I'm in Delvin - county Westmeath. Noticed the infestation about three/four years back on gravelled areas of yard. Assumed it was a slime mould - now I know! Worst affected areas are the lower, dampest areas.
[I'd wondered about RU as a herbicide on the gravelled areas - which is where the infection originated. Will have to get a replacement. I'll try Nat Ag Distributors for alternative herbicides]
Concentrated sulphuric acid wipes it out - but that's a bit dramatic. I shall experiment with dilute solutions and see what happens.
I am currently trying sodium hydroxide (caustic soda dry powder) on the worst affected areas. No firm results yet (only 7 days).
What I need to do is to set up some glass containers, add some damp sand to each, then innoculate the surface with some Nostoc. I'll then have to experiment with a selection of acid and alkali treatments to see what effect each will have.
Sodium bi-carbonate is a MILD alkali and when dissolved in water produces a pH of 8 - 9*
Sodium carbonate is a STRONG alkali and when dissolved in water produces a pH of 13. Hazardous; toxic; corrosive.
Bleach is solution of sodium hypochlorite - NaOCl - used in various formulations as a cleansing, disinfecting (mild oxidizing agent). Hazardous; toxic; corrosive.
Ehanoic (acetic) acid is a strong organic acid and rapidly penetrates and destroys living tissue. Hazardous; toxic; corrosive and flammable. Vapour is a strong irritant.
Sodium hydroxide is a strong alkali and reacts like acetic acid. Hazardous; toxic; corrosive.
Ammonia solutions (NH4OH - ammonium hydroxide) are often suggested for cleaning. Strong alkali. Hazardous; toxic; corrosive. Vapour is a strong irritant.
* Note; pH is an inverse logarithmic scale to measure the amount of hydrogen ion (acid) present in a solution. : 0 (zero) is very strong acid; 7 is Neutral; 14 is very strong alkali (absence of acid). Purified water should have a pH value of 6.8 or so.