I suspect leather jacket but unsure of how many I should be finding to prove it's them. Water logging is bad but can't understand why in these patches unless it's just because their is no grass. But these dead patches are teeming with worms! I am finding the odd leather jacket too though.
In this field there is another patch same size in opposite side then a few smaller patches in the next field too.
Hope the video works.
Anyone any ideas?