Zidua PRO herbicide offers soybean growers another option for 2017 - BASF The product helps provide residual control up to 14 days longer than competitive group 15 herbicides when applied at full rate. Longer residual control means more time to make post-emergent applications, helping growers spray when weeds are less than four inches tall. Zidua PRO herbicide enters the market during a critical time for soybean growers.