Survey 4 weeks after planting but before cultivation to determine the spectrum of weeds present. Depending on the planting date and your location, it is possible that you will see winter annuals along with summer annuals.
The most problematic weeds in bean fields are bermudgrass, johnsongrass, nutsedge, and field bindweed. Weed control can also be difficult in fields heavily infested with certain annual weeds such as nightshade, groundcherry, and annual morningglory.
Recording weed survey results assists in weed management decisions, including herbicide choice and cultivation practices. Records from previous crops are also helpful to indicate which weeds may be in the seed bank and require control. Information collected over a period of years tells you how weed populations are changing and how effective your management operations have been.
How to survey
PDF: To display a PDF document, you may need to use a PDF reader.