apply if crop or weeds are under drought stress. A single postflood application is recommended.