Forum home Problem solving

Slimy Fungus on gravel



  • We live in Kentucky and have a terrible problem with this green slime.

    We bought 100 lbs of soda ash to dissolve in water and spray on our driveway.  My question should we apply when nostoc is active or inactive?  (Hope this works)

    Also, what would you recommend to spray on the driveway in the future to prevent weeds and grass? I also used Round up in the past.

  • Gisela2Gisela2 Posts: 4

    I am in Danville KY, it's just terrible need help desperately

  • Follow up:

    We sprayed our driveway with soda ash.  We mixed up 25 pounds of soda ash with water to make a 25 gallon mix in our yard sprayer.  We had to do the mixes in small amounts to assure the ash was dissolved in hot water. Since our driveway is over 300 feet long we used  50 pounds.  After a week or so it rained.  We noticed it worked pretty good.  We repeated the process again with another 50 pounds, when we knew it was not going to rain for at least three days.  It rained again the day before yesturday.  We still have some slim left but I say we got rid of over 90% of it.

     This morning I went out and sprinkled about 30 lbs. of baking soda on the spots we had left . (I had tried the baking soda with a outdated box I had in my cabinet prior to the soda ash in a small area.  Put it on real heavy and it did work.  It has been several weeks and it still has not returned.)

    Last note.  When you spray do it when the slim is active.

  • Thank you thank you Margaret Ibbs.  We drank a toast to you last night.  I used your suggested sodium carbonate solution last Friday on the horrendous nostoc commune growing on my gravel drive, and today, Monday, it looks totally dead.  I shall re-treat in a fortnight as you suggest, and hope to see the last of it for ever.  (Downside - no more glyphosate on the drive weeds, since several posts suggest this could be causing the problem.  However hand-weeding will be a small price to pay to be rid of this monster.)

  • I have joined this debate because I have NOSTOC too. It is growing within the clumps of alpine plants which prefer a well-drained soil (so perhaps I haven't got that right!), - I am in one of the drier parts of Wales. This means that drastic treatments (fire, for instance) are ruled out. If I 'caught' the nostoc, it may have arrived in a bought plant or two.

    The recurrence of 'after Round-up' in your comments hints that perhaps there is a link. I wonder if Round-up kills something which otherwise would live off, or combat, the Nostoc? I mention this as while a link with Round-up may be proven (eventually) it does not mean that Round-up is the cause. Neither does it prove it isn't.

    Next I will try Washing Soda (= sodium carbonate). This is a close chemical relative of baking soda, but cheaper. It does not have the formula quoted earlier (NaCa3) as I think this is a mis-keying. If you heat baking soda (sodium bicarbonate) it gives off carbon dioxide and turns into sodium carbonate. Leave this around and it will absorb some carbon dioxide from the air and turn into baking soda. Not completely, but this is to show how closely the two are linked as chemicals. And if the weather has done with being dry for this year, the glass sheet is going over the raised beds next weekend, until the daffodils are out again.

    Keep in touch, I am interested in your soda results.

  • plant pauperplant pauper Posts: 6,234

    I rushed out after reading that  post and sprayed mine. I'm due to do a second dose next Monday so I'll report back when I have some results, +ve or -ve. image

  • Birdy13Birdy13 Posts: 595

    You're right bobweight - some time ago I did mis-key the formula of sodium carbonate. Wikipedia confirms the formula as Na2CO3.

    Wikipedia also describes sodium carbonate as the water-soluble sodium salt of carbonic acid. I wonder whether its application to the Nostoc in some way re-creates or releases the carbonic acid constituent which in turn destroys the dreaded stuff. (Fortunately) my gravel does not have the problem so (unfortunately) I can't put this to the test myself.

  • image

    London Kentucky here...we have this crud EVERYWHERE & have had it for years!  This is the first time I've tried to research what it was since none of my family, who live within a rock's-throw of us have it.  

    Its in the gravel & yard but never had it on our sidewalks or patio, thank God!  We will try some of this stuff to get rid of it.  But is there a consensus on what it is?? Fungus, mold, alien poop???  Argh!! 

    Appreciate all the info!!

  • plant pauperplant pauper Posts: 6,234

    Here you go geannie. Fill your boots. image

  • I have battled this for years. However, This year I tried Pool Algae Cleaner. You can buy by the Gallon at Walmart ,etc  It is only about $7-8 a gallon. I waited for a rain and then as it started to dry out but still damp (12-24 hrs later ) I sprayed on through a garden sprayer. It turns a slight brown almost immeadiately and Within a few days you can really notice it dying out. You may need to treat a few times but at the low cost of treatment  it was well worth it. Good Luck!

Sign In or Register to comment.