For option 4, unsprayed root or forage crop, on 15 October (whole field) and on 15 February (ungrazed field margin).
Ar gyfer opsiwn 4 – gwreiddgnwd neu gnwd pori heb ei chwistrellu – ar 15 Hydref (cae cyfan) neu ar 15 Chwefror (ymyl cae heb ei bori).