Is my horse manure contaminated with aminopyralid?

Curling affecting the tops of potato plants

For the last few months I’ve been composting with horse manure I got from Ealing Riding School. I thought it would be an ideal organic boost to the very poor soil in my garden. Now the tops of my potatoes plants are curling. Some mentioned a virus but further research suggests it may be a persistent hormonal weed killer containing aminopyralid used by farmers on grassland to suppress broad leaved plants and manufactured by Dow Chemicals. The fodder in the fields absorbs the chemical and is cut and sold as feed to farms and stables. Apparently allotments have been affected as far back as 2008. There are a few articles out there on this including one from the Royal Horticultural Society. Here’s a good article that’s more recent,  https://nodighome.com/2019/06/13/aminopyralid-we-need-to-stop-this/ . I tried the test of growing tomato seedlings in it and they wilted and died after a few days. If that’s what’s causing this (a) why is this still going on, and (b) I doubt my family will be eating anything from that patch this year. It apparently takes at least a year for bacteria to reduce the soil content and no one can confirm it’s safe to eat. Gutted.

Curling affecting the tops of potato plants
Curling affecting the tops of potato plants
Curling affecting the tops of potato plants

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