Wheat disappearing any ideas

[Birchfarmer]

Got a field of wheat on peaty sand,the sandy side of field is ok and headlands ,drilled 16/9
NO sign of slugs at all.
Getting eaten off at bottom,mainly cross drilling where stubble is more prevalent(Straw baled)
Looks like leatherjacket damage or wire worm damage,but can’t find any when I dug a hole dug.
Any ideas.? And potential cure.
Many thank in advance for reply’s