When i went to the Hampton Court Flower show i spoke to the roundup man about horse tail and he told me knock it about abit before spraying with roundup so that it gets into the plant. Having the same problem on my allotment i will try this next week. i have try spraying with roundup in the past and did not touch it.
Not sure if you still need to know but I have just taken an allotment on and it was completely covered with horsetail, I brought some kurtail after a lot of research treated it 3 days ago and it's about dead you could plainly see where I missed so I gave it another dose with the bits I missed. So I can whole heartedly reccomend kurtail for eradicating it however if it has totally taken hold like our allotment it will take 3 years approximately as some lay dormant each year and you need to wait fir it to start growing fully before kurtail actually works as when it touches soil it becomes inactive hope this helps
Ammonium Sulphamate (check it out on Wikipedia) can be purchased in granular form and mix 6 to 1 with water and spray. If it is just a few stems pushing through then nip off the end and put a small funnel over so as not to spray the soil. If its a large area then just overspray and dont grow anything else there for a while (i think its about 4 months) It definately kills horsetail and other tough weeds.
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When i went to the Hampton Court Flower show i spoke to the roundup man about horse tail and he told me knock it about abit before spraying with roundup so that it gets into the plant. Having the same problem on my allotment i will try this next week. i have try spraying with roundup in the past and did not touch it.
Ammonium Sulphamate (check it out on Wikipedia) can be purchased in granular form and mix 6 to 1 with water and spray. If it is just a few stems pushing through then nip off the end and put a small funnel over so as not to spray the soil. If its a large area then just overspray and dont grow anything else there for a while (i think its about 4 months) It definately kills horsetail and other tough weeds.