Weedkilling on the St Olaf Greens

Today we have applied weedkiller to the St Olaf greens the target weed is Pearlwort , which will require a follow up spray and overseeding to fill in the gaps. The greens won't look great for a while when the chemical starts work but intensive overseeding will help fill and close in the gaps .It is very hard to see the weed in pictures as it's green and blends in with the sward to the untrained eye !!!