... Biology and Management, ” Chapter 13.4.18. in the Waterfowl Management Handbook). Undesirable Plant Control In “Preliminary Considerations for Manipulating Vegetation” (Waterfowl Management ... farther north in the flyway may want to delay late season management actions (e.g., drawdowns) until March or April. Moist-Soil Management Guidelines for the U.S. Fish and Wildlife Service ... samples of vegetation to determine if management objectives (e.g., 400 pounds of seed per acre) are being met, monitor plant response (spring, summer, and fall) to management actions, identify plant...