Potato issue

[Toylexus]

Put in a small plot each year but this year half the leaves are curled but other half is normal.
I'd put manure on the ground where the leaf curling has taken place but not where there normal.
Could it be frost? The odd one is fine among the curled ones

 

[Lincs Lass]

frost damage would be black and there hasnt been any frosts for a couple of weeks ,,chemical residue in the manure ?

 

[Toylexus]

They did see a few frosts but no blackness. Could be chemical

 

[melted welly]

I think thats aminopyralid residue caused that. It’s a herbicide and could of come in on the straw. If you google, you’ll find pics.

 

[Lincs Lass]

If it was frost ,,both plots would be affected .

 

[Toylexus]

Thanks all. Your definitely right melted welly. Pictures are exactly right. You learn something new everyday.
That manure is 3 yr old and been lying outside

 

[Boohoo]

It's not frost damage, as said it would be black. Had similar damage a few years ago after importing manure and put it down to herbicide damage, likely Forefront.
There's another thread running on the same subject

whats done this to spuds

interesting photo on local faceache of some ones spuds....2 yr old pig muck used

thefarmingforum.co.uk

 

[Bogweevil]

Aminopyralid only breaks down in the soil not in stacked manure, hence why treated grass should only be grazed not conserved.

Plants often recover in time and the residues are not considered harmful to human health.

If in doubt over manure mix some with potting compost and sow with broad beans. If beans don't emerge or are distorted use shyte on your cabbage patch, brassica crops unaffected.

 

[woodylane]

Put in a small plot each year but this year half the leaves are curled but other half is normal.
I'd put manure on the ground where the leaf curling has taken place but not where there normal.
Could it be frost? The odd one is fine among the curled ones

Definitely damage from aminopyralid or clopyralid.