After these criteria are met, a successful field bioassay must be conducted before planting these crops. In other words, you must plant a test strip across the field of the crop in question to determine whether it is safe to plant the crop of your choice. The label states that a successful field bioassay be conducted. However, guidelines for soybeans and other sensitive crops indicate that at least 12 to 24 months needs to elapse before considering a field bioassay. The label guidelines indicate that a minimum of 15 months is required before growing canola, peas or lentils.
Rotational guidelines are more specific and vary by crop.
Canola can be grown after a minimum of 12 months following the application of Curtail. The rotational interval for peas and lentils is longer, requiring a minimum of 18 months after treatment unless risk of injury is acceptable. Here as well, the labeled rotational intervals for canola, peas and lentils are not specific, and require a successful bioassay. However, the guidelines for Washington and Oregon indicate that a minimum of 24 months is required before attempting to grow a successful bioassay for either peas or lentils. Similar guidelines probably would be appropriate for canola also.