To confirm that the seed is below 30%, check a total of 40 seeds from four points in the field, at least 24 should match the colour range below, the rest should be a shade of green. If they do not then the crop is NOT ready for spraying. Check after 3-5 days.
A minimum statutory harvest interval of 14 days must be observed, however an interval of 21-28 days may be required before combine harvesting.
Linseed grown for oil production should be desiccated at the brown capsule stage. Seeds are light brown and rubbery, lower leaves are withered but the upper leaves and stem are still green/yellow. Confirm by sampling 40 seeds from four points in the field and at least 24 should be in the orange/brown, beige/brown colour range, (similar to a milky cup of tea). Seeds are initially white to light green, (too early) and end up dark brown, (too late).
Timing is the same as Linseed with regard to crop growth stage and capsule colour. However, the seed is only a light brown or yellow colour even when ripe. Caution is needed to match the correct growth stage. Seed colour starts off as green then turns white and finally light yellow. So optimum timing is when seed colour is white, not light brown as for linseed.